County annual report · FIPS 24031
2020 Montgomery County, MD Power Outage Report
In 2020, customers in Montgomery County, MD went without power for an average of 1.3 hours, a total of 515K customer-hours (Maryland average 2.2 hours). That ranks 23rd worst of 24 Maryland counties and 2543rd of 3,019 nationally.
Compared with MD, the US and 2019
Coverage line is EAGLE-I's share of Maryland customers tracked each year.
Biggest outages in Montgomery County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 9, 2020 23:45 | September 12, 2020 23:00 | 2d 23h | 10,872 | 9,540 |
| 2 | September 2, 2020 10:45 | September 5, 2020 09:30 | 2d 22h | 6,081 | 21K |
| 3 | June 25, 2020 10:45 | June 27, 2020 07:45 | 1d 21h | 6,034 | 25K |
| 4 | November 1, 2020 18:45 | November 4, 2020 02:15 | 2d 7h | 4,811 | 33K |
| 5 | July 21, 2020 19:30 | July 24, 2020 07:00 | 2d 11h | 4,684 | 24K |
| 6 | June 10, 2020 10:00 | June 12, 2020 10:00 | 2d | 4,239 | 23K |
| 7 | April 13, 2020 03:00 | April 14, 2020 08:45 | 1d 5h | 4,146 | 12K |
| 8 | August 9, 2020 11:45 | August 10, 2020 00:30 | 12h 45m | 4,024 | 5,160 |
| 9 | June 19, 2020 10:00 | June 20, 2020 07:45 | 21h 45m | 3,838 | 7,049 |
| 10 | June 15, 2020 10:00 | June 16, 2020 01:00 | 15h | 3,725 | 5,128 |
Outage episodes by size in 2020: 215 reached 100+ customers, 63 reached 1,000+ customers, 1 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 2020, 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 | 2020 | 2.4 hrs | 1.00 | 2.3 hrs | 0.99 |
| Baltimore Gas & Electric Co | 2020 | 2.0 hrs | 0.96 | 78 min | 0.78 |
| Potomac Electric Power Co | 2020 | 53 min | 0.54 | 46 min | 0.50 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 98% of Maryland's customers in 2020; 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, 2020, 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/2020/maryland/montgomery-county