Southern Maryland Electric Co-op electricity rates
Electric cooperative · Maryland · RFC region · PJM
Southern Maryland Electric Co-op is a member-owned electric cooperative, so its customers own it and elect its board, serving 162,860 homes in Maryland. Its residential customers pay an average of 18.48¢/kWh including fixed and delivery charges, 3% more than the U.S. average.
Rate basis: EIA-861M monthly utility data, 12 months ending 2026-07.
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Southern Maryland Electric Co-op bill estimates
| Monthly use | At average all-in rate |
|---|---|
| 500 kWh | $92.40 |
| 1,000 kWh | $184.80 |
| 1,500 kWh | $277.20 |
| 2,000 kWh | $369.60 |
Southern Maryland Electric Co-op residential rate plans
| Plan | Effective | Customer charge | Energy charges |
|---|---|---|---|
| Residential Service Time of Usetime-of-use | 2025-07-01 | $10.07 | 14.5¢ (12am–2pm, 7pm–12am) · 27.5¢ (2pm–7pm) — summer weekdays |
| Residential Servicetime-of-use | 2025-07-01 | $10.07 | 6.5¢ (12am–12am) — summer weekdays |
| Residential Servicetime-of-use | 2025-07-01 | $10.07 | 17.3¢ (12am–12am) — summer weekdays |
Source: OpenEI U.S. Utility Rate Database. Rates change. Check the linked tariff or your bill for current figures.
Southern Maryland Electric Co-op rate history
2015–2025: +33% change in the average residential rate (12.35¢ → 16.43¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | Southern Maryland Electric Co-op | Maryland avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 173 | 178 | 266 |
| Outages per customer (SAIFI) | 1.56 | 0.96 | 1.34 |
| Average restoration time (CAIDI) | 111 min | — | — |
| Outage minutes excluding major storms | 118 | 79 | 121 |
Outages in counties served (2025)
From ORNL EAGLE-I, which tracks customers without power every 15 minutes. These counts cover every utility in each county. Weighted across Southern Maryland Electric Co-op's counties, customers averaged 3 hr 16 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Calvert | 315 | 57 | 8,498 | 2025-05-17 |
| St Marys | 236 | 52 | 11,745 | 2025-05-16 |
| Prince Georges | 186 | 24 | 29,631 | 2025-06-19 |
| Charles | 148 | 61 | 8,116 | 2025-07-07 |
Southern Maryland Electric Co-op service area
Southern Maryland Electric Co-op serves 4 counties in Maryland and 73 ZIP codes.
Calvert, Charles, Prince Georges, St Marys
Cities: Waldorf, Saint Charles, Clinton, St. Charles, Camp Springs, Greater Upper Marlboro, Kettering, Bennsville, California, Lexington Park, Chesapeake Ranch Estates-Drum Point, Rosaryville, Accokeek, Chesapeake Ranch Estates, Brock Hall, Marlboro Village, La Plata, Marlton, Westphalia, Bryans Road, Brandywine, Chesapeake Beach, Indian Head, Golden Beach, Marlboro Meadows, Leonardtown, Huntingtown Town Center, Mellwood, Drum Point, Huntingtown, Prince Frederick, Dunkirk Town Center, Dunkirk, Solomons, Hughesville, Owings, Baden, Queenland, Lusby, Long Beach
Programs, smart meters & solar
| Smart meters (AMI) for homes | 100% |
| Customers with daily usage data online | 163,451 |
| Time-based rate programs | Time-of-use rates |
| Homes on time-based rates | 1,488 |
| Net-metered solar homes | 9,517 |
| Home batteries paired with solar | 368 |
| Homes in demand response (e.g. thermostat rebates) | 10,262 |
| Residential efficiency incentives paid (2025) | $8,939,591 |
| Residential energy saved by programs | 30,445 MWh |
Southern Maryland Electric Co-op at a glance
| Ownership | Electric cooperative |
| Services | Transmission, Distribution |
| Commercial rate | 15.29¢/kWh |
| Retail revenue (2025) | $549,097,600 |
| Electricity sold (2025) | 3,511,129 MWh |
| Peak demand | 840 MW summer · 1,036 MW winter |
| Line losses | 3.2% |
| Balancing authority | PJM |
| EIA utility ID | 17637 |
| Website | MD PSC |
Other utilities in Maryland
Frequently asked questions
What is Southern Maryland Electric Co-op's electricity rate?
Southern Maryland Electric Co-op residential customers pay an average of 18.48¢ per kWh, all charges included (EIA-861M monthly utility data, 12 months ending 2026-07). That's 12% below the Maryland average of 21.03¢ and 3% above the U.S. average.
What is the average Southern Maryland Electric Co-op electric bill?
About $216 a month. The average Southern Maryland Electric Co-op home uses 1,171 kWh a month. At 1,000 kWh the bill would be about $185.
How many customers does Southern Maryland Electric Co-op have?
Southern Maryland Electric Co-op serves 162,860 residential customers and 179,937 customers in total in Maryland, across 4 counties.
How reliable is Southern Maryland Electric Co-op?
In 2025, the average Southern Maryland Electric Co-op customer was without power for 2 hr 53 min (SAIDI) over 1.56 interruptions (SAIFI), including major storms. Excluding major event days it was 118 min. The Maryland average was 2 hr 58 min and the U.S. average 4 hr 26 min.
Does Southern Maryland Electric Co-op offer time-of-use rates?
Yes. The OpenEI rate database lists 3 time-of-use residential plans, including Residential Service Time of Use. Running big appliances off-peak can cut their cost. Pick the plan in the calculator above to see by how much.
Does Southern Maryland Electric Co-op offer net metering for solar?
Southern Maryland Electric Co-op had 9,517 residential net-metered customers in 2025 with 88.9 MW of capacity and 368 solar-paired batteries. Estimate solar savings at this utility's rate.
Sources: EIA-861 2025 and EIA-861M (through July 2026), OpenEI URDB, ORNL EAGLE-I, U.S. Census. Methodology. Spot an error? Rates change often, so confirm with Southern Maryland Electric Co-op before making decisions.