$NWE
NorthWestern Energy Group, Inc. Stock $nwe

$nwe Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000199300424000006 Filed on February 15, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$475.3M	$356.0M	$1.422B
YoY Change	4.59%	-16.29%	-3.77%
Cost Of Revenue	$174.7M	$98.20M	$420.2M
YoY Change	5.57%	-35.82%	-14.59%
Gross Profit	$300.6M	$257.8M	$1.002B
YoY Change	4.02%	-5.33%	1.63%
Gross Profit Margin	63.24%	72.41%	70.45%
Selling, General & Admin	$40.45M	$23.20M	$117.3M
YoY Change	16.56%	-13.43%	3.08%
% of Gross Profit	13.45%	9.0%	11.71%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$56.74M	$52.70M	$210.5M
YoY Change	6.66%	6.9%	7.94%
% of Gross Profit	18.88%	20.44%	21.01%
Operating Expenses	$198.5M	$154.6M	$701.4M
YoY Change	2.87%	-18.24%	-2.96%
Operating Profit	$102.1M	$103.2M	$300.5M
YoY Change	6.33%	23.99%	14.24%
Interest Expense	-$30.98M	-$29.50M	-$114.6M
YoY Change	10.64%	9.26%	14.49%
% of Operating Profit	-30.35%	-28.6%	-38.14%
Other Income/Expense, Net	$6.819M	$2.800M	$15.83M
YoY Change	45.09%	-63.16%	-18.39%
Pretax Income	$75.42M	$76.50M	$201.7M
YoY Change	3.6%	19.91%	10.56%
Income Tax	$10.33M	-$6.600M	$7.539M
% Of Pretax Income	13.7%	-8.63%	3.74%
Net Earnings	$65.09M	$83.14M	$194.1M
YoY Change	4.14%	24.65%	6.08%
Net Earnings / Revenue	13.69%	23.35%	13.65%
Basic Earnings Per Share	$1.06	$1.37	$3.22
Diluted Earnings Per Share	$1.06	$1.37	$3.22
COMMON SHARES
Basic Shares Outstanding	61.26M shares	61.24M shares	60.32M shares
Diluted Shares Outstanding	61.31M shares		60.36M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.150M	$9.164M	$9.164M
YoY Change	-61.21%	7.81%	7.81%
Cash & Equivalents	$4.150M	$9.164M	$9.164M
Short-Term Investments
Other Short-Term Assets	$101.9M	$25.40M	$71.05M
YoY Change	-19.31%	-9.43%	-60.09%
Inventory	$103.8M	$114.5M	$114.5M
Prepaid Expenses
Receivables	$186.9M	$212.3M	$212.3M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$396.8M	$407.0M	$407.0M
YoY Change	-11.48%	-24.46%	-24.46%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.087B	$6.040B	$6.040B
YoY Change	6.73%	6.76%	6.76%
Goodwill	$357.6M	$357.6M
YoY Change		0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$792.4M	$52.31M	$796.3M
YoY Change	2.59%	10.55%	4.24%
Total Long-Term Assets	$7.237B	$7.194B	$7.194B
YoY Change	5.91%	6.12%	6.12%
TOTAL ASSETS
Total Short-Term Assets	$396.8M	$407.0M	$407.0M
Total Long-Term Assets	$7.237B	$7.194B	$7.194B
Total Assets	$7.633B	$7.601B	$7.601B
YoY Change	4.84%	3.87%	3.87%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$96.54M	$124.3M	$124.3M
YoY Change	-7.88%	-38.29%	-38.29%
Accrued Expenses	$298.3M	$246.2M	$218.5M
YoY Change	-3.34%	-1.76%	-2.62%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$99.95M	$0.00
YoY Change
Long-Term Debt Due	$3.400M	$99.95M	$103.3M
YoY Change	-98.63%	-30.84%	-30.02%
Total Short-Term Liabilities	$444.7M	$534.9M	$534.9M
YoY Change	-34.67%	-13.84%	-13.84%
LONG-TERM LIABILITIES
Long-Term Debt	$2.772B	$2.685B	$2.690B
YoY Change	18.02%	8.5%	8.33%
Other Long-Term Liabilities	$984.3M	$332.4M	$989.8M
YoY Change	-3.25%	-6.48%	-1.96%
Total Long-Term Liabilities	$3.756B	$3.017B	$3.680B
YoY Change	11.59%	6.62%	5.36%
TOTAL LIABILITIES
Total Short-Term Liabilities	$444.7M	$534.9M	$534.9M
Total Long-Term Liabilities	$3.756B	$3.017B	$3.680B
Total Liabilities	$4.820B	$4.815B	$4.815B
YoY Change	5.07%	3.5%	3.5%
SHAREHOLDERS EQUITY
Retained Earnings	$837.0M	$811.5M
YoY Change		5.2%
Common Stock	$648.0K	$648.0K
YoY Change		2.37%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$97.99M	$97.93M
YoY Change		-0.47%
Treasury Stock Shares
Shareholders Equity	$2.813B	$2.785B	$2.785B
YoY Change
Total Liabilities & Shareholders Equity	$7.633B	$7.601B	$7.601B
YoY Change	4.84%	3.87%	3.87%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$65.09M	$83.14M	$194.1M
YoY Change	4.14%	24.65%	6.08%
Depreciation, Depletion And Amortization	$56.74M	$52.70M	$210.5M
YoY Change	6.66%	6.9%	7.94%
Cash From Operating Activities	$161.7M	$62.33M	$489.2M
YoY Change	-24.34%	-3068.14%	59.25%
INVESTING ACTIVITIES
Capital Expenditures	$108.8M	$159.7M	$566.9M
YoY Change	-20.39%	23.98%	10.05%
Acquisitions
YoY Change
Other Investing Activities	-$242.0K	-$123.0K	-$3.923M
YoY Change		-84.62%	130.76%
Cash From Investing Activities	-$109.0M	-$159.8M	-$570.8M
YoY Change	-20.21%	23.31%	10.43%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$73.61M
YoY Change			-73.48%
Debt Paid & Issued, Net	$100.0M
YoY Change
Cash From Financing Activities	-57.49M	101.1M	$84.31M
YoY Change	-20.71%	-19.37%	-60.48%
NET CHANGE
Cash From Operating Activities	161.7M	62.33M	$489.2M
Cash From Investing Activities	-109.0M	-159.8M	-$570.8M
Cash From Financing Activities	-57.49M	101.1M	$84.31M
Net Change In Cash	-4.805M	3.624M	$2.724M
YoY Change	-204.46%	-157.52%	-24.33%
FREE CASH FLOW
Cash From Operating Activities	$161.7M	$62.33M	$489.2M
Capital Expenditures	$108.8M	$159.7M	$566.9M
Free Cash Flow	$52.92M	-$97.36M	-$77.66M
YoY Change	-31.36%	-25.62%	-62.65%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	151000000	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001993004
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	63278307	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	59744130	shares
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2022Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2021	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	208303000	usd
CY2022	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	221427000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.56
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.52
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.48
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentNet
CY2023Q4	nweg	Physical Purchase And Sale Of Gas And Electricity At Fixed Prices PhysicalPurchaseAndSaleOfGasAndElectricityAtFixedPrices	0	usd
CY2022Q4	nweg	Physical Purchase And Sale Of Gas And Electricity At Fixed Prices PhysicalPurchaseAndSaleOfGasAndElectricityAtFixedPrices	0	usd
CY2023Q4	us-gaap	Interest Rate Cash Flow Hedge Derivative At Fair Value Net InterestRateCashFlowHedgeDerivativeAtFairValueNet	0	usd
CY2022Q4	us-gaap	Interest Rate Cash Flow Hedge Derivative At Fair Value Net InterestRateCashFlowHedgeDerivativeAtFairValueNet	0	usd
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Net FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet	0	usd
CY2022	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Net FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet	0	usd
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.304
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.410
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.282
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.385
CY2023Q4	us-gaap	Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrent
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	93-2020320
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	3010 W. 69th Street
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Sioux Falls
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	SD
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	57108
CY2023	dei	City Area Code CityAreaCode	605
CY2023	dei	Local Phone Number LocalPhoneNumber	978-2900
CY2023	dei	Security12b Title Security12bTitle	Common stock
CY2023	dei	Trading Symbol TradingSymbol	NWE
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	3404946692	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	61256549	shares
CY2023	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023	dei	Auditor Name AuditorName	Deloitte & Touche LLP
CY2023	dei	Auditor Firm AuditorFirmId	34
CY2023	dei	Auditor Location AuditorLocation	Minneapolis, Minnesota
CY2023	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	1068833000	usd
CY2022	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	1106565000	usd
CY2021	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	1052182000	usd
CY2023	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	353310000	usd
CY2022	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	371272000	usd
CY2021	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	320134000	usd
CY2023	us-gaap	Revenues Revenues	1422143000	usd
CY2022	us-gaap	Revenues Revenues	1477837000	usd
CY2021	us-gaap	Revenues Revenues	1372316000	usd
CY2023	nweg	Utility Operating Expense Fuel Purchased Supply And Direct Transmission Expense UtilityOperatingExpenseFuelPurchasedSupplyAndDirectTransmissionExpense	420262000	usd
CY2022	nweg	Utility Operating Expense Fuel Purchased Supply And Direct Transmission Expense UtilityOperatingExpenseFuelPurchasedSupplyAndDirectTransmissionExpense	492011000	usd
CY2021	nweg	Utility Operating Expense Fuel Purchased Supply And Direct Transmission Expense UtilityOperatingExpenseFuelPurchasedSupplyAndDirectTransmissionExpense	425548000	usd
CY2023	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	220524000	usd
CY2023	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	117360000	usd
CY2022	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	113776000	usd
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	101873000	usd
CY2023	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	153068000	usd
CY2022	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	192524000	usd
CY2021	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	173444000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	187467000	usd
CY2023	us-gaap	Interest And Debt Expense InterestAndDebtExpense	114617000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	15832000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	19434000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	201670000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	182403000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	190259000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7539000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-605000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3419000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	194131000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	183008000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	186840000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60321000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55769000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	51709000	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.22
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.28
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.61
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.22
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.25
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.60
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	us-gaap	Net Income Loss NetIncomeLoss	194131000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	183008000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	186840000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	262000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	982000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	436000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-8000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-57000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	192000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-538000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-41000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	194323000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	182470000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	186799000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9164000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8489000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	16023000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	13974000	usd
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	212257000	usd
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	244952000	usd
CY2023Q4	us-gaap	Inventory Net InventoryNet	114539000	usd
CY2022Q4	us-gaap	Inventory Net InventoryNet	107359000	usd
CY2023Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	29626000	usd
CY2022Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	136009000	usd
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	25397000	usd
CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	28041000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	407006000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	538824000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6039801000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5657480000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	357586000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	357586000	usd
CY2023Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	743945000	usd
CY2022Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	716570000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	52314000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	47323000	usd
CY2023Q4	us-gaap	Assets Assets	7600652000	usd
CY2022Q4	us-gaap	Assets Assets	7317783000	usd
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3338000	usd
CY2022Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3098000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	99950000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	144525000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	124340000	usd
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	201498000	usd
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	246167000	usd
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	250579000	usd
CY2023Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	61103000	usd
CY2022Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	21145000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	534898000	usd
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	620845000	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	5461000	usd
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	8799000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2684635000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2474357000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	600520000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	538983000	usd
CY2023Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	657452000	usd
CY2022Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	654213000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	332372000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	355403000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	4815338000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	4652600000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	64761919	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	61248800	shares
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	648000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	633000	usd
CY2023Q4	us-gaap	Treasury Stock Value TreasuryStockValue	97926000	usd
CY2022Q4	us-gaap	Treasury Stock Value TreasuryStockValue	98392000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	2078753000	usd
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1999376000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	811495000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	771414000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7656000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7848000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	2785314000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	2665183000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7600652000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7317783000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	194131000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	183008000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	186840000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	210474000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	195020000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	187467000	usd
CY2023	nweg	Amortization Of Debt Issue Costs And Discount And Deferred Hedge Gain AmortizationOfDebtIssueCostsAndDiscountAndDeferredHedgeGain	5142000	usd
CY2022	nweg	Amortization Of Debt Issue Costs And Discount And Deferred Hedge Gain AmortizationOfDebtIssueCostsAndDiscountAndDeferredHedgeGain	5321000	usd
CY2021	nweg	Amortization Of Debt Issue Costs And Discount And Deferred Hedge Gain AmortizationOfDebtIssueCostsAndDiscountAndDeferredHedgeGain	5250000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	5176000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	5488000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	5350000	usd
CY2023	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	17614000	usd
CY2022	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	14191000	usd
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	11092000	usd
CY2023	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-316000	usd
CY2022	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-482000	usd
CY2021	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	47000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	6584000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-8992000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	525000	usd
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-32695000	usd
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	46282000	usd
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	30442000	usd
CY2023	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	7180000	usd
CY2022	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	26744000	usd
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	19604000	usd
CY2023	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-2644000	usd
CY2022	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	3833000	usd
CY2023	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-54722000	usd
CY2021	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	26055000	usd
CY2022	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	20512000	usd
CY2021	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	69616000	usd
CY2023	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	39957000	usd
CY2022	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-7034000	usd
CY2021	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-27674000	usd
CY2023	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	30583000	usd
CY2022	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	21872000	usd
CY2021	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	33693000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	489231000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	307242000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	219978000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	566889000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	515140000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	434328000	usd
CY2023	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	3923000	usd
CY2022	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1719000	usd
CY2021	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1505000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-570812000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-516859000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-435833000	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	154050000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	140062000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	128483000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	73613000	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	276971000	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	196246000	usd
CY2023	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	300000000	usd
CY2022	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	usd
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	99915000	usd
CY2023	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	usd
CY2022	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	usd
CY2021	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	955000	usd
CY2023	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-132000000	usd
CY2022	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	77000000	usd
CY2023	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	0	usd
CY2022	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	0	usd
CY2021	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	-100000000	usd
CY2023	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	1069000	usd
CY2022	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	603000	usd
CY2021	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	707000	usd
CY2023	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4327000	usd
CY2022	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1194000	usd
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	909000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	84305000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	213318000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	217521000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	2724000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	3701000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	1666000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22463000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18762000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	17096000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	25187000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22463000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18762000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2079095000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	186840000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-57000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	436000	usd
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4328000	usd
CY2021	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	29000	shares
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	197974000	usd
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.48
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	128483000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	2339713000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	183008000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-8000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	982000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	6480000	usd
CY2022	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	28000	shares
CY2022	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	276582000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.52
CY2022	us-gaap	Dividends Common Stock DividendsCommonStock	140062000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	2665183000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	194131000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	262000	usd
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4954000	usd
CY2023	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	21000	shares
CY2023	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	74904000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.56
CY2023	us-gaap	Dividends Common Stock DividendsCommonStock	154050000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	2785314000	usd
CY2023Q4	nweg	Number Of Customers NumberOfCustomers	775300	customers
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-indent:18pt"><span style="color:#b90101;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;text-decoration:underline">Use of Estimates</span></div><div><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Estimates are used for such items as long-lived asset values and impairment charges, long-lived asset useful lives, tax provisions, uncertain tax position reserves, AROs, regulatory assets and liabilities, allowances for uncollectible accounts, our QF liability, environmental liabilities, unbilled revenues and actuarially determined benefit costs and liabilities. We revise the recorded estimates when we receive better information or when we can determine actual amounts. Those revisions can affect operating results.</span></div>
CY2023	nweg	Number Of Months Or Less Of Maturity To Be Considered Cash Equivalent NumberOfMonthsOrLessOfMaturityToBeConsideredCashEquivalent	3	months
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9164000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8489000	usd
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2820000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2800000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2500000	usd
CY2023Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	105100000	usd
CY2022Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	117400000	usd
CY2023Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	85876000	usd
CY2022Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	71769000	usd
CY2023Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	28663000	usd
CY2022Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	35590000	usd
CY2023Q4	us-gaap	Inventory Net InventoryNet	114539000	usd
CY2022Q4	us-gaap	Inventory Net InventoryNet	107359000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-827000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4707000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4330000	usd
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	24300000	usd
CY2022	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	20200000	usd
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	15900000	usd
CY2023	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.028
CY2022	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.028
CY2021	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.028
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	79252000	usd
CY2022Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	96093000	usd
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	41773000	usd
CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	44104000	usd
CY2023Q4	us-gaap	Customer Refund Liability Current CustomerRefundLiabilityCurrent	27656000	usd
CY2022Q4	us-gaap	Customer Refund Liability Current CustomerRefundLiabilityCurrent	26137000	usd
CY2023Q4	us-gaap	Interest Payable Current InterestPayableCurrent	24775000	usd
CY2022Q4	us-gaap	Interest Payable Current InterestPayableCurrent	18350000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	72711000	usd
CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	65895000	usd
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	246167000	usd
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	250579000	usd
CY2023	us-gaap	Interest Paid InterestPaid	105238000	usd
CY2022	us-gaap	Interest Paid InterestPaid	95400000	usd
CY2021	us-gaap	Interest Paid InterestPaid	87221000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	42322000	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	64758000	usd
CY2023Q4	nweg	Customer Advances CustomerAdvances	107470000	usd
CY2022Q4	nweg	Customer Advances CustomerAdvances	95393000	usd
CY2023Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	75302000	usd
CY2022Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	84731000	usd
CY2023Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	39255000	usd
CY2022Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	39096000	usd
CY2023Q4	nweg	Qualifying Facility Liability QualifyingFacilityLiability	28670000	usd
CY2022Q4	nweg	Qualifying Facility Liability QualifyingFacilityLiability	49728000	usd
CY2023Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	21135000	usd
CY2022Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	22662000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	60540000	usd
CY2022Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	63793000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	332372000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	355403000	usd
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	29034000	usd
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	16023000	usd
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	13974000	usd
CY2021Q4	us-gaap	Restricted Cash RestrictedCash	15942000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	25187000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22463000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18762000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	8299873000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	7843783000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1930688000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1880265000	usd
CY2023Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	6039801000	usd
CY2022Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	5657480000	usd
CY2023Q4	nweg	Number Of Joint Ownership Interest Electric Generating Plants NumberOfJointOwnershipInterestElectricGeneratingPlants	4	plants
CY2023	us-gaap	Asset Acquisition Price Of Acquisition Expected AssetAcquisitionPriceOfAcquisitionExpected	0	usd
CY2023Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	600000	usd
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	40894000	usd
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	40631000	usd
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	45355000	usd
CY2023	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1899000	usd
CY2022	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1853000	usd
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2233000	usd
CY2023	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	usd
CY2022	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	usd
CY2021	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	usd
CY2023	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1244000	usd
CY2022	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	4004000	usd
CY2021	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	2906000	usd
CY2023	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-125000	usd
CY2022	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	2414000	usd
CY2021	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-4051000	usd
CY2023Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	41424000	usd
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	40894000	usd
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	40631000	usd
CY2023	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1200000	usd
CY2023	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-100000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	357586000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	357586000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	2784585000	usd
CY2023Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	2521030000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	2618882000	usd
CY2022Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	2316700000	usd
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	550000000.0	usd
CY2022Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	550000000.0	usd
CY2023Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	0	usd
CY2022Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	0	usd
CY2023Q4	nweg	Credit Facility Borrowingsand Letterof Credit Amount Outstanding CreditFacilityBorrowingsandLetterofCreditAmountOutstanding	318000000.0	usd
CY2022Q4	nweg	Credit Facility Borrowingsand Letterof Credit Amount Outstanding CreditFacilityBorrowingsandLetterofCreditAmountOutstanding	450000000.0	usd
CY2023Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	232000000.0	usd
CY2022Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	100000000.0	usd
CY2023	nweg	Maximum Ratio Of Indebtedness To Net Capital Threshold Percentage MaximumRatioOfIndebtednessToNetCapitalThresholdPercentage	0.65
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	2784585000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	2618882000	usd
CY2023Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	99950000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	144525000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2684635000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2474357000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	8799000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	11897000	usd
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3338000	usd
CY2022Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3098000	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	5461000	usd
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	8799000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	103300000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	303600000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	106900000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	497700000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2925000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	5024000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	722000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2929000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-5993000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2626000	usd
CY2023	us-gaap	Other Tax Expense Benefit OtherTaxExpenseBenefit	-129000	usd
CY2022	us-gaap	Other Tax Expense Benefit OtherTaxExpenseBenefit	-130000	usd
CY2021	us-gaap	Other Tax Expense Benefit OtherTaxExpenseBenefit	-130000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-1971000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3363000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2172000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3785000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2869000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1971000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-605000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3419000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.003
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.003
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.001
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0.129
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0.124
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0.115
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.051
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.072
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.061
CY2023	nweg	Effective Income Tax Rate Reconciliation Unregulated Tax Cuts And Jobs Act Excess Deferred Income Taxes Percent EffectiveIncomeTaxRateReconciliationUnregulatedTaxCutsAndJobsActExcessDeferredIncomeTaxesPercent	-0.017
CY2022	nweg	Effective Income Tax Rate Reconciliation Unregulated Tax Cuts And Jobs Act Excess Deferred Income Taxes Percent EffectiveIncomeTaxRateReconciliationUnregulatedTaxCutsAndJobsActExcessDeferredIncomeTaxesPercent	0
CY2021	nweg	Effective Income Tax Rate Reconciliation Unregulated Tax Cuts And Jobs Act Excess Deferred Income Taxes Percent EffectiveIncomeTaxRateReconciliationUnregulatedTaxCutsAndJobsActExcessDeferredIncomeTaxesPercent	0
CY2023	nweg	Effective Income Tax Rate Reconciliation Unrecognized Tax Benefits Percent EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefitsPercent	-0.016
CY2022	nweg	Effective Income Tax Rate Reconciliation Unrecognized Tax Benefits Percent EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefitsPercent	0
CY2022	nweg	Effective Income Tax Rate Reconciliation Unrecognized Tax Benefits Percent EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefitsPercent	0
CY2023	nweg	Effective Income Tax Rate Reconciliation Amortizationof Excess Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationAmortizationofExcessDeferredTaxesPercent	0.011
CY2022	nweg	Effective Income Tax Rate Reconciliation Amortizationof Excess Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationAmortizationofExcessDeferredTaxesPercent	0.009
CY2021	nweg	Effective Income Tax Rate Reconciliation Amortizationof Excess Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationAmortizationofExcessDeferredTaxesPercent	0.003
CY2023	nweg	Income Tax Reconciliation Accelerated Tax Depreciation Flow Through Adjustment IncomeTaxReconciliationAcceleratedTaxDepreciationFlowThroughAdjustment	-0.033
CY2022	nweg	Income Tax Reconciliation Accelerated Tax Depreciation Flow Through Adjustment IncomeTaxReconciliationAcceleratedTaxDepreciationFlowThroughAdjustment	0.001
CY2021	nweg	Income Tax Reconciliation Accelerated Tax Depreciation Flow Through Adjustment IncomeTaxReconciliationAcceleratedTaxDepreciationFlowThroughAdjustment	0.006
CY2023	nweg	Reduction To Previously Claimed Alternative Minimum Tax Credit Percent ReductionToPreviouslyClaimedAlternativeMinimumTaxCreditPercent	0.016
CY2022	nweg	Reduction To Previously Claimed Alternative Minimum Tax Credit Percent ReductionToPreviouslyClaimedAlternativeMinimumTaxCreditPercent	0
CY2022	nweg	Reduction To Previously Claimed Alternative Minimum Tax Credit Percent ReductionToPreviouslyClaimedAlternativeMinimumTaxCreditPercent	0
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.000
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.008
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.000
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.002
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.008
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.037
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.003
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.018
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	201670000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	182403000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	190259000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	42350000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	38304000	usd
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	39954000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	606000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	562000	usd
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	354000	usd
CY2023	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	25922000	usd
CY2022	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	22665000	usd
CY2021	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	21888000	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	10274000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	13166000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	11532000	usd
CY2023	nweg	Effective Income Tax Rate Reconciliation Unregulated Tax Cuts And Jobs Act Excess Deferred Income Taxes Amount EffectiveIncomeTaxRateReconciliationUnregulatedTaxCutsAndJobsActExcessDeferredIncomeTaxesAmount	-3385000	usd
CY2022	nweg	Effective Income Tax Rate Reconciliation Unregulated Tax Cuts And Jobs Act Excess Deferred Income Taxes Amount EffectiveIncomeTaxRateReconciliationUnregulatedTaxCutsAndJobsActExcessDeferredIncomeTaxesAmount	0	usd
CY2021	nweg	Effective Income Tax Rate Reconciliation Unregulated Tax Cuts And Jobs Act Excess Deferred Income Taxes Amount EffectiveIncomeTaxRateReconciliationUnregulatedTaxCutsAndJobsActExcessDeferredIncomeTaxesAmount	0	usd
CY2023	nweg	Effective Income Tax Rate Reconciliation Reduction Resultingfrom Lapseof Applicable Statuteof Limitations EffectiveIncomeTaxRateReconciliationReductionResultingfromLapseofApplicableStatuteofLimitations	3241000	usd
CY2022	nweg	Effective Income Tax Rate Reconciliation Reduction Resultingfrom Lapseof Applicable Statuteof Limitations EffectiveIncomeTaxRateReconciliationReductionResultingfromLapseofApplicableStatuteofLimitations	0	usd
CY2021	nweg	Effective Income Tax Rate Reconciliation Reduction Resultingfrom Lapseof Applicable Statuteof Limitations EffectiveIncomeTaxRateReconciliationReductionResultingfromLapseofApplicableStatuteofLimitations	0	usd
CY2023	nweg	Effective Income Tax Rate Reconciliation Amortizationof Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationofExcessDeferredTaxes	-2184000	usd
CY2022	nweg	Effective Income Tax Rate Reconciliation Amortizationof Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationofExcessDeferredTaxes	-1657000	usd
CY2021	nweg	Effective Income Tax Rate Reconciliation Amortizationof Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationofExcessDeferredTaxes	-635000	usd
CY2023	nweg	Income Tax Reconciliation Deductions Accelerated Tax Depreciation Flow Through Adjustment IncomeTaxReconciliationDeductionsAcceleratedTaxDepreciationFlowThroughAdjustment	-6595000	usd
CY2022	nweg	Income Tax Reconciliation Deductions Accelerated Tax Depreciation Flow Through Adjustment IncomeTaxReconciliationDeductionsAcceleratedTaxDepreciationFlowThroughAdjustment	222000	usd
CY2021	nweg	Income Tax Reconciliation Deductions Accelerated Tax Depreciation Flow Through Adjustment IncomeTaxReconciliationDeductionsAcceleratedTaxDepreciationFlowThroughAdjustment	941000	usd
CY2023	nweg	Reduction To Previously Claimed Alternative Minimum Tax Credit ReductionToPreviouslyClaimedAlternativeMinimumTaxCredit	3186000	usd
CY2022	nweg	Reduction To Previously Claimed Alternative Minimum Tax Credit ReductionToPreviouslyClaimedAlternativeMinimumTaxCredit	0	usd
CY2022	nweg	Reduction To Previously Claimed Alternative Minimum Tax Credit ReductionToPreviouslyClaimedAlternativeMinimumTaxCredit	0	usd
CY2023	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	45000	usd
CY2022	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-1397000	usd
CY2021	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-12000	usd
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-237000	usd
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-364000	usd
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1881000	usd
CY2023	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-34811000	usd
CY2022	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-38909000	usd
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-36535000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7539000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-605000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3419000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	113366000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	0	usd
CY2023Q4	nweg	Deferredtaxassetsproductiontaxcredits Deferredtaxassetsproductiontaxcredits	94283000	usd
CY2022Q4	nweg	Deferredtaxassetsproductiontaxcredits Deferredtaxassetsproductiontaxcredits	80097000	usd
CY2023Q4	nweg	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	28300000	usd
CY2022Q4	nweg	Deferred Tax Assets Customer Advances DeferredTaxAssetsCustomerAdvances	25119000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	15131000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	19291000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	10716000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	10306000	usd
CY2023Q4	nweg	Deferred Tax Assets Unbilled Revenue DeferredTaxAssetsUnbilledRevenue	10604000	usd
CY2022Q4	nweg	Deferred Tax Assets Unbilled Revenue DeferredTaxAssetsUnbilledRevenue	9440000	usd
CY2023Q4	nweg	Deferred Tax Assets Environmental Liability DeferredTaxAssetsEnvironmentalLiability	5760000	usd
CY2022Q4	nweg	Deferred Tax Assets Environmental Liability DeferredTaxAssetsEnvironmentalLiability	6009000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	3280000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	3372000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	3098000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	4016000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2677000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2595000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	287215000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	160245000	usd
CY2023Q4	nweg	Deferred Tax Liabilities Excess Tax Depreciation DeferredTaxLiabilitiesExcessTaxDepreciation	660440000	usd
CY2022Q4	nweg	Deferred Tax Liabilities Excess Tax Depreciation DeferredTaxLiabilitiesExcessTaxDepreciation	449724000	usd
CY2023Q4	nweg	Deferred Tax Liabilities Flow Through Depreciation DeferredTaxLiabilitiesFlowThroughDepreciation	120558000	usd
CY2022Q4	nweg	Deferred Tax Liabilities Flow Through Depreciation DeferredTaxLiabilitiesFlowThroughDepreciation	106623000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	88323000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	86874000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	18414000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	56007000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	887735000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	699228000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	600520000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	538983000	usd
CY2023Q4	nweg	Deferredtaxassetsproductiontaxcredits Deferredtaxassetsproductiontaxcredits	94300000	usd
CY2023	nweg	Unrecognized Tax Benefit More Likely Than Not Percentage Threshold UnrecognizedTaxBenefitMoreLikelyThanNotPercentageThreshold	0.50
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30330000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	32049000	usd
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	33491000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	293000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	2256000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	1719000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	1735000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28074000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30330000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	32049000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	24400000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	27900000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	4500000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1400000	usd
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	2000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	usd
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-8000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-8000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-57000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-57000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-612000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	160000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-612000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	160000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-614000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	162000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-452000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	331000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-69000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	262000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	1359000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-377000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	982000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	585000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-149000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	436000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	283000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-91000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	192000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-755000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	217000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-538000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-28000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-13000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-41000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	1437000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	1435000	usd
CY2023Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-9373000	usd
CY2022Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-9825000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-280000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-542000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7656000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7848000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7848000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	2000	usd
CY2023	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-452000	usd
CY2023	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	262000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	192000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7656000	usd
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7310000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-8000	usd
CY2022	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-452000	usd
CY2022	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	982000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-538000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7848000	usd
CY2023	nweg	Defined Benefit Plan Percentage Threshold Of Differences Between Actuarial Assumptions And Actual Plan Results That Are Greater Than Projected Benefit Or Market Value DefinedBenefitPlanPercentageThresholdOfDifferencesBetweenActuarialAssumptionsAndActualPlanResultsThatAreGreaterThanProjectedBenefitOrMarketValue	0.10
CY2023	us-gaap	Defined Benefit Plan Other Changes DefinedBenefitPlanOtherChanges	10500000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	0.05
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0433
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0182
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y
CY2022	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.044
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.045
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3600000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4200000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3900000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1000000.0	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1300000	usd
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	200000	usd
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	6500000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	4400000	usd
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	4300000	usd
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	4200000	usd
CY2023Q4	nweg	Combined Common And Preferred Stock Shares Authorized CombinedCommonAndPreferredStockSharesAuthorized	250000000	shares
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	2865957	shares
CY2023	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	4167	shares
CY2022	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	16120	shares
CY2023Q4	nweg	Amount Of Unrestricted Net Assets For Consolidated And Unconsolidated Subsidiaries AmountOfUnrestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries	920000000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60321481	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55769156	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	51709229	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	36312	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	26621	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	111940	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	496333	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	51057	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	60357793	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56292110	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	51872226	shares
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	25913	shares
CY2023	nweg	Unrecovered Amount Periodic Adjustment Of The Liability For Price Escalation UnrecoveredAmountPeriodicAdjustmentOfTheLiabilityForPriceEscalation	-4200000	usd
CY2023	nweg	Unrecovered Amount Annual Reset To Actual Output And Pricing Change Year Over Year UnrecoveredAmountAnnualResetToActualOutputAndPricingChangeYearOverYear	1000000	usd
CY2023	nweg	Unrecovered Amount Annual Resetto Actual Outputand Pricing UnrecoveredAmountAnnualResettoActualOutputandPricing	800000	usd
CY2022	nweg	Unrecovered Amount Annual Resetto Actual Outputand Pricing UnrecoveredAmountAnnualResettoActualOutputandPricing	1800000	usd
CY2023	nweg	Long Term Purchase Committments Costs Incurred LongTermPurchaseCommittmentsCostsIncurred	340000000	usd
CY2022	nweg	Long Term Purchase Committments Costs Incurred LongTermPurchaseCommittmentsCostsIncurred	328000000	usd
CY2021	nweg	Long Term Purchase Committments Costs Incurred LongTermPurchaseCommittmentsCostsIncurred	286700000	usd
CY2023Q4	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	321900000	usd
CY2023Q4	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	244100000	usd
CY2023Q4	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	263400000	usd
CY2023Q4	us-gaap	Purchase Obligation Due In Fourth Year PurchaseObligationDueInFourthYear	243600000	usd
CY2023Q4	us-gaap	Purchase Obligation Due In Fifth Year PurchaseObligationDueInFifthYear	225900000	usd
CY2023Q4	us-gaap	Purchase Obligation Due After Fifth Year PurchaseObligationDueAfterFifthYear	1500000000	usd
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1554800000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1459400000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1326800000	usd
CY2023	us-gaap	Revenues Revenues	1422143000	usd
CY2023	nweg	Utility Operating Expense Fuel Purchased Supply And Direct Transmission Expense UtilityOperatingExpenseFuelPurchasedSupplyAndDirectTransmissionExpense	420262000	usd
CY2023	nweg	Utility Margin UtilityMargin	1001881000	usd
CY2023	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	220524000	usd
CY2023	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	117360000	usd
CY2023	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	153068000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	210474000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	300455000	usd
CY2023	us-gaap	Interest And Debt Expense InterestAndDebtExpense	114617000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	15832000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7539000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	194131000	usd
CY2023Q4	us-gaap	Assets Assets	7600652000	usd
CY2023	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	566889000	usd
CY2022	us-gaap	Revenues Revenues	1477837000	usd
CY2022	nweg	Utility Operating Expense Fuel Purchased Supply And Direct Transmission Expense UtilityOperatingExpenseFuelPurchasedSupplyAndDirectTransmissionExpense	492011000	usd
CY2022	nweg	Utility Margin UtilityMargin	985826000	usd
CY2022	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	221427000	usd
CY2022	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	113776000	usd
CY2022	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	192524000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	195020000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	263079000	usd
CY2022	us-gaap	Interest And Debt Expense InterestAndDebtExpense	100110000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	19434000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-605000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	183008000	usd
CY2022Q4	us-gaap	Assets Assets	7317783000	usd
CY2022	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	515140000	usd
CY2021	us-gaap	Revenues Revenues	1372316000	usd
CY2021	nweg	Utility Operating Expense Fuel Purchased Supply And Direct Transmission Expense UtilityOperatingExpenseFuelPurchasedSupplyAndDirectTransmissionExpense	425548000	usd
CY2021	nweg	Utility Margin UtilityMargin	946768000	usd
CY2021	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	208303000	usd
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	101873000	usd
CY2021	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	173444000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	187467000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	275681000	usd
CY2021	us-gaap	Interest And Debt Expense InterestAndDebtExpense	93674000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	8252000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3419000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	186840000	usd
CY2021Q4	us-gaap	Assets Assets	6780443000	usd
CY2021	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	434328000	usd
CY2023Q4	us-gaap	Revenues Revenues	356009000	usd
CY2022Q4	us-gaap	Revenues Revenues	425283000	usd
CY2023Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	103163000	usd
CY2022Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	83228000	usd
CY2023Q4	us-gaap	Net Income Loss NetIncomeLoss	83142000	usd
CY2022Q4	us-gaap	Net Income Loss NetIncomeLoss	66743000	usd
CY2023Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	61244000	shares
CY2022Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	58345000	shares
CY2023Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.37
CY2022Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.16
CY2023Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.37
CY2022Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.16

Files In Submission

Name	View Source	Status
0001993004-24-000006-index-headers.html	Edgar Link	pending
0001993004-24-000006-index.html	Edgar Link	pending
0001993004-24-000006.txt	Edgar Link	pending
0001993004-24-000006-xbrl.zip	Edgar Link	pending
exhibit101aofficersdeferre.htm	Edgar Link	pending
exhibit21subsidiaries2023.htm	Edgar Link	pending
exhibit23consent10k2023.htm	Edgar Link	pending
exhibit311certification2023.htm	Edgar Link	pending
exhibit312certification2023.htm	Edgar Link	pending
exhibit321certification2023.htm	Edgar Link	pending
exhibit322certification2023.htm	Edgar Link	pending
exhibit97policyfortherecov.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nweg-20231231.htm	Edgar Link	pending
nweg-20231231.xsd	Edgar Link	pending
nweg-20231231_g1.jpg	Edgar Link	pending
nweg-20231231_g2.jpg	Edgar Link	pending
nweg-20231231_g3.jpg	Edgar Link	pending
nweg-20231231_g4.jpg	Edgar Link	pending
nweg-20231231_g5.jpg	Edgar Link	pending
nweg-20231231_g6.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
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R3.htm	Edgar Link	pending
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R31.htm	Edgar Link	pending
nweg-20231231_cal.xml	Edgar Link	unprocessable
nweg-20231231_def.xml	Edgar Link	unprocessable
nweg-20231231_lab.xml	Edgar Link	unprocessable
nweg-20231231_pre.xml	Edgar Link	unprocessable
nweg-20231231_htm.xml	Edgar Link	completed
R32.htm	Edgar Link	pending
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R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable

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$NWE
NorthWestern Energy Group, Inc. Stock $nwe

2024 Q1 Form 10-K Financial Statement

#000199300424000006 Filed on February 15, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWE NorthWestern Energy Group, Inc. Stock $nwe

2024 Q1 Form 10-K Financial Statement

#000199300424000006 Filed on February 15, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWE
NorthWestern Energy Group, Inc. Stock $nwe