NSTAR Electric Company (NSARO) is a regulated electric utility that distributes electricity to customers in Massachusetts. It makes money by charging tariff-based rates for electricity distribution, with rates set by state regulators. NSTAR Electric is a wholly owned subsidiary of Eversource Energy, which also owns The Connecticut Light and Power Company and Public Service Company of New Hampshire. As of January 31, 2026, all outstanding common stock of NSTAR Electric Company ($1.00 par value) is held by Eversource Energy. The company files its annual report on Form 10-K jointly with Eversource Energy and its other regulated utility subsidiaries, reflecting its position as a reporting subsidiary rather than a publicly traded independent entity. Because NSTAR Electric meets the conditions set forth in General Instruction I(1)(a) and (b) of Form 10-K, it files on a reduced-disclosure basis.

Revenue model

Regulated electric distribution utility. Revenue is generated through tariff-based rates approved by state regulators for delivering electricity to end customers.

Products and services

Electric distribution service in Massachusetts.

Customers and end markets

End customers receiving electric distribution service in Massachusetts. Specific customer counts and segment breakdowns are not supported by the filing excerpts provided.

Value-chain role

Regulated electric distribution utility; operates as a wholly owned subsidiary within the Eversource Energy holding company structure.

Geographic exposure

Massachusetts (electric distribution).

Source: SEC 10-K, filed 2026-02-17

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