County annual report · FIPS 25001
2021 Barnstable County, MA Power Outage Report
In 2021, customers in Barnstable County, MA went without power for an average of 49.7 hours, a total of 5.9M customer-hours (Massachusetts average 7.4 hours). That ranks 1st worst of 14 Massachusetts counties and 182nd 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 Barnstable 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 | October 26, 2021 13:00 | October 28, 2021 15:30 | 2d 2h | 273,634 | 3.7M |
| 2 | October 28, 2021 20:30 | November 1, 2021 06:45 | 3d 10h | 92,294 | 1.9M |
| 3 | July 9, 2021 04:45 | July 10, 2021 22:45 | 1d 18h | 12,324 | 55K |
| 4 | February 7, 2021 21:00 | February 8, 2021 23:45 | 1d 2h | 8,419 | 48K |
| 5 | December 26, 2021 03:00 | December 26, 2021 05:15 | 2h 15m | 7,502 | 15K |
| 6 | January 2, 2021 12:15 | January 2, 2021 17:00 | 4h 45m | 6,905 | 10K |
| 7 | November 13, 2021 14:30 | November 14, 2021 19:00 | 1d 4h | 5,813 | 23K |
| 8 | December 16, 2021 12:30 | December 16, 2021 13:00 | 30m | 5,795 | 1,620 |
| 9 | January 10, 2021 16:00 | January 10, 2021 17:15 | 1h 15m | 4,683 | 5,852 |
| 10 | February 21, 2021 16:30 | February 21, 2021 18:30 | 2h | 4,045 | 1,469 |
Outage episodes by size in 2021: 140 reached 100+ customers, 36 reached 1,000+ customers, 3 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 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 |
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 ÷ 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, 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/barnstable-county