County annual report · FIPS 25017
2023 Middlesex County, MA Power Outage Report
In 2023, customers in Middlesex County, MA went without power for an average of 7.5 hours, a total of 3.3M customer-hours (Massachusetts average 5.1 hours). That ranks 6th worst of 14 Massachusetts counties and 1083rd of 2,977 nationally.
Compared with MA, the US and 2022
Coverage line is EAGLE-I's share of Massachusetts customers tracked each year.
Biggest outages in Middlesex County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 18, 2023 07:45 | December 22, 2023 09:30 | 4d 1h | 85,579 | 1.3M |
| 2 | September 7, 2023 00:30 | September 17, 2023 19:15 | 10d 18h | 30,603 | 512K |
| 3 | March 14, 2023 07:15 | March 17, 2023 10:00 | 3d 2h | 11,860 | 215K |
| 4 | March 23, 2023 12:15 | April 3, 2023 09:15 | 10d 21h | 11,306 | 139K |
| 5 | June 19, 2023 08:30 | June 20, 2023 10:00 | 1d 1h | 8,746 | 12K |
| 6 | April 3, 2023 11:30 | April 21, 2023 00:00 | 17d 12h | 6,551 | 146K |
| 7 | August 25, 2023 08:15 | August 26, 2023 02:15 | 18h | 6,249 | 8,757 |
| 8 | December 24, 2023 20:45 | December 25, 2023 05:30 | 8h 45m | 5,620 | 6,343 |
| 9 | June 1, 2023 12:00 | June 4, 2023 01:45 | 2d 13h | 5,442 | 32K |
| 10 | January 23, 2023 00:00 | January 27, 2023 14:30 | 4d 14h | 5,322 | 109K |
Outage episodes by size in 2023: 275 reached 100+ customers, 103 reached 1,000+ customers, 4 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 Middlesex County reported on EIA Form 861 for 2023, 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 | 2023 | 5.8 hrs | 1.16 | 1.6 hrs | 0.84 |
| NSTAR Electric Company | 2023 | 3.2 hrs | 0.88 | 76 min | 0.67 |
| Unitil Energy Systems | 2023 | 4.3 hrs | 1.55 | 1.5 hrs | 0.89 |
| Fitchburg Gas & Elec Light Co | 2023 | 16.9 hrs | 2.45 | 1.5 hrs | 1.21 |
| Town of Reading - (MA) | 2023 | 37 min | 0.34 | 26 min | 0.30 |
| Town of Belmont - (MA) | 2018 | 57 min | 0.53 | 57 min | 0.53 |
| Massachusetts Bay Trans Authority | - | - | - | - | - |
| Town of Concord - (MA) | - | - | - | - | - |
| Town of Groton - (MA) | - | - | - | - | - |
| Town of Hudson - (MA) | - | - | - | - | - |
| Town of Littleton - (MA) | - | - | - | - | - |
| Town of Wakefield - (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 n/a of Massachusetts's customers in 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 434,426 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. Middlesex County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Middlesex County, MA annual power outage report, 2023, 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/2023/massachusetts/middlesex-county