County annual report · FIPS 25021
2021 Norfolk County, MA Power Outage Report
In 2021, customers in Norfolk County, MA went without power for an average of 8.7 hours, a total of 2.8M customer-hours (Massachusetts average 7.4 hours). That ranks 5th worst of 14 Massachusetts counties and 879th 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 Norfolk 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 10:15 | October 28, 2021 15:30 | 2d 5h | 126,740 | 1.7M |
| 2 | October 28, 2021 20:30 | November 2, 2021 07:30 | 4d 11h | 23,696 | 676K |
| 3 | February 1, 2021 19:30 | February 3, 2021 08:45 | 1d 13h | 8,774 | 43K |
| 4 | February 15, 2021 08:00 | February 15, 2021 22:30 | 14h 30m | 8,307 | 39K |
| 5 | March 2, 2021 02:00 | March 4, 2021 09:15 | 2d 7h | 6,109 | 36K |
| 6 | April 15, 2021 23:15 | April 16, 2021 02:45 | 3h 30m | 5,840 | 15K |
| 7 | July 7, 2021 12:00 | July 11, 2021 15:30 | 4d 3h | 5,316 | 48K |
| 8 | June 30, 2021 20:45 | July 3, 2021 06:45 | 2d 10h | 4,297 | 17K |
| 9 | June 20, 2021 09:45 | June 21, 2021 01:30 | 15h 45m | 4,063 | 1,314 |
| 10 | February 7, 2021 21:00 | February 8, 2021 05:45 | 8h 45m | 3,996 | 5,348 |
Outage episodes by size in 2021: 213 reached 100+ customers, 33 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 Norfolk 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 Norwood - (MA) | 2021 | 1.8 hrs | 1.22 | 38 min | 0.46 |
| Town of Braintree - (MA) | 2021 | 56 min | 0.07 | 5 min | 0.06 |
| Massachusetts Bay Trans Authority | - | - | - | - | - |
| Town of Wellesley - (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 ÷ 326,357 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. Norfolk County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Norfolk 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/norfolk-county