County annual report · FIPS 25025
2025 Suffolk County, MA Power Outage Report
In 2025, customers in Suffolk County, MA went without power for an average of 0.9 hours, a total of 834K customer-hours (Massachusetts average 2.8 hours). That ranks 14th worst of 14 Massachusetts counties and 2793rd of 3,000 nationally.
Compared with MA, the US and 2024
Coverage line is EAGLE-I's share of Massachusetts customers tracked each year.
Biggest outages in Suffolk County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 14, 2025 10:30 | May 15, 2025 13:30 | 1d 3h | 27,817 | 19K |
| 2 | July 29, 2025 17:15 | July 30, 2025 14:45 | 21h 30m | 18,010 | 37K |
| 3 | June 27, 2025 16:00 | June 28, 2025 14:30 | 22h 30m | 10,570 | 13K |
| 4 | June 23, 2025 14:30 | June 27, 2025 03:45 | 3d 13h | 10,041 | 99K |
| 5 | July 23, 2025 17:30 | July 25, 2025 06:45 | 1d 13h | 9,103 | 14K |
| 6 | June 17, 2025 14:15 | June 18, 2025 07:15 | 17h | 8,356 | 9,024 |
| 7 | June 20, 2025 12:45 | June 20, 2025 20:45 | 8h | 6,655 | 23K |
| 8 | June 19, 2025 14:15 | June 20, 2025 07:45 | 17h 30m | 5,689 | 5,618 |
| 9 | September 1, 2025 17:30 | September 1, 2025 22:30 | 5h | 5,546 | 8,032 |
| 10 | March 4, 2025 06:45 | March 5, 2025 04:30 | 21h 45m | 4,764 | 5,083 |
Outage episodes by size in 2025: 266 reached 100+ customers, 60 reached 1,000+ customers, 4 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 2025, 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 | 2024 | 2.2 hrs | 1.00 | 1.5 hrs | 0.84 |
| NSTAR Electric Company | 2024 | 81 min | 0.69 | 66 min | 0.64 |
| 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 n/a of Massachusetts's customers in 2025; 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, 2025, 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/2025/massachusetts/suffolk-county