How reliable is the power in Massachusetts?
Massachusetts ranks 12th of 45 states without major events and 6th with them (1st = fewest minutes), 52 below the U.S. 129 and 557 below the U.S. 662. Major events added 28 minutes, 26% of the with-events total. The figure covers 3,016,967 customers, 90% of the 3,343,560 EIA lists for Massachusetts.
Massachusetts with and without major events
minutes without power per customer, 2024, Massachusetts and U.S.
- 77Massachusetts, no major events
- 129U.S., no major events
- 104Massachusetts, with major events
- 662U.S., with major events
| Measure | Massachusetts without | Massachusetts with | U.S. without | U.S. with |
|---|---|---|---|---|
| SAIDI, minutes per customer | 77 | 104 | 129 | 662 |
| SAIFI, interruptions per customer | 0.75 | 0.86 | 1.06 | 1.53 |
| CAIDI, minutes per interruption | 103 | 122 | 122 | 433 |
| Median utility, SAIDI minutes | 48 | 64 | — | — |
Which Massachusetts utilities move the number
Massachusetts Electric Co serves 45% of the customers in the Massachusetts figure: 57% of lost customer-minutes with major events, 53% without. Without Massachusetts Electric Co, the weighted figure would be 81 minutes with major events and 66 without, against 104 and 77.
- Massachusetts Electric Co: 1,345,044 customers (45%), 91 min without and 134 with; 57% of lost minutes with major events, 53% without.
- NSTAR Electric Company: 1,462,127 customers (48%), 66 min without and 81 with; 37% of lost minutes with major events, 42% without.
- City of Taunton: 39,242 customers (1%), 193 min without and 193 with; 2% of lost minutes with major events, 3% without.
All Massachusetts utilities in the 2024 file
55 utilities in the 2024 EIA-861 files for Massachusetts: 13 follow IEEE 1366, 5 use another method, 37 filed no reliability figures. 18 are listed.
| Town of Braintree - (MA) | Municipal | IEEE 1366 | 16,598 | 3 | 3 | 0.04 | 0.04 | 0 | 1 of 12 | — |
|---|---|---|---|---|---|---|---|---|---|---|
| Town of North Attleborough - (MA) | Municipal | IEEE 1366 | 13,894 | 6 | 6 | 0.09 | 0.09 | 0 | 2 of 12 | — |
| Town of Mansfield - (MA) | Municipal | IEEE 1366 | 10,504 | 10 | 16 | 0.10 | 0.12 | 37 | 3 of 12 | — |
| Town of Reading - (MA) | Municipal | IEEE 1366 | 32,638 | 23 | 46 | 0.27 | 0.66 | 50 | 4 of 12 | — |
| City of Norwood - (MA) | Municipal | IEEE 1366 | 16,301 | 25 | 64 | 0.46 | 0.85 | 61 | 5 of 12 | — |
| City of Westfield - (MA) | Municipal | IEEE 1366 | 18,194 | 46 | 123 | 1.00 | 1.74 | 62 | 6 of 12 | — |
| Nantucket Electric Co | Investor Owned | IEEE 1366 | 13,995 | 50 | 138 | 0.33 | 0.72 | 64 | 7 of 12 | — |
| City of Holyoke - (MA) | Municipal | IEEE 1366 | 17,557 | 62 | 62 | 1.26 | 1.26 | 0 | 8 of 12 | — |
| Fitchburg Gas & Elec Light Co | Investor Owned | IEEE 1366 | 30,873 | 65 | 65 | 1.05 | 1.05 | 0 | 9 of 12 | — |
| NSTAR Electric Company | Investor Owned | IEEE 1366 | 1,462,127 | 66 | 81 | 0.64 | 0.69 | 18 | 10 of 12 | — |
| Massachusetts Electric Co | Investor Owned | IEEE 1366 | 1,345,044 | 91 | 134 | 0.84 | 1.00 | 32 | 11 of 12 | — |
| City of Taunton | Municipal | IEEE 1366 | 39,242 | 193 | 193 | 2.37 | 2.37 | 0 | 12 of 12 | — |
| City of Chicopee - (MA) | Municipal | IEEE 1366 | 26,049 | — | 11 | — | 0.21 | — | Not ranked | — |
| Town of Middleborough - (MA) | Municipal | Other method | 16,991 | 19 | 19 | 0.66 | 0.66 | — | Not ranked | other method, not comparable |
| Town of Shrewsbury - (MA) | Municipal | Other method | 16,986 | 17 | 17 | 0.36 | 0.36 | — | Not ranked | other method, not comparable |
| Town of Hudson - (MA) | Municipal | Other method | 13,515 | 72 | 77 | 0.93 | 1.14 | — | Not ranked | other method, not comparable |
| Town of Danvers | Municipal | Other method | 13,425 | 18 | 18 | 0.10 | 0.10 | — | Not ranked | other method, not comparable |
| Town of Wellesley - (MA) | Municipal | Other method | 10,661 | — | 8 | — | 0.13 | — | Not ranked | other method, not comparable |
Massachusetts utilities with no reliability figures
37 in the sales file, no SAIDI or SAIFI row; the 25 largest are listed.
| Utility | Type | Customers |
|---|---|---|
| Sunrun Inc. | Behind the Meter | 57,153 |
| City of Peabody - (MA) | Municipal | 27,086 |
| Tesla Inc. | Behind the Meter | 19,273 |
| Town of Littleton - (MA) | Municipal | 7,596 |
| TerraForm US Energy Services, LLC | Behind the Meter | 24 |
| Greenbacker Renewable Energy Corporation | Behind the Meter | 20 |
| Greenskies Renewable Energy, LLC | Behind the Meter | 2 |
| Town of Marblehead - (MA) | Municipal | — |
| City of Hingham - (MA) | Municipal | — |
| First Point Power, LLC | Not stated | — |
| Town of Georgetown - (MA) | Municipal | — |
| Town of Holden - (MA) | Municipal | — |
| Town of South Hadley - (MA) | Municipal | — |
| Hull Municipal Light Plant | Municipal | — |
| Cape Light Compact | Not stated | — |
| Constellation NewEnergy, Inc | Not stated | — |
| Town of Paxton - (MA) | Municipal | — |
| Town of Ashburnham - (MA) | Municipal | — |
| City of Russell - (MA) | Municipal | — |
| Town of Ipswich - (MA) | Municipal | — |
| Town of Wakefield - (MA) | Municipal | — |
| Town of Sterling - (MA) | Municipal | — |
| Town of Boylston - (MA) | Municipal | — |
| Town of Middleton - (MA) | Municipal | — |
| Texas Retail Energy, LLC | Not stated | — |
The biggest Massachusetts utilities against the U.S.
- NSTAR Electric Company (investor owned, 46% of Massachusetts customers in the file): SAIDI without major events 66 min, 63 below the U.S. 129; with major events 81 min against 662.
- Massachusetts Electric Co (investor owned, 41% of Massachusetts customers in the file): SAIDI without major events 91 min, 39 below the U.S. 129; with major events 134 min against 662.
- Sunrun Inc. (behind the meter, 2% of Massachusetts customers in the file): no reliability figures filed.
- City of Taunton (municipal, 1% of Massachusetts customers in the file): SAIDI without major events 193 min, 64 above the U.S. 129; with major events 193 min against 662.
- Fitchburg Gas & Elec Light Co (investor owned, 1% of Massachusetts customers in the file): SAIDI without major events 65 min, 65 below the U.S. 129; with major events 65 min against 662.
Massachusetts by type of utility
Among Massachusetts utilities that report under IEEE 1366, municipal utilities average 66 minutes without major events and investor owned utilities 78.
| Type | Utilities | Customers | SAIDI without | Median utility | SAIDI with |
|---|---|---|---|---|---|
| Investor Owned | 4 | 2,852,039 | 78 | 65 | 106 |
| Municipal | 8 | 164,928 | 66 | 24 | 83 |
Next to Massachusetts in the ranking
Massachusetts report card
Smart meters: 13% of residential meters, 14 utilities (U.S. 92%). Massachusetts time-based rates: 1 of 17 utilities, 0.0% of residential customers enrolled (U.S. 10.6%). Massachusetts efficiency spend: $128.5 per customer (U.S. $124.2). Demand response: 28 W per customer (U.S. 77). Massachusetts net-metered systems: 58.9 per 1,000 customers. Rankings.
Is your Massachusetts utility better or worse than the Massachusetts median?
- Loading.
More
- Massachusetts against all states
- Massachusetts utilities among the best and worst
- Massachusetts utility reliability and price by company
- Massachusetts major outage reports from the Department of Energy
- Massachusetts electricity prices
- Massachusetts help with your bill
18 Massachusetts filings in EIA-861 2024 (retrieved 2026-10-01), 12 ranked utilities. Method and sources.
Questions
How many minutes without power did the average Massachusetts customer have in 2024?
77 minutes without major events and 104 with them (13 IEEE 1366 utilities, customer-weighted).
Why do the two Massachusetts numbers differ so much?
Major events add 28 of the 104 minutes (26%); Massachusetts Electric Co supplies 57% of the with-events total.
Which Massachusetts utility reported the fewest and the most minutes?
Among 12 utilities with 10,000+ customers: Town of Braintree - (MA) 3 minutes without major events, and City of Taunton 193.
Which Massachusetts utilities use which method?
13 follow IEEE 1366, 5 use another method, 37 filed no reliability figures.