County annual report · FIPS 25005
2021 Bristol County, MA Power Outage Report
In 2021, customers in Bristol County, MA went without power for an average of 6.3 hours, a total of 1.8M customer-hours (Massachusetts average 7.4 hours). That ranks 6th worst of 14 Massachusetts counties and 1110th 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 Bristol 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 27, 2021 00:30 | October 28, 2021 15:30 | 1d 15h | 105,218 | 1.2M |
| 2 | October 28, 2021 20:30 | November 2, 2021 03:45 | 4d 7h | 20,256 | 304K |
| 3 | September 2, 2021 02:15 | September 3, 2021 07:30 | 1d 5h | 12,438 | 19K |
| 4 | June 30, 2021 10:15 | July 2, 2021 04:30 | 1d 18h | 6,792 | 24K |
| 5 | December 27, 2021 05:15 | December 27, 2021 16:00 | 10h 45m | 6,526 | 15K |
| 6 | March 2, 2021 04:30 | March 3, 2021 11:30 | 1d 7h | 5,081 | 30K |
| 7 | August 22, 2021 09:30 | August 23, 2021 19:15 | 1d 9h | 4,612 | 14K |
| 8 | July 8, 2021 22:15 | July 9, 2021 00:15 | 2h | 4,379 | 3,362 |
| 9 | February 1, 2021 21:15 | February 2, 2021 16:15 | 19h | 3,087 | 9,740 |
| 10 | March 30, 2021 00:30 | March 30, 2021 03:15 | 2h 45m | 3,083 | 2,016 |
Outage episodes by size in 2021: 159 reached 100+ customers, 38 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 Bristol 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 |
| City of Taunton | 2021 | 5.7 hrs | 5.32 | 5.7 hrs | 5.32 |
| Town of Mansfield - (MA) | 2021 | 2 min | 0.03 | 2 min | 0.03 |
| Town of North Attleborough - (MA) | 2021 | 51 min | 0.69 | 30 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 99% of Massachusetts's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 284,254 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. Bristol County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Bristol 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/bristol-county