Massachusetts · Investor Owned
NSTAR Electric Company
21.49¢ per kWh, bundled, EIA-861 2025. Average bill $101.86 at 474.0 kWh a month, across 306,795 customers on that row.
Massachusetts averaged 30.41¢/kWh and $181.08 a month. The United States averaged 17.23¢/kWh and $150.68. State and national figures come from EIA's Average Bill file.
Revenue divided by sales, EIA-861 Sales to Ultimate Customers, 2025, released October 7, 2026. Texas wires utilities come from the Delivery Companies file. The price and bill use bundled service. Customer count: 968,061, the largest residential count across service types.
Estimate a bill
The figure below is this utility's 2025 EIA residential average.
2025 EIA average
$214.90
21.49¢/kWh × 1,000 kWh. Bundled residential average, EIA-861 2025. The customer charge is already folded into this average, so it stands beside a tariff total rather than being added to it.
Other service rows
Delivery and bundled prices cover different charges, so they are listed separately.
| Row | ¢/kWh | Bill | kWh | Customers |
|---|---|---|---|---|
| Delivery only | 20.06¢ | $114.60 | 571.4 | 968,061 |
Annual history
| Year | ¢/kWh | Avg. bill | Avg. kWh | Customers |
|---|---|---|---|---|
| 2015 | 21.13¢ | $109.14 | 516.5 | 767,403 |
| 2016 | 20.18¢ | $105.91 | 524.8 | 629,868 |
| 2017 | 21.03¢ | $99.67 | 473.9 | 618,193 |
| 2018 | 23.06¢ | $125.08 | 542.4 | 620,731 |
| 2019 | 22.53¢ | $117.14 | 520.0 | 620,676 |
| 2020 | 22.39¢ | $119.06 | 531.7 | 599,660 |
| 2021 | 24.25¢ | $129.51 | 534.0 | 451,661 |
| 2022 | 29.31¢ | $138.22 | 471.7 | 432,255 |
| 2023 | 29.66¢ | $141.66 | 477.6 | 409,760 |
| 2024 | 29.91¢ | $137.02 | 458.1 | 383,373 |
| 2025 | 21.49¢ | $101.86 | 474.0 | 306,795 |
EIA-861, 2015–2025, using the same service type as the 2025 figure. A blank year means that service was not in the file.
Counties
Barnstable, Berkshire, Bristol, Dukes, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk.
EIA-861 Service Territory, 2025. A listed county is the county EIA recorded. It does not mean every address in the county is served. Open this utility in the bill calculator · Rate history tool