Southern Maryland Elec Coop Inc
Cooperative electric utility · Maryland · #164 of 3,199 U.S. utilities by customers · EIA utility #17637
Southern Maryland Elec Coop Inc is a cooperative electric utility serving 179,005 customers in Maryland. In 2025 it sold 3,511 gigawatt-hours of electricity for $549.10M in revenue, an average realized rate of 15.64¢ per kWh across all customer classes and 16.43¢ per kWh for residential customers. Its reported service territory covers 4 counties. EIA records its activities as: transmission, distribution.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 162,860 | 2,288 | $375.89M | 16.43¢ | |
| Commercial | 16,145 | 1,223 | $173.20M | 14.17¢ | |
| Total | 179,005 | 3,511 | $549.10M | 15.64¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (1,171 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 166,272 | 3,386 | $392.58M | 12.10¢ |
| 2022 | 168,895 | 3,421 | $495.59M | 15.26¢ |
| 2023 | 171,460 | 3,206 | $424.28M | 14.13¢ |
| 2024 | 174,303 | 3,383 | $475.15M | 14.84¢ |
| 2025 | 179,005 | 3,511 | $549.10M | 16.43¢ |
Reliability (2025)
Average outage time (SAIDI): 173 minutes per customer per year
Average outages (SAIFI): 1.56 per customer
Average restoration time (CAIDI): 111 minutes
As reported for Maryland under the IEEE standard, with major event days included where the standard reports them. Lower is better; see the reliability rankings.
Energy supply (2025)
Net generation: — GWh
Wholesale power purchased: 1,197 GWh
Winter peak demand: 1,036 MW
Energy losses: 3.2% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 99.8% of 180,813 meters
Customer-sited generation (net metering): 9,597 installations, 94.4 MW of capacity
This utility also reported 932 delivery-only customers (39.9 GWh delivered) in 2025. Delivery figures are excluded from the totals above because the same electricity is also reported by the energy supplier - see Methodology.
Counties served
Calvert, MDCharles, MDPrince Georges, MDSt Marys, MD
Other large utilities in Maryland
- Baltimore Gas & Electric Co - 1,221,264 customers, residential 20.19¢
- Potomac Electric Power Co - 872,449 customers, residential 21.47¢
- The Potomac Edison Company - 435,988 customers, residential 14.55¢
- Choptank Electric Cooperative, Inc - 57,450 customers, residential 17.11¢
- Hagerstown Light Department - 17,780 customers, residential 11.23¢
- Easton Utilities Comm - 11,316 customers, residential 15.18¢
- SFE Energy Maryland, Inc. - 4,330 customers, residential 13.35¢
- XOOM Energy Maryland, LLC - 3,462 customers, residential 11.44¢
All Maryland utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #17637 in the EIA frame.