County annual report · FIPS 24031
2018 Montgomery County, MD Power Outage Report
In 2018, customers in Montgomery County, MD went without power for an average of 6.2 hours, a total of 2.4M customer-hours (Maryland average 5.5 hours). That ranks 9th worst of 23 Maryland counties and 890th of 2,798 nationally.
Compared with MD, the US and 2017
Coverage line is EAGLE-I's share of Maryland customers tracked each year.
Biggest outages in Montgomery County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 2, 2018 02:30 | March 6, 2018 01:00 | 3d 22h | 108,677 | 1.9M |
| 2 | March 6, 2018 03:15 | March 10, 2018 07:45 | 4d 4h | 5,908 | 34K |
| 3 | January 1, 2018 08:45 | January 2, 2018 08:00 | 23h 15m | 5,350 | 13K |
| 4 | February 4, 2018 20:00 | February 6, 2018 06:30 | 1d 10h | 4,915 | 13K |
| 5 | April 4, 2018 11:15 | April 6, 2018 00:30 | 1d 13h | 4,647 | 8,164 |
| 6 | July 5, 2018 11:15 | July 8, 2018 08:45 | 2d 21h | 4,646 | 8,123 |
| 7 | October 1, 2018 06:45 | October 3, 2018 01:15 | 1d 18h | 4,184 | 6,696 |
| 8 | June 3, 2018 11:00 | June 7, 2018 07:30 | 3d 20h | 3,472 | 14K |
| 9 | April 7, 2018 11:45 | April 7, 2018 15:30 | 3h 45m | 3,413 | 865 |
| 10 | July 2, 2018 11:45 | July 4, 2018 13:45 | 2d 2h | 3,255 | 6,263 |
Outage episodes by size in 2018: 211 reached 100+ customers, 76 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 2018, 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 | 2018 | 5.1 hrs | 1.34 | 2.5 hrs | 1.08 |
| Baltimore Gas & Electric Co | 2018 | 7.2 hrs | 1.32 | 1.6 hrs | 0.95 |
| Potomac Electric Power Co | 2018 | 2.5 hrs | 0.83 | 57 min | 0.67 |
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 2018; 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, 2018, 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/2018/maryland/montgomery-county