County annual report · FIPS 25017
2019 Middlesex County, MA Power Outage Report
In 2019, customers in Middlesex County, MA went without power for an average of 3.3 hours, a total of 1.4M customer-hours (Massachusetts average 3.0 hours). That ranks 7th worst of 14 Massachusetts counties and 1530th of 2,945 nationally.
Compared with MA, the US and 2018
Coverage line is EAGLE-I's share of Massachusetts customers tracked each year.
Biggest outages in Middlesex County, 2019
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 16, 2019 20:45 | October 21, 2019 07:30 | 4d 10h | 29,508 | 559K |
| 2 | February 25, 2019 08:45 | February 28, 2019 05:30 | 2d 20h | 20,451 | 332K |
| 3 | October 7, 2019 08:00 | October 10, 2019 00:15 | 2d 16h | 12,772 | 22K |
| 4 | September 25, 2019 02:15 | September 25, 2019 21:15 | 19h | 5,822 | 4,157 |
| 5 | October 30, 2019 12:45 | November 3, 2019 00:00 | 3d 11h | 4,952 | 37K |
| 6 | October 22, 2019 10:45 | October 23, 2019 05:45 | 19h | 4,715 | 9,155 |
| 7 | November 26, 2019 22:15 | November 27, 2019 21:30 | 23h 15m | 4,685 | 10K |
| 8 | August 29, 2019 19:45 | August 30, 2019 02:45 | 7h | 3,775 | 4,323 |
| 9 | August 7, 2019 18:15 | August 8, 2019 09:00 | 14h 45m | 3,609 | 4,415 |
| 10 | October 23, 2019 06:30 | October 25, 2019 11:00 | 2d 4h | 3,523 | 12K |
Outage episodes by size in 2019: 227 reached 100+ customers, 67 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 Middlesex County reported on EIA Form 861 for 2019, 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 | 2014 | 2.4 hrs | 1.12 | 1.6 hrs | 0.96 |
| NSTAR Electric Company | 2018 | 16.2 hrs | 1.68 | 85 min | 0.83 |
| Unitil Energy Systems | 2018 | 8.2 hrs | 1.94 | 1.9 hrs | 1.20 |
| Fitchburg Gas & Elec Light Co | 2018 | 2.3 hrs | 1.89 | 1.8 hrs | 1.57 |
| Town of Reading - (MA) | 2018 | 66 min | 0.53 | 19 min | 0.36 |
| 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 89% of Massachusetts's customers in 2019; 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, 2019, 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/2019/massachusetts/middlesex-county