County annual report · FIPS 25017
2017 Middlesex County, MA Power Outage Report
In 2017, customers in Middlesex County, MA went without power for an average of 7.8 hours, a total of 3.4M customer-hours (Massachusetts average 4.7 hours). That ranks 4th worst of 14 Massachusetts counties and 679th of 2,786 nationally.
Compared with MA, the US and 2016
Coverage line is EAGLE-I's share of Massachusetts customers tracked each year.
Biggest outages in Middlesex County, 2017
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 29, 2017 18:30 | November 5, 2017 01:45 | 6d 7h | 66,566 | 2.2M |
| 2 | March 14, 2017 13:15 | March 17, 2017 03:00 | 2d 13h | 44,504 | 184K |
| 3 | July 21, 2017 10:00 | July 22, 2017 21:45 | 1d 11h | 12,045 | 22K |
| 4 | March 2, 2017 08:45 | March 4, 2017 08:00 | 1d 23h | 10,056 | 62K |
| 5 | June 11, 2017 16:45 | June 29, 2017 08:45 | 17d 16h | 7,208 | 79K |
| 6 | May 18, 2017 12:15 | May 21, 2017 01:15 | 2d 13h | 7,049 | 34K |
| 7 | February 12, 2017 16:30 | February 15, 2017 10:15 | 2d 17h | 6,961 | 66K |
| 8 | December 23, 2017 03:45 | December 27, 2017 10:45 | 4d 7h | 6,952 | 63K |
| 9 | August 17, 2017 10:15 | August 21, 2017 11:15 | 4d 1h | 6,751 | 28K |
| 10 | October 24, 2017 05:00 | October 28, 2017 20:15 | 4d 15h | 5,297 | 38K |
Outage episodes by size in 2017: 277 reached 100+ customers, 85 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 2017, 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 | 2017 | 3.4 hrs | 1.04 | 74 min | 0.07 |
| Unitil Energy Systems | 2017 | 14.4 hrs | 2.74 | 1.9 hrs | 1.33 |
| Fitchburg Gas & Elec Light Co | 2017 | 5.2 hrs | 2.46 | 75 min | 1.34 |
| Town of Reading - (MA) | 2017 | 21 min | 0.28 | 14 min | - |
| Town of Belmont - (MA) | 2017 | 4.0 hrs | 0.85 | 4.0 hrs | 0.85 |
| 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 2017; 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, 2017, 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/2017/massachusetts/middlesex-county