County annual report · FIPS 25023
2021 Plymouth County, MA Power Outage Report
In 2021, customers in Plymouth County, MA went without power for an average of 30.5 hours, a total of 8.6M customer-hours (Massachusetts average 7.4 hours). That ranks 2nd worst of 14 Massachusetts counties and 292nd 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 Plymouth 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 16:15 | October 28, 2021 15:30 | 1d 23h | 351,202 | 4.9M |
| 2 | October 28, 2021 20:30 | November 6, 2021 02:30 | 8d 6h | 125,477 | 3.4M |
| 3 | March 2, 2021 04:15 | March 3, 2021 00:30 | 20h 15m | 6,923 | 31K |
| 4 | June 30, 2021 20:15 | July 3, 2021 01:00 | 2d 4h | 5,942 | 16K |
| 5 | January 19, 2021 02:45 | January 19, 2021 17:00 | 14h 15m | 4,269 | 2,508 |
| 6 | May 11, 2021 16:45 | May 12, 2021 01:45 | 9h | 4,142 | 4,207 |
| 7 | July 25, 2021 08:15 | July 26, 2021 03:30 | 19h 15m | 3,871 | 4,196 |
| 8 | September 28, 2021 14:15 | September 28, 2021 20:00 | 5h 45m | 3,708 | 3,300 |
| 9 | February 1, 2021 22:00 | February 2, 2021 21:00 | 23h | 3,579 | 7,783 |
| 10 | July 9, 2021 11:45 | July 10, 2021 01:15 | 13h 30m | 3,452 | 5,285 |
Outage episodes by size in 2021: 175 reached 100+ customers, 51 reached 1,000+ customers, 2 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 Plymouth 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 Hingham - (MA) | - | - | - | - | - |
| Hull Municipal Light Plant | - | - | - | - | - |
| Town of Middleborough - (MA) | - | - | - | - | - |
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 ÷ 281,672 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. Plymouth County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Plymouth 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/plymouth-county