County annual report · FIPS 25025
2021 Suffolk County, MA Power Outage Report
In 2021, customers in Suffolk County, MA went without power for an average of 0.6 hours, a total of 605K customer-hours (Massachusetts average 7.4 hours). That ranks 14th worst of 14 Massachusetts counties and 2777th of 2,974 nationally.
Compared with MA, the US and 2020
Coverage line is EAGLE-I's share of Massachusetts customers tracked each year.
Biggest outages in Suffolk County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 3, 2021 22:30 | March 4, 2021 06:45 | 8h 15m | 8,264 | 3,113 |
| 2 | October 26, 2021 16:30 | October 28, 2021 15:30 | 1d 23h | 5,804 | 72K |
| 3 | July 5, 2021 14:30 | July 6, 2021 16:00 | 1d 1h | 4,513 | 13K |
| 4 | July 7, 2021 23:45 | July 10, 2021 19:45 | 2d 20h | 4,178 | 10K |
| 5 | August 17, 2021 19:30 | August 18, 2021 01:30 | 6h | 3,740 | 1,784 |
| 6 | October 12, 2021 07:30 | October 12, 2021 09:15 | 1h 45m | 3,590 | 4,817 |
| 7 | February 7, 2021 04:15 | February 7, 2021 13:00 | 8h 45m | 3,344 | 7,360 |
| 8 | June 29, 2021 14:15 | July 5, 2021 13:30 | 5d 23h | 3,178 | 41K |
| 9 | April 2, 2021 14:00 | April 3, 2021 09:00 | 19h | 3,066 | 6,230 |
| 10 | July 26, 2021 21:30 | July 29, 2021 10:00 | 2d 12h | 2,489 | 19K |
Outage episodes by size in 2021: 280 reached 100+ customers, 42 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Suffolk County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Massachusetts Electric Co | 2021 | 7.9 hrs | 1.26 | 1.6 hrs | 0.94 |
| NSTAR Electric Company | 2021 | 10.7 hrs | 1.10 | 76 min | 0.73 |
| Massachusetts Bay Trans Authority | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 99% of Massachusetts's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 947,211 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Suffolk County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Suffolk County, MA annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/massachusetts/suffolk-county