County annual report · FIPS 24031
2015 Montgomery County, MD Power Outage Report
In 2015, customers in Montgomery County, MD went without power for an average of 1.8 hours, a total of 728K customer-hours (Maryland average 2.0 hours). That ranks 13th worst of 24 Maryland counties and 1312th of 2,484 nationally.
Compared with MD, the US
Coverage line is EAGLE-I's share of Maryland customers tracked each year.
Biggest outages in Montgomery County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 23, 2015 13:00 | June 26, 2015 01:15 | 2d 12h | 20,436 | 205K |
| 2 | December 12, 2015 13:15 | December 12, 2015 21:30 | 8h 15m | 10,616 | 3,043 |
| 3 | June 17, 2015 05:00 | June 22, 2015 08:15 | 5d 3h | 9,012 | 101K |
| 4 | April 17, 2015 16:00 | April 17, 2015 17:30 | 1h 30m | 5,686 | 5,690 |
| 5 | July 30, 2015 00:15 | August 1, 2015 02:30 | 2d 2h | 5,055 | 17K |
| 6 | April 20, 2015 05:45 | April 20, 2015 22:45 | 17h | 4,626 | 6,283 |
| 7 | June 1, 2015 10:15 | June 3, 2015 07:15 | 1d 21h | 4,236 | 8,993 |
| 8 | August 10, 2015 06:15 | August 12, 2015 01:00 | 1d 18h | 3,434 | 3,369 |
| 9 | July 21, 2015 02:15 | July 24, 2015 09:30 | 3d 7h | 3,314 | 19K |
| 10 | September 26, 2015 14:00 | September 27, 2015 09:00 | 19h | 2,947 | 5,476 |
Outage episodes by size in 2015: 190 reached 100+ customers, 79 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 Montgomery County reported on EIA Form 861 for 2015, 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 |
|---|---|---|---|---|---|
| The Potomac Edison Company | 2015 | 2.2 hrs | 0.96 | 2.1 hrs | 0.95 |
| Baltimore Gas & Electric Co | 2015 | 1.7 hrs | 0.93 | 1.5 hrs | 0.89 |
| Potomac Electric Power Co | 2015 | 1.9 hrs | 0.89 | 1.9 hrs | 0.89 |
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 Maryland's customers in 2015; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 395,748 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. Montgomery County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Montgomery County, MD annual power outage report, 2015, 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/2015/maryland/montgomery-county