NSTAR Electric Company
Investor Owned electric utility · Massachusetts · #114 of 3,199 U.S. utilities by customers · EIA utility #54913
NSTAR Electric Company is a investor owned electric utility serving 340,640 customers in Massachusetts. In 2025 it sold 2,598 gigawatt-hours of electricity for $528.71M in revenue, an average realized rate of 20.35¢ per kWh across all customer classes and 21.49¢ per kWh for residential customers. Its reported service territory covers 11 counties. EIA records its activities as: generation, transmission, buying transmission, distribution, wholesale marketing, retail marketing.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 306,795 | 1,745 | $374.99M | 21.49¢ | |
| Commercial | 33,547 | 803 | $142.13M | 17.69¢ | |
| Industrial | 298 | 50.1 | $11.59M | 23.13¢ | |
| Total | 340,640 | 2,598 | $528.71M | 20.35¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (474 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 511,327 | 4,366 | $990.39M | 24.25¢ |
| 2022 | 487,098 | 3,876 | $1.08B | 29.31¢ |
| 2023 | 463,946 | 3,563 | $1.03B | 29.66¢ |
| 2024 | 429,119 | 2,990 | $867.59M | 29.91¢ |
| 2025 | 340,640 | 2,598 | $528.71M | 21.49¢ |
Reliability (2025)
Average outage time (SAIDI): 113 minutes per customer per year
Average outages (SAIFI): 0.81 per customer
Average restoration time (CAIDI): 141 minutes
As reported for Massachusetts under the IEEE standard, with major event days included where the standard reports them. Lower is better; see the reliability rankings.
Energy supply (2025)
Net generation: 67.5 GWh
Wholesale power purchased: 5,275 GWh
Winter peak demand: 3,692 MW
Energy losses: 19.8% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 0.0% of 1,757,578 meters
Customer-sited generation (net metering): 93,751 installations, 1,566.9 MW of capacity
This utility also reported 1,142,884 delivery-only customers (20,812 GWh delivered) in 2025. Delivery figures are excluded from the totals above because the same electricity is also reported by the energy supplier - see Methodology.
Counties served
Barnstable, MABerkshire, MABristol, MADukes, MAFranklin, MAHampden, MAHampshire, MAMiddlesex, MANorfolk, MAPlymouth, MASuffolk, MA
Other large utilities in Massachusetts
- Constellation NewEnergy, Inc - 1,541,139 customers, residential 12.92¢
- Direct Energy Services - 1,310,067 customers, residential 14.56¢
- Massachusetts Electric Co - 486,042 customers, residential 33.66¢
- First Point Power, LLC - 353,137 customers, residential 13.82¢
- Clearview Electric Inc. - 64,976 customers, residential 14.61¢
- City of Taunton - (MA) - 40,045 customers, residential 18.81¢
- Town of Reading - (MA) - 28,337 customers, residential 19.95¢
- City of Peabody - (MA) - 27,251 customers, residential 16.88¢
All Massachusetts utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #54913 in the EIA frame.