County annual report · FIPS 25019
2025 Nantucket County, MA Power Outage Report
In 2025, customers in Nantucket County, MA went without power for an average of 52.3 hours, a total of 36K customer-hours (Massachusetts average 2.8 hours). That ranks 1st worst of 14 Massachusetts counties and 73rd 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 Nantucket 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 | November 17, 2025 19:00 | November 17, 2025 21:15 | 2h 15m | 1,860 | 1,367 |
| 2 | March 17, 2025 19:00 | March 17, 2025 20:15 | 1h 15m | 1,604 | 909 |
| 3 | May 22, 2025 21:30 | May 22, 2025 22:30 | 1h | 1,590 | 1,588 |
| 4 | August 30, 2025 22:30 | August 31, 2025 00:00 | 1h 30m | 1,469 | 1,110 |
| 5 | June 10, 2025 18:45 | June 11, 2025 01:00 | 6h 15m | 1,454 | 3,823 |
| 6 | May 4, 2025 21:00 | May 5, 2025 03:00 | 6h | 754 | 1,039 |
| 7 | October 22, 2025 14:00 | October 23, 2025 01:30 | 11h 30m | 741 | 4,087 |
| 8 | July 24, 2025 00:15 | July 24, 2025 10:00 | 9h 45m | 708 | 2,236 |
| 9 | October 15, 2025 14:15 | October 15, 2025 18:00 | 3h 45m | 659 | 2,087 |
| 10 | March 8, 2025 17:45 | March 9, 2025 00:30 | 6h 45m | 632 | 2,543 |
Outage episodes by size in 2025: 29 reached 100+ customers, 5 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 Nantucket 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 |
| Nantucket Electric Co | 2024 | 2.3 hrs | 0.72 | 50 min | 0.33 |
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 ÷ 680 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. Nantucket County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Nantucket 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/nantucket-county