$TXNM
TXNM ENERGY INC Stock $txnm

$txnm Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000110842621000010 Filed on March 01, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$359.3M	$472.5M	$357.6M
YoY Change	4.4%	8.97%	8.3%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$68.20M	$51.60M	$50.50M
YoY Change	46.98%	8.4%	17.99%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$81.20M	$77.70M	$78.30M
YoY Change	6.98%	0.78%	5.53%
% of Gross Profit
Operating Expenses	$339.6M	$324.7M	$286.5M
YoY Change	19.96%	10.82%	4.37%
Operating Profit	$18.59M	$147.8M	$71.15M
YoY Change	-69.3%	5.17%	-176.0%
Interest Expense	-$2.600M	$27.26M	$31.09M
YoY Change	-84.15%	-10.2%	4.35%
% of Operating Profit	-13.99%	18.45%	43.69%
Other Income/Expense, Net	$1.700M	$7.361M	$3.307M
YoY Change	-270.0%	103.79%	6.1%
Pretax Income	$17.60M	$137.8M	$65.84M
YoY Change	-59.16%	18.83%	-157.19%
Income Tax	$5.900M	$12.33M	$4.275M
% Of Pretax Income	33.52%	8.95%	6.49%
Net Earnings	$8.778M	$121.8M	$57.49M
YoY Change	-72.4%	18.48%	-175.73%
Net Earnings / Revenue	2.44%	25.77%	16.07%
Basic Earnings Per Share	$0.11	$1.52	$0.72
Diluted Earnings Per Share	$0.10	$1.52	$0.72
COMMON SHARES
Basic Shares Outstanding	79.65M shares	79.87M shares	79.84M shares
Diluted Shares Outstanding		79.91M shares	79.88M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$47.90M	$30.90M	$2.800M
YoY Change	1160.53%	53.73%	-33.33%
Cash & Equivalents	$47.93M	$30.89M	$2.823M
Short-Term Investments
Other Short-Term Assets	$22.49M	$50.07M	$51.28M
YoY Change	-49.44%	2.68%	4.1%
Inventory	$66.42M	$67.44M	$69.68M
Prepaid Expenses	$42.06M
Receivables	$113.4M	$135.4M	$96.21M
Other Receivables	$29.50M	$18.00M	$14.90M
Total Short-Term Assets	$377.5M	$378.0M	$326.9M
YoY Change	28.39%	10.79%	9.3%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.094B	$5.908B	$5.806B
YoY Change	8.64%	7.51%	7.57%
Goodwill	$278.3M	$278.3M	$278.3M
YoY Change	0.0%	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$90.66M	$90.52M	$84.04M
YoY Change	39.13%	61.4%	110.08%
Other Assets	$658.7M	$678.5M	$689.1M
YoY Change	-0.56%	2.69%	2.79%
Total Long-Term Assets	$7.562B	$7.364B	$7.248B
YoY Change	7.96%	7.35%	7.38%
TOTAL ASSETS
Total Short-Term Assets	$377.5M	$378.0M	$326.9M
Total Long-Term Assets	$7.562B	$7.364B	$7.248B
Total Assets	$7.940B	$7.742B	$7.574B
YoY Change	8.78%	7.52%	7.46%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$169.3M	$84.68M	$75.93M
YoY Change	64.2%	3.68%	-6.15%
Accrued Expenses	$95.70M	$99.90M	$87.60M
YoY Change	-9.63%	-1.87%	5.16%
Deferred Revenue	$6.606M	$9.173M	$10.00M
YoY Change	-37.59%	-14.51%	-6.38%
Short-Term Debt	$32.00M	$184.3M	$252.5M
YoY Change	-82.71%	-36.36%	-26.24%
Long-Term Debt Due	$575.5M	$779.6M	$779.4M
YoY Change	17.39%	102.37%	677.92%
Total Short-Term Liabilities	$977.7M	$1.252B	$1.266B
YoY Change	1.05%	32.34%	89.9%
LONG-TERM LIABILITIES
Long-Term Debt	$2.720B	$2.510B	$2.437B
YoY Change	8.03%	1.73%	-8.79%
Other Long-Term Liabilities	$1.421B	$1.447B	$1.443B
YoY Change	-0.46%	1.79%	0.71%
Total Long-Term Liabilities	$2.720B	$2.510B	$2.437B
YoY Change	8.03%	1.73%	-8.79%
TOTAL LIABILITIES
Total Short-Term Liabilities	$977.7M	$1.252B	$1.266B
Total Long-Term Liabilities	$2.720B	$2.510B	$2.437B
Total Liabilities	$5.820B	$5.898B	$5.807B
YoY Change	4.95%	8.13%	8.28%
SHAREHOLDERS EQUITY
Retained Earnings	$698.7M	$718.0M	$645.3M
YoY Change	11.34%	15.77%	14.48%
Common Stock	$1.430B	$1.145B	$1.144B
YoY Change	24.28%	-0.39%	-0.42%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.049B	$1.773B	$1.697B
YoY Change
Total Liabilities & Shareholders Equity	$7.940B	$7.742B	$7.574B
YoY Change	8.78%	7.52%	7.46%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	$8.778M	$121.8M	$57.49M
YoY Change	-72.4%	18.48%	-175.73%
Depreciation, Depletion And Amortization	$81.20M	$77.70M	$78.30M
YoY Change	6.98%	0.78%	5.53%
Cash From Operating Activities	$117.7M	$202.2M	$72.00M
YoY Change	-22.51%	12.71%	7.14%
INVESTING ACTIVITIES
Capital Expenditures	-$183.7M	-$151.5M	-$203.6M
YoY Change	7.18%	-0.2%	34.75%
Acquisitions
YoY Change
Other Investing Activities	-$22.80M	-$8.600M	-$10.80M
YoY Change	25.27%	-57.84%	18.68%
Cash From Investing Activities	-$206.4M	-$160.2M	-$214.4M
YoY Change	8.86%	-6.97%	33.83%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	105.7M	-13.90M	128.9M
YoY Change	393.93%	-261.63%	-255.68%
NET CHANGE
Cash From Operating Activities	117.7M	202.2M	72.00M
Cash From Investing Activities	-206.4M	-160.2M	-214.4M
Cash From Financing Activities	105.7M	-13.90M	128.9M
Net Change In Cash	17.00M	28.10M	-13.50M
YoY Change	-204.29%	77.85%	-92.32%
FREE CASH FLOW
Cash From Operating Activities	$117.7M	$202.2M	$72.00M
Capital Expenditures	-$183.7M	-$151.5M	-$203.6M
Free Cash Flow	$301.4M	$353.7M	$275.6M
YoY Change	-6.77%	6.79%	26.25%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001108426
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	NM
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	87102
CY2020	dei	City Area Code CityAreaCode	505
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Entity Registrant Name EntityRegistrantName	PNM Resources, Inc.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NM
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	414 Silver Ave. SW
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Albuquerque
CY2020	dei	Local Phone Number LocalPhoneNumber	241-2700
CY2020	dei	Entity File Number EntityFileNumber	001-32462
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	85-0468296
CY2020	dei	Security12b Title Security12bTitle	Common Stock, no par value
CY2020	dei	Trading Symbol TradingSymbol	PNM
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	85834874	shares
CY2020Q2	dei	Entity Public Float EntityPublicFloat	3061885307	USD
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CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1377208000	USD
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CY2020	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	-11994000	USD
CY2019	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	-542000	USD
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CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	99746000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	14013000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	14241000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	15112000	USD
CY2020	pnm	Preferred Stock Dividend Requirements Of Subsidiary PreferredStockDividendRequirementsOfSubsidiary	528000	USD
CY2019	pnm	Preferred Stock Dividend Requirements Of Subsidiary PreferredStockDividendRequirementsOfSubsidiary	528000	USD
CY2018	pnm	Preferred Stock Dividend Requirements Of Subsidiary PreferredStockDividendRequirementsOfSubsidiary	528000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	192969000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	86669000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	84106000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	187316000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	92131000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	101282000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	314668000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	301068000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	275641000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	20405000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-25385000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8019000	USD
CY2020	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	21599000	USD
CY2019	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	29589000	USD
CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-17176000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	8141000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	6414000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	7120000	USD
CY2020	pnm	Regulatory Disallowances And Restructuring Costs RegulatoryDisallowancesAndRestructuringCosts	1098000	USD
CY2019	pnm	Regulatory Disallowances And Restructuring Costs RegulatoryDisallowancesAndRestructuringCosts	151095000	USD
CY2018	pnm	Regulatory Disallowances And Restructuring Costs RegulatoryDisallowancesAndRestructuringCosts	65598000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	11254000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	9478000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	10404000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-3497000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2395000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-3529000	USD
CY2020	pnm	Increase Decrease In Accounts Receivable And Unbilled Revenues IncreaseDecreaseInAccountsReceivableAndUnbilledRevenues	42035000	USD
CY2019	pnm	Increase Decrease In Accounts Receivable And Unbilled Revenues IncreaseDecreaseInAccountsReceivableAndUnbilledRevenues	-3796000	USD
CY2018	pnm	Increase Decrease In Accounts Receivable And Unbilled Revenues IncreaseDecreaseInAccountsReceivableAndUnbilledRevenues	8702000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-11512000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	6095000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	5331000	USD
CY2020	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	8135000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-1872000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-2491000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-29923000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-42803000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	840000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	7403000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-272000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-20714000	USD
CY2020	pnm	Increase Decrease In Accrued Interest And Taxes IncreaseDecreaseInAccruedInterestAndTaxes	-9347000	USD
CY2019	pnm	Increase Decrease In Accrued Interest And Taxes IncreaseDecreaseInAccruedInterestAndTaxes	14691000	USD
CY2018	pnm	Increase Decrease In Accrued Interest And Taxes IncreaseDecreaseInAccruedInterestAndTaxes	1713000	USD
CY2020	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	23740000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-7212000	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	2614000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-29633000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-35071000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-10966000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	485700000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	503163000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	428226000	USD
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	679028000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	616273000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	501213000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	590998000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	494528000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	984533000	USD
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	607591000	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	513866000	USD
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1007022000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	23250000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	38250000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	9000000	USD
CY2020	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	0	USD
CY2019	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	0	USD
CY2018	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	56640000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	14928000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	37000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-338000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-733799000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-673898000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-475724000	USD
CY2020	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	0	USD
CY2019	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-150000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	50000000	USD
CY2020	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-153100000	USD
CY2019	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	99200000	USD
CY2018	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-119500000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1267845000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	745000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	984652000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	977845000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	407302000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	750162000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	24000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	943000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	963000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	11984000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	9918000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	12635000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	98502000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	92926000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	84961000	USD
CY2020	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	18056000	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	15401000	USD
CY2018	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	17095000	USD
CY2020	pnm	Proceeds From Transmission Interconnection Arrangements ProceedsFromTransmissionInterconnectionArrangements	11452000	USD
CY2019	pnm	Proceeds From Transmission Interconnection Arrangements ProceedsFromTransmissionInterconnectionArrangements	10015000	USD
CY2018	pnm	Proceeds From Transmission Interconnection Arrangements ProceedsFromTransmissionInterconnectionArrangements	4060000	USD
CY2020	pnm	Repayment Of Transmission Interconnection Agreements RepaymentOfTransmissionInterconnectionAgreements	5905000	USD
CY2019	pnm	Repayment Of Transmission Interconnection Agreements RepaymentOfTransmissionInterconnectionAgreements	4325000	USD
CY2018	pnm	Repayment Of Transmission Interconnection Agreements RepaymentOfTransmissionInterconnectionAgreements	2830000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4943000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2840000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-6846000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	292194000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	172446000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	45646000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	44095000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1711000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1852000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3833000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2122000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3974000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	47928000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3833000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2122000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	106575000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	115476000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	119308000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	969000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-2929000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	842000	USD
CY2020	pnm	Increase Decreaseincapitalexpendituresincurredbutnotyetpaid IncreaseDecreaseincapitalexpendituresincurredbutnotyetpaid	-58796000	USD
CY2019	pnm	Increase Decreaseincapitalexpendituresincurredbutnotyetpaid IncreaseDecreaseincapitalexpendituresincurredbutnotyetpaid	8781000	USD
CY2018	pnm	Increase Decreaseincapitalexpendituresincurredbutnotyetpaid IncreaseDecreaseincapitalexpendituresincurredbutnotyetpaid	-11502000	USD
CY2020	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	801000	USD
CY2019	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2018	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	578000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47928000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3833000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	8333000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1163000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	113410000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	85889000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	55504000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	57416000	USD
CY2020Q4	us-gaap	Other Receivables OtherReceivables	23797000	USD
CY2019Q4	us-gaap	Other Receivables OtherReceivables	12165000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	66417000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	77929000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	202000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	7373000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	5672000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	4933000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	64549000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	44472000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	377479000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	294010000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	440115000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	388832000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	90655000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	65159000	USD
CY2020Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	284000	USD
CY2019Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	356000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	24075000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	12459000	USD
CY2020Q4	pnm	Total Other Property And Investments TotalOtherPropertyAndInvestments	555129000	USD
CY2019Q4	pnm	Total Other Property And Investments TotalOtherPropertyAndInvestments	466806000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	8480799000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	7918601000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	2835170000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	2713503000	USD
CY2020Q4	pnm	Public Utilities Property Plant And Equipment Net In Service PublicUtilitiesPropertyPlantAndEquipmentNetInService	5645629000	USD
CY2019Q4	pnm	Public Utilities Property Plant And Equipment Net In Service PublicUtilitiesPropertyPlantAndEquipmentNetInService	5205098000	USD
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	218719000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	161106000	USD
CY2020Q4	pnm	Accumulated Amortization Nuclear Fuel AccumulatedAmortizationNuclearFuel	41367000	USD
CY2019Q4	pnm	Accumulated Amortization Nuclear Fuel AccumulatedAmortizationNuclearFuel	42354000	USD
CY2020Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	100801000	USD
CY2019Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	99805000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	5965149000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	5466009000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	557790000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	556930000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	278297000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	278297000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	105133000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	131212000	USD
CY2020Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	100877000	USD
CY2019Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	105510000	USD
CY2020Q4	pnm	Total Deferred Charges And Other Assets TotalDeferredChargesAndOtherAssets	1042097000	USD
CY2019Q4	pnm	Total Deferred Charges And Other Assets TotalDeferredChargesAndOtherAssets	1071949000	USD
CY2020Q4	us-gaap	Assets Assets	7939854000	USD
CY2019Q4	us-gaap	Assets Assets	7298774000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	32000000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	185100000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	575518000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	490268000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	169317000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	103118000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	6606000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	10585000	USD
CY2020Q4	pnm	Accrued Interest And Taxes Payable AccruedInterestAndTaxesPayable	68206000	USD
CY2019Q4	pnm	Accrued Interest And Taxes Payable AccruedInterestAndTaxesPayable	76815000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	7471000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	505000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	27460000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	29068000	USD
CY2020Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	28243000	USD
CY2019Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	24625000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	62841000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	47397000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	977662000	USD
CY2019Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	2060565000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	967481000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2719632000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2517449000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	694512000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	626058000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	850228000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	866243000	USD
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	183421000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	181962000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	58101000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	95037000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	81065000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	105512000	USD
CY2020Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	255230000	USD
CY2019Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	185753000	USD
CY2020Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	2122557000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	5819851000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	5545495000	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Par Or Stated Value Per Share CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsParOrStatedValuePerShare	100
CY2020Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Par Or Stated Value Per Share CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsParOrStatedValuePerShare	100
CY2019Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Authorized CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesAuthorized	10000000	shares
CY2020Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Authorized CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesAuthorized	10000000	shares
CY2020Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Outstanding CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesOutstanding	115293	shares
CY2019Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Issued CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesIssued	115293	shares
CY2020Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Issued CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesIssued	115293	shares
CY2019Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Outstanding CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesOutstanding	115293	shares
CY2020Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirements	11529000	USD
CY2019Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirements	11529000	USD
CY2019Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2020Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	85834874	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	85834874	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	79653624	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	79653624	shares
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	1429941000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	1150552000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-79183000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-99377000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	698707000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	627523000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2049465000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1678698000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	59009000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	63052000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2108474000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1741750000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7939854000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7298774000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1761448000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	101282000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1536000	USD
CY2018	us-gaap	Dividends Preferred Stock DividendsPreferredStock	528000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	86425000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	963000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	12635000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	7120000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	17095000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1752594000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	92131000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	9307000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	528000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	93792000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	943000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	9918000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	6414000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	15401000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1741750000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	187316000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20194000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	528000	USD
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	101591000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	24000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	11984000	USD
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	283208000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	8141000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	18056000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2108474000	USD
CY2020	pnm	Adjustmentsto Additional Paidin Capital Parent Contributions AdjustmentstoAdditionalPaidinCapitalParentContributions	230000000	USD
CY2020Q4	pnm	Collaborative Arrangement Owner Obligations Default Amount CollaborativeArrangementOwnerObligationsDefaultAmount	0	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	66417000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	77929000	USD
CY2020	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	514878000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	275612000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	285281000	USD
CY2020	us-gaap	Investment Income Interest InvestmentIncomeInterest	14223000	USD
CY2020	pnm	Other Income Deductions Excluding Interest OtherIncomeDeductionsExcludingInterest	22840000	USD
CY2020	us-gaap	Interest Expense InterestExpense	114392000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	207952000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20636000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	187316000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	14013000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	528000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	172775000	USD
CY2020Q4	us-gaap	Assets Assets	7939854000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	278297000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	632783000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	267808000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	144200000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	14022000	USD
CY2019	pnm	Other Income Deductions Excluding Interest OtherIncomeDeductionsExcludingInterest	29643000	USD
CY2019	us-gaap	Interest Expense InterestExpense	121016000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	66849000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-25282000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	92131000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	14241000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	528000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	77362000	USD
CY2019Q4	us-gaap	Assets Assets	7298774000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	278297000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	559652000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	241188000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	236047000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	15540000	USD
CY2018	pnm	Other Income Deductions Excluding Interest OtherIncomeDeductionsExcludingInterest	-15286000	USD
CY2018	us-gaap	Interest Expense InterestExpense	127244000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	109057000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7775000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	101282000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	15112000	USD
CY2018	us-gaap	Dividends Preferred Stock DividendsPreferredStock	528000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	85642000	USD
CY2018Q4	us-gaap	Assets Assets	6865551000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	278297000	USD
CY2018	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	1756000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Amortization Period CapitalizedContractCostAmortizationPeriod	P5Y
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1469799000	USD
CY2020	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	-11994000	USD
CY2020	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	65207000	USD
CY2020	us-gaap	Revenues Revenues	1523012000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1377208000	USD
CY2019	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	-542000	USD
CY2019	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	80937000	USD
CY2019	us-gaap	Revenues Revenues	1457603000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1359740000	USD
CY2018	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	75117000	USD
CY2018	us-gaap	Revenues Revenues	1436613000	USD
CY2020Q4	us-gaap	Commodity Contract Asset Current CommodityContractAssetCurrent	0	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	172775000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	77362000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	85642000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	79941000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	79654000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	79654000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	216000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	277000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	236000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80157000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	79931000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	79890000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	106000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	40000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	59000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	122000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80303000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	79990000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80012000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.16
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.97
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.07
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.15
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.07
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.2500
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.1775
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.0850
CY2020	us-gaap	Dividends Dividends	423700000	USD
CY2018Q1	us-gaap	Derivative Fixed Interest Rate DerivativeFixedInterestRate	0.01927
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	40000000.0	USD
CY2019Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	50000000.0	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	32000000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	185100000	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4700000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3294043000	USD
CY2020Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-1107000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3004043000	USD
CY2019Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-3674000	USD
CY2020Q4	pnm	Longtermdebt Currentmaturities Gross LongtermdebtCurrentmaturitiesGross	576000000	USD
CY2020Q4	pnm	Unamortized Loan Commitmentand Origination Feesand Unamortized Discountsor Premiums Current Portion UnamortizedLoanCommitmentandOriginationFeesandUnamortizedDiscountsorPremiumsCurrentPortion	482000	USD
CY2019Q4	pnm	Longtermdebt Currentmaturities Gross LongtermdebtCurrentmaturitiesGross	490345000	USD
CY2019Q4	pnm	Unamortized Loan Commitmentand Origination Feesand Unamortized Discountsor Premiums Current Portion UnamortizedLoanCommitmentandOriginationFeesandUnamortizedDiscountsorPremiumsCurrentPortion	77000	USD
CY2020Q4	pnm	Longtermdebt Excludingcurrentmaturities Gross LongtermdebtExcludingcurrentmaturitiesGross	2718043000	USD
CY2020Q4	pnm	Unamortized Loan Commitmentand Origination Feesand Unamortized Discountsor Premiums Excluding Current Portion UnamortizedLoanCommitmentandOriginationFeesandUnamortizedDiscountsorPremiumsExcludingCurrentPortion	-1589000	USD
CY2019Q4	pnm	Longtermdebt Excludingcurrentmaturities Gross LongtermdebtExcludingcurrentmaturitiesGross	2513698000	USD
CY2019Q4	pnm	Unamortized Loan Commitmentand Origination Feesand Unamortized Discountsor Premiums Excluding Current Portion UnamortizedLoanCommitmentandOriginationFeesandUnamortizedDiscountsorPremiumsExcludingCurrentPortion	-3751000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	576000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	619500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	285345000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	205000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	354000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1254198000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3294043000	USD
CY2020Q4	pnm	Unamortized Cost Of Prepaid Right Of Way Agreements UnamortizedCostOfPrepaidRightOfWayAgreements	55800000	USD
CY2019Q4	pnm	Unamortized Cost Of Prepaid Right Of Way Agreements UnamortizedCostOfPrepaidRightOfWayAgreements	60200000	USD
CY2020	pnm	Amortization Of Prepaid Right Of Way Agreements AmortizationOfPrepaidRightOfWayAgreements	4400000	USD
CY2019	pnm	Amortization Of Prepaid Right Of Way Agreements AmortizationOfPrepaidRightOfWayAgreements	3700000	USD
CY2018	pnm	Amortization Of Prepaid Right Of Way Agreements AmortizationOfPrepaidRightOfWayAgreements	3800000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	105133000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	131212000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	27460000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	29068000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	81065000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	105512000	USD
CY2020Q4	pnm	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	25055000	USD
CY2019Q4	pnm	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	10028000	USD
CY2020Q4	pnm	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	4383000	USD
CY2019Q4	pnm	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	973000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	20672000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	9055000	USD
CY2020Q4	pnm	Finance Lease Liability Current Other FinanceLeaseLiabilityCurrentOther	4470000	USD
CY2019Q4	pnm	Finance Lease Liability Current Other FinanceLeaseLiabilityCurrentOther	1637000	USD
CY2020Q4	pnm	Finance Lease Liability Deferred Credits Other FinanceLeaseLiabilityDeferredCreditsOther	15972000	USD
CY2019Q4	pnm	Finance Lease Liability Deferred Credits Other FinanceLeaseLiabilityDeferredCreditsOther	7102000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y14D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y5M26D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y9M14D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P5Y6M14D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0394
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0390
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0280
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0364
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	30418000	USD
CY2020	pnm	Operating Lease Capitalized Costs OperatingLeaseCapitalizedCosts	3395000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	27023000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3412000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	511000	USD
CY2020	pnm	Finance Lease Capitalized Costs FinanceLeaseCapitalizedCosts	2810000	USD
CY2020	pnm	Finance Lease Cost FinanceLeaseCost	1113000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	221000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	295000	USD
CY2020	us-gaap	Lease Cost LeaseCost	28652000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	31963000	USD
CY2019	pnm	Operating Lease Capitalized Costs OperatingLeaseCapitalizedCosts	3913000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	28050000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	973000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	194000	USD
CY2019	pnm	Finance Lease Capitalized Costs FinanceLeaseCapitalizedCosts	704000	USD
CY2019	pnm	Finance Lease Cost FinanceLeaseCost	463000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	96000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	414000	USD
CY2019	us-gaap	Lease Cost LeaseCost	29023000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	27121000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	27849000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	136000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	71000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	936000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	313000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	157816000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	15614000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	9645000	USD
CY2020	pnm	Operating Leases Capitalized Financing Costs Investing Activities OperatingLeasesCapitalizedFinancingCostsInvestingActivities	3400000	USD
CY2020	pnm	Finance Leases Capitalized Financing Costs Investing Activities FinanceLeasesCapitalizedFinancingCostsInvestingActivities	2800000	USD
CY2019	pnm	Operating Leases Capitalized Financing Costs Investing Activities OperatingLeasesCapitalizedFinancingCostsInvestingActivities	3900000	USD
CY2019	pnm	Finance Leases Capitalized Financing Costs Investing Activities FinanceLeasesCapitalizedFinancingCostsInvestingActivities	700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	4970000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	29290000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	4797000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	28464000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	4511000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	19395000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	3335000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	8841000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2044000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	7673000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	2150000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	27827000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	21807000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	121490000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	1365000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	12965000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	20442000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	108525000	USD
CY2020Q4	pnm	Lessee Operating Lease Unguaranteed Residual Value LesseeOperatingLeaseUnguaranteedResidualValue	26700000	USD
CY2020Q4	pnm	Contract With Customer Liability Net ContractWithCustomerLiabilityNet	0	USD
CY2019Q4	pnm	Contract With Customer Liability Net ContractWithCustomerLiabilityNet	0	USD
CY2020	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	5861000	USD
CY2019	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	5698000	USD
CY2018	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	4864000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	17707000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	18319000	USD
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-10523000	USD
CY2020	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	23568000	USD
CY2019	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	24017000	USD
CY2018	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-5659000	USD
CY2020	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-1969000	USD
CY2019	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	5572000	USD
CY2018	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-11517000	USD
CY2020	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	21599000	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	29589000	USD
CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-17176000	USD
CY2020	pnm	Increase Decrease In Other Than Temporary Losses Investments Portion Recognizedin Earnings Net Availableforsale Securities IncreaseDecreaseInOtherThanTemporaryLossesInvestmentsPortionRecognizedinEarningsNetAvailableforsaleSecurities	-3200000	USD
CY2019	pnm	Increase Decrease In Other Than Temporary Losses Investments Portion Recognizedin Earnings Net Availableforsale Securities IncreaseDecreaseInOtherThanTemporaryLossesInvestmentsPortionRecognizedinEarningsNetAvailableforsaleSecurities	3000000.0	USD
CY2018	pnm	Increase Decrease In Other Than Temporary Losses Investments Portion Recognizedin Earnings Net Availableforsale Securities IncreaseDecreaseInOtherThanTemporaryLossesInvestmentsPortionRecognizedinEarningsNetAvailableforsaleSecurities	-9400000	USD
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.040
CY2020	pnm	Defined Benefit Plans Gains And Losses That Lie Outside Corridor Amortized In Years DefinedBenefitPlansGainsAndLossesThatLieOutsideCorridorAmortizedInYears	P5Y
CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.75
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8100000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6400000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7100000	USD
CY2020Q4	pnm	Budgeted Future Construction Expenditures Year One BudgetedFutureConstructionExpendituresYearOne	1016500000	USD
CY2020Q4	pnm	Budgeted Future Construction Expenditures Year Two BudgetedFutureConstructionExpendituresYearTwo	765100000	USD
CY2020Q4	pnm	Budgeted Future Construction Expenditures Year Three BudgetedFutureConstructionExpendituresYearThree	761200000	USD
CY2020Q4	pnm	Budgeted Future Construction Expenditures Year Four BudgetedFutureConstructionExpendituresYearFour	713000000.0	USD
CY2020Q4	pnm	Budgeted Future Construction Expenditures Year Five BudgetedFutureConstructionExpendituresYearFive	705400000	USD
CY2020Q4	pnm	Total Budgeted Construction Expenditures TotalBudgetedConstructionExpenditures	3961200000	USD
CY2020Q4	pnm	Asset Retirement Obligation Liabilities Relatedto Nuclear Decommissioning AssetRetirementObligationLiabilitiesRelatedtoNuclearDecommissioning	0.76
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	146679000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	192000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	11482000	USD
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	705000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	158674000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	987000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	12635000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	11640000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	181962000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1444000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	11310000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-8407000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	183421000	USD
CY2020	pnm	Number Of Options For Meeting Bta Standards NumberOfOptionsForMeetingBTAStandards	7	option
CY2018Q1	pnm	Public Utilities Percentof Nonfuel Revenue Requirement Change Implemented PublicUtilitiesPercentofNonfuelRevenueRequirementChangeImplemented	0.50
CY2018	pnm	Tax Cuts And Jobs Act Of2017 Net Regulatory Liability TaxCutsAndJobsActOf2017NetRegulatoryLiability	7175000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Deferred Tax Liability Income Tax Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxLiabilityIncomeTaxBenefit	1910000	USD
CY2018	pnm	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Affiliate Receivables Payables Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateAffiliateReceivablesPayablesProvisionalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit	5265000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	60000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	231000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	43000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-244000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	17574000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-20372000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	7716000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3721000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-4491000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	648000	USD
CY2020	us-gaap	Other Income Tax Expense Benefit Continuing Operations OtherIncomeTaxExpenseBenefitContinuingOperations	-890000	USD
CY2019	us-gaap	Other Income Tax Expense Benefit Continuing Operations OtherIncomeTaxExpenseBenefitContinuingOperations	-522000	USD
CY2018	us-gaap	Other Income Tax Expense Benefit Continuing Operations OtherIncomeTaxExpenseBenefitContinuingOperations	-345000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20636000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-25282000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7775000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	43670000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	14038000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22902000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	890000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	522000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	345000	USD
CY2020	pnm	Effective Income Tax Rate Reconciliation Deductible Expense Amortization Of Excess Deferred Income Tax EffectiveIncomeTaxRateReconciliationDeductibleExpenseAmortizationOfExcessDeferredIncomeTax	30723000	USD
CY2019	pnm	Effective Income Tax Rate Reconciliation Deductible Expense Amortization Of Excess Deferred Income Tax EffectiveIncomeTaxRateReconciliationDeductibleExpenseAmortizationOfExcessDeferredIncomeTax	37799000	USD
CY2018	pnm	Effective Income Tax Rate Reconciliation Deductible Expense Amortization Of Excess Deferred Income Tax EffectiveIncomeTaxRateReconciliationDeductibleExpenseAmortizationOfExcessDeferredIncomeTax	19779000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	1368000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	1136000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	712000	USD
CY2020	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	2943000	USD
CY2019	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	2991000	USD
CY2018	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	3173000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6961000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	298000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1358000	USD
CY2020	pnm	Effective Income Tax Rate Reconciliation State Nol Carryforward Impairment EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment	0	USD
CY2019	pnm	Effective Income Tax Rate Reconciliation State Nol Carryforward Impairment EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment	0	USD
CY2018	pnm	Effective Income Tax Rate Reconciliation State Nol Carryforward Impairment EffectiveIncomeTaxRateReconciliationStateNOLCarryforwardImpairment	0	USD
CY2020	pnm	Effective Income Tax Rate Reconciliation Allowanceforequityfundsusedduringconstruction EffectiveIncomeTaxRateReconciliationAllowanceforequityfundsusedduringconstruction	-2363000	USD
CY2019	pnm	Effective Income Tax Rate Reconciliation Allowanceforequityfundsusedduringconstruction EffectiveIncomeTaxRateReconciliationAllowanceforequityfundsusedduringconstruction	-1990000	USD
CY2018	pnm	Effective Income Tax Rate Reconciliation Allowanceforequityfundsusedduringconstruction EffectiveIncomeTaxRateReconciliationAllowanceforequityfundsusedduringconstruction	-2185000	USD
CY2020	pnm	Effective Income Tax Rate Reconciliation Impairmentof Charitable Contribution Carryforwards EffectiveIncomeTaxRateReconciliationImpairmentofCharitableContributionCarryforwards	0	USD
CY2019	pnm	Effective Income Tax Rate Reconciliation Impairmentof Charitable Contribution Carryforwards EffectiveIncomeTaxRateReconciliationImpairmentofCharitableContributionCarryforwards	0	USD
CY2018	pnm	Effective Income Tax Rate Reconciliation Impairmentof Charitable Contribution Carryforwards EffectiveIncomeTaxRateReconciliationImpairmentofCharitableContributionCarryforwards	0	USD
CY2020	pnm	Effective Income Tax Rate Reconciliation Recoveryof Impairmentof Net Operating Loss Carryforward Amount EffectiveIncomeTaxRateReconciliationRecoveryofImpairmentofNetOperatingLossCarryforwardAmount	-1367000	USD
CY2019	pnm	Effective Income Tax Rate Reconciliation Recoveryof Impairmentof Net Operating Loss Carryforward Amount EffectiveIncomeTaxRateReconciliationRecoveryofImpairmentofNetOperatingLossCarryforwardAmount	-1367000	USD
CY2018	pnm	Effective Income Tax Rate Reconciliation Recoveryof Impairmentof Net Operating Loss Carryforward Amount EffectiveIncomeTaxRateReconciliationRecoveryofImpairmentofNetOperatingLossCarryforwardAmount	-1367000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	2914000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-392000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-795000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	4647000	USD
CY2020	pnm	Effective Income Tax Rate Reconciliation Non Deductible Compensation Amount EffectiveIncomeTaxRateReconciliationNonDeductibleCompensationAmount	2630000	USD
CY2019	pnm	Effective Income Tax Rate Reconciliation Non Deductible Compensation Amount EffectiveIncomeTaxRateReconciliationNonDeductibleCompensationAmount	1156000	USD
CY2018	pnm	Effective Income Tax Rate Reconciliation Non Deductible Compensation Amount EffectiveIncomeTaxRateReconciliationNonDeductibleCompensationAmount	891000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1951000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	820000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1534000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20636000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-25282000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7775000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.0992
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.3782
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.0713
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	41419000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	59488000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	148961000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	145087000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	121354000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	101231000	USD
CY2020Q4	pnm	Deferred Tax Assets Regulatory Disallowance DeferredTaxAssetsRegulatoryDisallowance	38531000	USD
CY2019Q4	pnm	Deferred Tax Assets Regulatory Disallowance DeferredTaxAssetsRegulatoryDisallowance	34639000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	42885000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	54199000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	393150000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	394644000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	738342000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	787928000	USD
CY2020Q4	pnm	Deferred Tax Liabilities Investment Tax Credit DeferredTaxLiabilitiesInvestmentTaxCredit	98669000	USD
CY2019Q4	pnm	Deferred Tax Liabilities Investment Tax Credit DeferredTaxLiabilitiesInvestmentTaxCredit	81186000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	61330000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	58495000	USD
CY2020Q4	pnm	Deferred Tax Liabilities Stranded Costs DeferredTaxLiabilitiesStrandedCosts	0	USD
CY2019Q4	pnm	Deferred Tax Liabilities Stranded Costs DeferredTaxLiabilitiesStrandedCosts	1466000	USD
CY2020Q4	pnm	Deferred Tax Liabilities Compensationand Benefits Pensions DeferredTaxLiabilitiesCompensationandBenefitsPensions	37099000	USD
CY2019Q4	pnm	Deferred Tax Liabilities Compensationand Benefits Pensions DeferredTaxLiabilitiesCompensationandBenefitsPensions	35029000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	27237000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	28831000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	124985000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	27767000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1087662000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1020702000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	694512000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	626058000	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-68454000	USD
CY2020	pnm	Change In Tax Effects Of Income Tax Related Regulatory Assets And Liabilities ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities	11602000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	47738000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	71150000	USD
CY2020	pnm	Amortization Of Excess Deferred Income Tax AmortizationOfExcessDeferredIncomeTax	30723000	USD
CY2020	pnm	Tax Effect Of Mark To Market Adjustments TaxEffectOfMarkToMarketAdjustments	-3206000	USD
CY2020	pnm	Tax Effect Of Excess Pension Liability TaxEffectOfExcessPensionLiability	-3670000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-2459000	USD
CY2020	pnm	Adjustmentforunrecognizedtaxbenefits Adjustmentforunrecognizedtaxbenefits	2459000	USD
CY2020	pnm	Operating Loss Carryforward Recoveryof Impairment Netof Amortization OperatingLossCarryforwardRecoveryofImpairmentNetofAmortization	-1367000	USD
CY2020	pnm	Alternative Minimum Tax Carryforward Reclassified To Receivable AlternativeMinimumTaxCarryforwardReclassifiedToReceivable	0	USD
CY2020	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-215000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	20405000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2020	pnm	State Tax Credit Carryforward Impairment StateTaxCreditCarryforwardImpairment	-425000	USD
CY2020	pnm	State Net Operating Loss Carryforward Impairment StateNetOperatingLossCarryforwardImpairment	0	USD
CY2020	pnm	Charitablecontributioncarryforward Impairment CharitablecontributioncarryforwardImpairment	0	USD
CY2020	pnm	Compensation Expense Impairment CompensationExpenseImpairment	96000	USD
CY2019	pnm	State Tax Credit Carryforward Impairment StateTaxCreditCarryforwardImpairment	425000	USD
CY2019	pnm	State Net Operating Loss Carryforward Impairment StateNetOperatingLossCarryforwardImpairment	0	USD
CY2019	pnm	Charitablecontributioncarryforward Impairment CharitablecontributioncarryforwardImpairment	0	USD
CY2019	pnm	Compensation Expense Impairment CompensationExpenseImpairment	-99000	USD
CY2018	pnm	State Tax Credit Carryforward Impairment StateTaxCreditCarryforwardImpairment	0	USD
CY2018	pnm	State Net Operating Loss Carryforward Impairment StateNetOperatingLossCarryforwardImpairment	0	USD
CY2018	pnm	Charitablecontributioncarryforward Impairment CharitablecontributioncarryforwardImpairment	0	USD
CY2018	pnm	Compensation Expense Impairment CompensationExpenseImpairment	410000	USD
CY2020Q4	pnm	Reservebalance Statetaxcreditcarryforward ReservebalanceStatetaxcreditcarryforward	0	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	0	USD
CY2020Q4	pnm	Reservebalance Charitablecontributioncarryforward ReservebalanceCharitablecontributioncarryforward	0	USD
CY2020	pnm	Reverse Balance Compensation Expense ReverseBalanceCompensationExpense	407000	USD
CY2019Q4	pnm	Reservebalance Statetaxcreditcarryforward ReservebalanceStatetaxcreditcarryforward	425000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	0	USD
CY2019Q4	pnm	Reservebalance Charitablecontributioncarryforward ReservebalanceCharitablecontributioncarryforward	0	USD
CY2019	pnm	Reverse Balance Compensation Expense ReverseBalanceCompensationExpense	311000	USD
CY2020Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.50
CY2020Q1	us-gaap	Revenues Revenues	333622000	USD
CY2020Q2	us-gaap	Revenues Revenues	357649000	USD
CY2020Q3	us-gaap	Revenues Revenues	472465000	USD
CY2020Q4	us-gaap	Revenues Revenues	359276000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	147805000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	18588000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	-11399000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	61561000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	125453000	USD
CY2020Q4	us-gaap	Profit Loss ProfitLoss	11701000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-15260000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	57489000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	121768000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	8778000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.19
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.72
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.52
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.19
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.52
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2019Q1	us-gaap	Revenues Revenues	349645000	USD
CY2019Q2	us-gaap	Revenues Revenues	330228000	USD
CY2019Q3	us-gaap	Revenues Revenues	433586000	USD
CY2019Q4	us-gaap	Revenues Revenues	344144000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	36723000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-93615000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	140540000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	60552000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	21662000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	-72283000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	106763000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	35989000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	18700000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-75914000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	102771000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	31805000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.95
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.29
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.95
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.28
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	283208000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD

Files In Submission

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$TXNM
TXNM ENERGY INC Stock $txnm

2020 Q4 Form 10-K Financial Statement

#000110842621000010 Filed on March 01, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TXNM TXNM ENERGY INC Stock $txnm

2020 Q4 Form 10-K Financial Statement

#000110842621000010 Filed on March 01, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TXNM
TXNM ENERGY INC Stock $txnm