County annual report · FIPS 25001
2025 Barnstable County, MA Power Outage Report
In 2025, customers in Barnstable County, MA went without power for an average of 4.2 hours, a total of 497K customer-hours (Massachusetts average 2.8 hours). That ranks 3rd worst of 14 Massachusetts counties and 1716th 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 Barnstable 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 31, 2025 09:15 | June 1, 2025 23:30 | 1d 14h | 24,294 | 111K |
| 2 | July 4, 2025 03:00 | July 4, 2025 03:30 | 30m | 21,935 | 11K |
| 3 | August 22, 2025 08:45 | August 23, 2025 01:15 | 16h 30m | 18,405 | 15K |
| 4 | May 22, 2025 12:30 | May 24, 2025 04:30 | 1d 16h | 16,358 | 36K |
| 5 | July 3, 2025 19:30 | July 4, 2025 02:00 | 6h 30m | 16,252 | 16K |
| 6 | August 8, 2025 16:15 | August 9, 2025 05:15 | 13h | 5,844 | 1,639 |
| 7 | August 18, 2025 02:15 | August 18, 2025 22:15 | 20h | 5,821 | 4,437 |
| 8 | July 8, 2025 10:00 | July 10, 2025 02:30 | 1d 16h | 5,438 | 26K |
| 9 | April 26, 2025 15:30 | April 26, 2025 21:45 | 6h 15m | 5,044 | 5,392 |
| 10 | May 28, 2025 06:15 | May 29, 2025 01:45 | 19h 30m | 4,832 | 2,996 |
Outage episodes by size in 2025: 177 reached 100+ customers, 42 reached 1,000+ customers, 5 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 Barnstable 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 |
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 ÷ 118,437 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. Barnstable County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Barnstable 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/barnstable-county