Power outages in Maryland
In 2025, the average Maryland customer lost power for 3.1 hours (183.9 minutes) over the year. That is below the US median of 4.3 hours (258.7 minutes) across 50 states compared.
Trend
Yearly outage time has moved up and down since 2020, from 2.0 hours in 2020 to 3.1 hours in 2025. The worst year was 2022, at 4.3 hours per customer.
Utilities in 2025
Easton Utilities Comm had the lowest SAIDI in 2025 at 0.5 hours (30.5 minutes). The Potomac Edison Company had the highest at 6.7 hours (399.1 minutes).
| Utility | Customers | Hours / yr | Interruptions |
|---|---|---|---|
| The Potomac Edison Company | 288,257 | 6.7 | 1.3 |
| Choptank Electric Cooperative, Inc | 56,839 | 3.6 | 1.8 |
| Baltimore Gas & Electric Co | 1,345,150 | 2.9 | 0.9 |
| Southern Maryland Elec Coop Inc | 180,658 | 2.9 | 1.6 |
| Delmarva Power | 215,634 | 1.9 | 0.9 |
| Potomac Electric Power Co | 604,786 | 1.7 | 0.7 |
| Easton Utilities Comm | 11,311 | 0.5 | 0.6 |
What this means for backup power
For everyday outages, enter 3.2 hours in the calculator, which is the average length of one interruption. To ride out a year like 2022, size for 4.3 hours, which is all of that year's outage hours added together.
FAQ
How long do power outages last in Maryland?
One interruption lasts 3.2 hours on average. Over a full year, the average customer had 0.958 interruptions in 2025.
Is SAIDI the length of one outage?
No. SAIDI is the total outage time per customer in a year. In 2025 it was 3.1 hours in Maryland, while a single outage averages 3.2 hours.
How much backup power should I plan for?
For everyday outages, plan around 3.2 hours. If you want to cover a bad year like 2022, plan for 4.3 hours of total outage time. Use the calculator to turn either number into a battery or generator size.
Utility pages
Source: U.S. EIA Form 861 Reliability file. Data snapshot 2026-11-05.