NSAROOTCElectric ServicesUS GAAP · USD

Nstar Electric Co

NSTAR Electric Co. is a regulated electric utility serving customers in Massachusetts as part of the Eversource Energy group. Its business centers on the delivery of electricity through transmission and distribution networks, with revenues driven by regulated service to residential, commercial, and industrial users.

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Business

Share of revenue
Electric distribution service70 %

Delivery of electricity to end users over local distribution networks.

Electric transmission service20 %

High-voltage transmission of power through regulated network assets.

Customer and utility services10 %

Metering, billing, service connections, and outage response support.

Customers

The company serves a broad base of regulated electric customers in Massachusetts, including households, businesses, and industrial users. Demand is driven by essential electricity delivery rather than discretionary purchasing, so customer relationships are tied to service territory and regulated utility obligations.

Residential customers

Households in the service territory that buy electric delivery and related utility services for everyday power needs.

Commercial customers

Retail, office, and service businesses that need reliable electricity and predictable utility service.

Industrial customers

Larger power users that purchase regulated electric delivery and depend on service reliability.

Regulated energy counterparties

Energy marketers, utilities, and suppliers involved in long-term or high-volume supply contracts and collateralized transactions.

Strategy

The company’s strategic focus is to operate a reliable regulated electric network and recover costs through approved rates. It also manages market and credit exposures tied to energy contracting, while maintaining a capital structure and debt profile suited to utility regulation.

Reliability and grid operationsShort term

Utility performance depends on dependable service and rapid restoration in a regulated monopoly model.

Regulatory recovery of costs and returnsMedium term

Allowed rates and ROE determine the economics of the regulated utility model.

Risk management for energy and credit exposuresShort term

Contracting with suppliers and market participants creates counterparty and settlement risk even in a regulated business.

Geography

NSTAR Electric Co. operates in the United States, with its core service territory in Massachusetts. Its business is geographically concentrated, so local regulation, weather, load growth, and regional grid conditions have an outsized effect on operations and earnings.

Risks

The main risks come from regulation, including allowed-return disputes and the possibility that regulators or courts set less favorable ROEs. As a utility, the company also faces operational risks from storms, outages, and infrastructure failures, plus credit and contract risks tied to energy transactions and counterparties.

Sorted by severity
LowMediumHighLowMediumHighImpact →Likelihood →FERC ROE complaint and refund exposure1Regulatory rate-setting risk2
Impact is the risk’s severity and likelihood how probable it is over the next few years, both assessed from the company’s reports. Numbers match the list.
  1. FERC ROE complaint and refund exposureImpact: HighLikelihood: High

    Transmission-owning utilities in ISO-NE have faced complaints over allowed returns, and adverse orders can require retroactive refunds.

    Exposure: Refund obligations and lower future allowed returns

  2. Regulatory rate-setting riskImpact: HighLikelihood: High

    Revenue and profitability depend on state and federal approval of rates and recovery mechanisms.

    ExposureAllowed ROERate base recoveryTiming of cost recovery
  3. Operational outage and weather riskImpact: Medium

    Electric utilities must maintain and restore service across a physical network exposed to storms and equipment failures.

    ExposureRestoration costsService interruptionsReliability penalties
  4. Counterparty credit riskImpact: Medium

    Energy contracts and margin accounts expose the company to non-performance by suppliers and market participants.

    ExposureLetters of creditCash collateralSettlement balances
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Accounting

Judgemental items
Regulatory accounting

Utility costs and returns may be deferred or recovered through future rates, affecting earnings timing and balance sheet composition.

Impact: Regulatory assets and liabilities

Contingent liabilities for FERC ROE refunds

Adverse regulatory orders can create material refund obligations that must be estimated and accrued.

Impact: Earnings, cash flows, and liabilities

Energy contract collateral and margin accounts

Collateral posted or received for energy transactions affects liquidity and balance sheet presentation.

Impact: Cash, receivables, and payables

Debt and interest expense presentation

Fixed-rate long-term debt reduces fair value volatility but still drives interest expense and refinancing disclosures.

Impact: Interest expense and debt footnotes

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Last updated: 24/09/2026