County annual report · FIPS 25017
2024 Middlesex County, MA Power Outage Report
In 2024, customers in Middlesex County, MA went without power for an average of 3.0 hours, a total of 1.3M customer-hours (Massachusetts average 1.9 hours). That ranks 5th worst of 14 Massachusetts counties and 2110th of 2,990 nationally.
Compared with MA, the US and 2023
Coverage line is EAGLE-I's share of Massachusetts customers tracked each year.
Biggest outages in Middlesex County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 7, 2024 07:00 | January 12, 2024 22:15 | 5d 15h | 16,414 | 272K |
| 2 | August 12, 2024 08:00 | September 8, 2024 22:00 | 27d 14h | 10,049 | 83K |
| 3 | June 25, 2024 11:30 | August 7, 2024 01:15 | 42d 13h | 9,070 | 211K |
| 4 | April 3, 2024 17:45 | April 6, 2024 03:45 | 2d 10h | 8,471 | 51K |
| 5 | February 28, 2024 05:30 | March 1, 2024 09:30 | 2d 4h | 5,854 | 55K |
| 6 | September 8, 2024 23:00 | October 8, 2024 23:45 | 30d | 4,562 | 44K |
| 7 | December 16, 2024 08:30 | December 21, 2024 04:15 | 4d 19h | 4,260 | 18K |
| 8 | August 11, 2024 10:30 | August 12, 2024 00:00 | 13h 30m | 3,982 | 4,233 |
| 9 | January 2, 2024 13:00 | January 3, 2024 02:00 | 13h | 3,848 | 4,926 |
| 10 | June 23, 2024 06:45 | June 24, 2024 01:15 | 18h 30m | 3,715 | 4,652 |
Outage episodes by size in 2024: 174 reached 100+ customers, 68 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 Middlesex County reported on EIA Form 861 for 2024, 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 | 2024 | 2.2 hrs | 1.00 | 1.5 hrs | 0.84 |
| NSTAR Electric Company | 2024 | 81 min | 0.69 | 66 min | 0.64 |
| Unitil Energy Systems | 2024 | 9.9 hrs | 1.73 | 1.6 hrs | 1.00 |
| Fitchburg Gas & Elec Light Co | 2024 | 65 min | 1.05 | 65 min | 1.05 |
| Town of Reading - (MA) | 2024 | 46 min | 0.66 | 23 min | 0.27 |
| 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 2024; 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, 2024, 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/2024/massachusetts/middlesex-county