How reliable is the power in Maryland?
Maryland ranks 11th of 45 states without major events and 9th with them (1st = fewest minutes), 54 below the U.S. 129 and 543 below the U.S. 662. Major events added 43 minutes, 36% of the with-events total. The figure covers 2,685,372 customers, 97% of the 2,773,701 EIA lists for Maryland.
Maryland with and without major events
minutes without power per customer, 2024, Maryland and U.S.
- 75Maryland, no major events
- 129U.S., no major events
- 118Maryland, with major events
- 662U.S., with major events
| Measure | Maryland without | Maryland with | U.S. without | U.S. with |
|---|---|---|---|---|
| SAIDI, minutes per customer | 75 | 118 | 129 | 662 |
| SAIFI, interruptions per customer | 0.69 | 0.82 | 1.06 | 1.53 |
| CAIDI, minutes per interruption | 109 | 145 | 122 | 433 |
| Median utility, SAIDI minutes | 67 | 134 | — | — |
Which Maryland utilities move the number
Baltimore Gas & Electric Co serves 50% of the customers in the Maryland figure: 56% of lost customer-minutes with major events, 44% without. Without Baltimore Gas & Electric Co, the weighted figure would be 103 minutes with major events and 84 without, against 118 and 75.
- Baltimore Gas & Electric Co: 1,341,009 customers (50%), 67 min without and 133 with; 56% of lost minutes with major events, 44% without.
- The Potomac Edison Company: 284,807 customers (11%), 159 min without and 168 with; 15% of lost minutes with major events, 22% without.
- Potomac Electric Power Co: 600,103 customers (22%), 46 min without and 65 with; 12% of lost minutes with major events, 14% without.
All Maryland utilities in the 2024 file
21 utilities in the 2024 EIA-861 files for Maryland: 7 follow IEEE 1366, 1 uses another method, 13 filed no reliability figures. 8 are listed.
| Easton Utilities Comm | Municipal | IEEE 1366 | 10,990 | 10 | 10 | 0.23 | 0.23 | 0 | 1 of 7 | — |
|---|---|---|---|---|---|---|---|---|---|---|
| Potomac Electric Power Co | Investor Owned | IEEE 1366 | 600,103 | 46 | 65 | 0.51 | 0.59 | 29 | 2 of 7 | — |
| Delmarva Power | Investor Owned | IEEE 1366 | 214,087 | 56 | 79 | 0.57 | 0.68 | 29 | 3 of 7 | — |
| Baltimore Gas & Electric Co | Investor Owned | IEEE 1366 | 1,341,009 | 67 | 133 | 0.63 | 0.80 | 50 | 4 of 7 | — |
| Southern Maryland Elec Coop Inc | Cooperative | IEEE 1366 | 177,329 | 114 | 146 | 1.13 | 1.31 | 22 | 5 of 7 | — |
| Choptank Electric Cooperative, Inc | Cooperative | IEEE 1366 | 57,047 | 120 | 144 | 1.17 | 1.30 | 16 | 6 of 7 | — |
| The Potomac Edison Company | Investor Owned | IEEE 1366 | 284,807 | 159 | 168 | 1.07 | 1.11 | 5 | 7 of 7 | — |
| A & N Electric Coop | Cooperative | Other method | 317 | 29 | 29 | 0.23 | 0.23 | — | Not ranked | other method, not comparable; under 10,000 customers |
Maryland utilities with no reliability figures
13 in the sales file, no SAIDI or SAIFI row.
| Utility | Type | Customers |
|---|---|---|
| Tesla Inc. | Behind the Meter | 27,136 |
| Sunrun Inc. | Behind the Meter | 25,231 |
| Hagerstown Light Department | Municipal | 17,743 |
| TerraForm US Energy Services, LLC | Behind the Meter | 7 |
| Greenbacker Renewable Energy Corporation | Behind the Meter | 1 |
| MidAmerican Energy Services, LLC | Not stated | — |
| Town of Berlin - (MD) | Municipal | — |
| BP Energy Retail LLC | Not stated | — |
| Constellation NewEnergy, Inc | Not stated | — |
| Thurmont Municipal Light Co | Municipal | — |
| Texas Retail Energy, LLC | Not stated | — |
| Freepoint Energy Solutions LLC | Not stated | — |
| Town of Williamsport - (MD) | Municipal | — |
The biggest Maryland utilities against the U.S.
- Baltimore Gas & Electric Co (investor owned, 49% of Maryland customers in the file): SAIDI without major events 67 min, 63 below the U.S. 129; with major events 133 min against 662.
- Potomac Electric Power Co (investor owned, 22% of Maryland customers in the file): SAIDI without major events 46 min, 83 below the U.S. 129; with major events 65 min against 662.
- The Potomac Edison Company (investor owned, 11% of Maryland customers in the file): SAIDI without major events 159 min, 30 above the U.S. 129; with major events 168 min against 662.
- Delmarva Power (investor owned, 8% of Maryland customers in the file): SAIDI without major events 56 min, 73 below the U.S. 129; with major events 79 min against 662.
- Southern Maryland Elec Coop Inc (cooperative, 6% of Maryland customers in the file): SAIDI without major events 114 min, 15 below the U.S. 129; with major events 146 min against 662.
Maryland by type of utility
Among Maryland utilities that report under IEEE 1366, municipal utilities average 10 minutes without major events and cooperative utilities 115.
| Type | Utilities | Customers | SAIDI without | Median utility | SAIDI with |
|---|---|---|---|---|---|
| Investor Owned | 4 | 2,440,006 | 72 | 61 | 116 |
| Cooperative | 2 | 234,376 | 115 | 117 | 145 |
| Municipal | 1 | 10,990 | 10 | 10 | 10 |
Next to Maryland in the ranking
Maryland report card
Smart meters: 88% of residential meters, 7 utilities (U.S. 92%). Maryland time-based rates: 5 of 7 utilities, 69.7% of residential customers enrolled (U.S. 10.6%). Maryland efficiency spend: $119.1 per customer (U.S. $124.2). Demand response: 107 W per customer (U.S. 77). Maryland net-metered systems: 44.1 per 1,000 customers. Rankings.
Is your Maryland utility better or worse than the Maryland median?
- Loading.
More
- Maryland against all states
- Maryland utilities among the best and worst
- Maryland utility reliability and price by company
- Maryland major outage reports from the Department of Energy
- Maryland electricity prices
- Maryland help with your bill
8 Maryland filings in EIA-861 2024 (retrieved 2026-10-01), 7 ranked utilities. Method and sources.
Questions
How many minutes without power did the average Maryland customer have in 2024?
75 minutes without major events and 118 with them (7 IEEE 1366 utilities, customer-weighted).
Why do the two Maryland numbers differ so much?
Major events add 43 of the 118 minutes (36%); Baltimore Gas & Electric Co supplies 56% of the with-events total.
Which Maryland utility reported the fewest and the most minutes?
Among 7 utilities with 10,000+ customers: Easton Utilities Comm 10 minutes without major events, and The Potomac Edison Company 159.
Which Maryland utilities use which method?
7 follow IEEE 1366, 1 uses another method, 13 filed no reliability figures.