NSTAR Electric Company electricity rates
Investor-owned utility · Massachusetts · ISONE
NSTAR Electric Company is a for-profit, investor-owned utility regulated by the state utility commission, serving 306,795 homes in Massachusetts. Its residential customers pay an average of 19.62¢/kWh including fixed and delivery charges, 9% more than the U.S. average.
Rate basis: EIA-861M monthly utility data, 12 months ending 2026-07.
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NSTAR Electric Company bill estimates
| Monthly use | At average all-in rate | Base tariff charges* |
|---|---|---|
| 500 kWh | $98.10 | $133.60 |
| 1,000 kWh | $196.20 | $259.70 |
| 1,500 kWh | $294.30 | $385.80 |
| 2,000 kWh | $392.40 | $511.90 |
*Greater Boston Residential R-1 (A1) (effective 2026-02-01, $7.50/month customer charge), energy and fixed charges from the OpenEI Utility Rate Database. Riders, fuel adjustments and taxes are often billed separately, so real bills usually land closer to the all-in column. Calculate your bill.
NSTAR Electric Company residential rate plans
Source: OpenEI U.S. Utility Rate Database. Rates change. Check the linked tariff or your bill for current figures.
NSTAR Electric Company rate history
2015–2025: +2% change in the average residential rate (21.13¢ → 21.49¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | NSTAR Electric Company | Massachusetts avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 113 | 121 | 266 |
| Outages per customer (SAIFI) | 0.81 | 0.92 | 1.34 |
| Average restoration time (CAIDI) | 2 hr 21 min | — | — |
| Outage minutes excluding major storms | 66 | 74 | 121 |
Outages in counties served (2025)
From ORNL EAGLE-I, which tracks customers without power every 15 minutes. These counts cover every utility in each county. Weighted across NSTAR Electric Company's counties, customers averaged 2 hr 22 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Barnstable | 252 | 72 | 24,294 | 2025-05-31 |
| Middlesex | 238 | 64 | 19,321 | 2025-12-19 |
| Hampshire | 208 | 54 | 8,149 | 2025-05-04 |
| Norfolk | 188 | 46 | 29,004 | 2025-12-19 |
| Franklin | 178 | 42 | 10,330 | 2025-01-17 |
| Berkshire | 175 | 47 | 10,881 | 2025-09-06 |
| Hampden | 165 | 36 | 20,087 | 2025-07-27 |
| Plymouth | 142 | 44 | 47,121 | 2025-07-04 |
| Bristol | 135 | 47 | 38,360 | 2025-07-04 |
| Dukes | 88 | 24 | 10,157 | 2025-07-10 |
| Suffolk | 53 | 11 | 27,817 | 2025-05-14 |
NSTAR Electric Company service area
NSTAR Electric Company serves 11 counties in Massachusetts and 347 ZIP codes.
Barnstable, Berkshire, Bristol, Dukes, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk
Cities: Boston, Springfield, Cambridge, New Bedford, Dorchester, Fall River, Quincy, Newton, Somerville, Framingham, Framingham Center, Waltham, Brookline, Medford, North Chicopee, Revere, Barnstable, Everett, Brighton, Pittsfield, East Boston, Arlington, Billerica, Amherst, Marlborough, Woburn, Chelsea, Mattapan, Chelmsford, Natick, Randolph, Watertown, Hyde Park, Lexington, Franklin, West Roxbury, Ashmont, Tewksbury, Needham, Allston
Programs, smart meters & solar
| Smart meters (AMI) for homes | 0% |
| Time-based rate programs | None reported |
| Net-metered solar homes | 89,526 |
| Home batteries paired with solar | 2,468 |
| Residential efficiency incentives paid (2025) | $143,971,230 |
| Residential energy saved by programs | 11,676 MWh |
NSTAR Electric Company at a glance
| Ownership | Investor-owned utility |
| Services | Generation, Transmission, Distribution, Wholesale Marketing, Retail Marketing |
| Commercial rate | 17.66¢/kWh |
| Industrial rate | 23.09¢/kWh |
| Retail revenue (2025) | $528,713,000 |
| Electricity sold (2025) | 2,598,403 MWh |
| Peak demand | 5,109 MW summer · 3,692 MW winter |
| Power from own generation | 1% (rest purchased) |
| Line losses | 12.0% |
| Balancing authority | ISNE |
| EIA utility ID | 54913 |
| Website | www.masssavedata.com |
Other utilities in Massachusetts
Frequently asked questions
What is NSTAR Electric Company's electricity rate?
NSTAR Electric Company residential customers pay an average of 19.62¢ per kWh, all charges included (EIA-861M monthly utility data, 12 months ending 2026-07). That's 36% below the Massachusetts average of 30.43¢ and 9% above the U.S. average.
What is the average NSTAR Electric Company electric bill?
About $93 a month. The average NSTAR Electric Company home uses 474 kWh a month. At 1,000 kWh the bill would be about $196.
How many customers does NSTAR Electric Company have?
NSTAR Electric Company serves 306,795 residential customers and 1,483,524 customers in total in Massachusetts, across 11 counties.
How reliable is NSTAR Electric Company?
In 2025, the average NSTAR Electric Company customer was without power for 113 min (SAIDI) over 0.81 interruptions (SAIFI), including major storms. Excluding major event days it was 66 min. The Massachusetts average was 2 hr 1 min and the U.S. average 4 hr 26 min.
Does NSTAR Electric Company offer net metering for solar?
NSTAR Electric Company had 89,526 residential net-metered customers in 2025 with 651.7 MW of capacity and 2,468 solar-paired batteries. Estimate solar savings at this utility's rate.
Sources: EIA-861 2025 and EIA-861M (through July 2026), OpenEI URDB, ORNL EAGLE-I, U.S. Census. Methodology. Spot an error? Rates change often, so confirm with NSTAR Electric Company before making decisions.