States › Maryland › Southern Maryland Elec Coop Inc
electric cooperative · EIA utility 17637
Southern Maryland Elec Coop Inc
Average price is revenue divided by sales for the sector and year; it is not a tariff rate. Reliability figures are as reported by utilities to EIA on Form 861 and may use different calculation methods. Annual figures: Form EIA-861 for 2024, final release. Monthly state figures run to July 2026.
Southern Maryland Elec Coop Inc serves 160,882 residential customers in Maryland as an electric cooperative, according to its 2024 Form EIA-861 filing, with a service territory that touches 4 counties.
Its average residential price that year was 14.84¢ per kilowatthour, 17% below the Maryland average of 17.86¢ and 10.0% below the US average of 16.48¢. The figure is residential revenue divided by residential sales, so it folds in fixed charges, riders and every rate schedule the utility bills under.
That works out to an average residential bill of $170.08 a month on average use of 1,146 kWh a month. Across Maryland the average bill was $165.87 on 929 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.
The price covers the 158,375 residential customers on bundled service. A further 2,507 take delivery only and buy their energy from another supplier; EIA collects just part of their bill from this respondent, so they are left out of the average.
For reliability it reported a SAIDI of 146.0 minutes per customer with major event days included and 113.9 minutes with them excluded, calculated under IEEE 1366 standard. The median among Maryland utilities reporting was 106.3 minutes with major event days; this utility's figure is 37% above that median.
The average price is up 19.3% on 2019, against up 36.1% for Maryland as a whole, and up 5.0% on 2023. EIA's early release for 2025, which has not been fully edited, shows 16.43¢.
Compared with Maryland, the US and other electric cooperatives
| Measure, 2024 | This utility | Electric cooperatives, US median | Maryland | United States |
|---|---|---|---|---|
| Average residential price per kWh | 14.84¢ | 13.74¢ | 17.86¢ | 16.48¢ |
| Average monthly residential bill | $170.08 | $149.95 | $165.87 | $142.26 |
| Average monthly use, kWh | 1,146 | 1,126 | 929 | 863 |
| Residential price change, 1 year | +5.0% | — | +7.6% | +3.0% |
| Residential price change, 5 years | +19.3% | — | +36.1% | +26.7% |
| SAIDI, all events (minutes) | 146.0 | 263.0 | 106.3 median | 184.5 median |
| SAIDI, without major event days | 113.9 | 147.0 | 61.4 median | 99.8 median |
State and US prices, bills and use are EIA's own averages over every customer. The ownership column and the reliability columns are medians across utilities with at least 1,000 residential customers, computed on this site from the final 2024 file. Among the 3 filings by electric cooperatives in Maryland, the median price was 14.84¢. In Maryland this utility's price ranks 5 of 9, counting from the highest.
Average price by year
Southern Maryland Elec Coop IncMaryland averageUS average
Year by year
| Year | ¢ per kWh | Maryland ¢ | Monthly bill | kWh a month | Residential customers | All sales |
|---|---|---|---|---|---|---|
| 2025 early release | 16.43¢ | 19.48¢ | $192.34 | 1,171 | 163,451 | 3.6 TWh |
| 2024 | 14.84¢ | 17.86¢ | $170.08 | 1,146 | 160,882 | 3.4 TWh |
| 2023 | 14.13¢ | 16.60¢ | $154.24 | 1,091 | 158,837 | 3.3 TWh |
| 2022 | 15.26¢ | 14.46¢ | $181.70 | 1,191 | 157,143 | 3.5 TWh |
| 2021 | 12.10¢ | 13.12¢ | $145.04 | 1,198 | 155,541 | 3.5 TWh |
| 2020 | 11.43¢ | 13.01¢ | $132.95 | 1,163 | 153,531 | 3.3 TWh |
| 2019 | 12.44¢ | 13.12¢ | $149.36 | 1,200 | 151,719 | 3.5 TWh |
| 2018 | 12.32¢ | 13.30¢ | $156.02 | 1,266 | 150,167 | 3.6 TWh |
| 2017 | 12.90¢ | 13.96¢ | $148.31 | 1,150 | 149,170 | 3.4 TWh |
| 2016 | 13.07¢ | 14.23¢ | $157.28 | 1,203 | 146,605 | 3.4 TWh |
| 2015 | 12.34¢ | 13.82¢ | $152.96 | 1,239 | 146,123 | 3.5 TWh |
| 2014 | 14.21¢ | 13.63¢ | $178.61 | 1,257 | 142,886 | 3.5 TWh |
| 2013 | 13.89¢ | 13.25¢ | $175.55 | 1,264 | 140,732 | 3.4 TWh |
Bundled residential service only in the price, bill and use columns. Bill = residential revenue ÷ customers ÷ 12; use = residential sales ÷ customers ÷ 12. EIA describes its early release as not fully edited; it is shown for this utility alone and enters no average, median or rank on this site.
Month by month
Southern Maryland Elec Coop IncMaryland average
Sales by sector, 2024
| Sector | Customers | Sales | Share of sales | Revenue | ¢ per kWh, bundled |
|---|---|---|---|---|---|
| Residential | 160,882 | 2.2 TWh | 64% | $324,671,700 | 14.84¢ |
| Commercial | 16,273 | 1.2 TWh | 36% | $153,021,200 | 12.60¢ |
Customers, sales and revenue count every service type the utility reported (bundled, energy-only and delivery-only). The price column uses bundled service alone, because part-bill revenue would understate it. Sources of energy: 3.5 TWh in total, of which 0% was its own net generation and 1.1 TWh was bought wholesale; summer peak demand 854 MW.
Reliability
Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 1.31 interruptions per customer with major event days, 1.13 without; CAIDI 111.4 minutes per interruption. EIA's Maryland total across all reporting utilities was 118.1 minutes with major event days and 75.1 without. Major event days are storms and similar events that a utility's chosen method sets apart; methods differ, so treat comparisons as approximate. What SAIDI and SAIFI mean.
| Year | SAIDI, all events | SAIDI, no major events | SAIFI, all events | SAIFI, no major events | Method |
|---|---|---|---|---|---|
| 2025 early release | 173.1 | 117.7 | 1.56 | 1.26 | IEEE 1366 |
| 2024 | 146.0 | 113.9 | 1.31 | 1.13 | IEEE 1366 |
| 2023 | 201.1 | 102.8 | 1.33 | 1.09 | IEEE 1366 |
| 2022 | 492.8 | 117.0 | 1.96 | 1.32 | IEEE 1366 |
| 2021 | 162.2 | 120.0 | 1.56 | 1.30 | IEEE 1366 |
| 2020 | 222.9 | 148.8 | 1.55 | 1.31 | Other |
| 2019 | 113.6 | 113.6 | 1.09 | 1.09 | Other |
| 2018 | 453.3 | 115.4 | 2.02 | 1.34 | Other |
| 2017 | 317.4 | 145.8 | 2.02 | 1.55 | Other |
| 2016 | 121.8 | 116.4 | 1.05 | 1.00 | Other |
| 2015 | 233.4 | 233.4 | 2.08 | 2.08 | Other |
| 2014 | 100.8 | 83.4 | 1.03 | 0.97 | Other |
| 2013 | 81.6 | 81.6 | 0.93 | 0.93 | Other |
Counties in its service territory
Counties the utility listed on Form EIA-861 for 2024. Listing a county does not mean the utility serves all of it.
Other utilities in Maryland
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| Choptank Electric Cooperative, Inc | Cooperative | 50,697 | 16.46¢ | $183.10 | 143.8 | 120.2 |
| The Potomac Edison Company | Investor-owned | 391,834 | 13.35¢ | $151.12 | 204.9 | 192.0 |
| Potomac Electric Power Co | Investor-owned | 872,387 | 19.04¢ | $141.26 | 53.5 | 39.1 |
| Baltimore Gas & Electric Co | Investor-owned | 1,214,100 | 17.91¢ | $155.58 | 133.5 | 66.7 |
| Hagerstown Light Department | Municipal | 15,099 | 7.77¢ | $70.93 | — | — |
| Easton Utilities Comm | Municipal | 8,590 | 13.06¢ | $135.94 | 10.5 | 10.5 |
| WGL Energy Services, Inc. energy only | Retail power marketer | 43,663 | — | — | — | — |
| XOOM Energy Maryland, LLC energy only | Retail power marketer | 7,165 | — | — | — | — |
All Maryland utilities · Electric cooperatives nationwide
Questions and answers
How much does electricity cost from Southern Maryland Elec Coop Inc?
Residential customers paid an average of 14.84¢ per kilowatthour in 2024. EIA derives this by dividing residential revenue by residential sales; it is an average across all rate schedules and charges, not a tariff rate.
How does that compare with Maryland?
The Maryland average residential price in 2024 was 17.86¢ and the US average 16.48¢; Southern Maryland Elec Coop Inc was 17% below the state figure. Among 9 utility filings with a bundled residential price in Maryland, it had the 5th highest.
What is the average Southern Maryland Elec Coop Inc bill?
$170.08 a month in 2024, on average residential use of 1,146 kWh a month (annual revenue and sales divided by customers and by twelve). The Maryland average was $165.87 on 929 kWh.
How reliable is Southern Maryland Elec Coop Inc service?
It reported 146.0 minutes of interruption per customer (SAIDI) including major event days and 113.9 minutes excluding them, with 1.31 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.
Is the Southern Maryland Elec Coop Inc price rising?
The average residential price was up 5.0% in 2024 compared with 2023 and up 19.3% compared with 2019. EIA's early, not fully edited release for 2025 shows 16.43¢.
Which counties does Southern Maryland Elec Coop Inc serve?
Its Form EIA-861 service territory lists 4 counties: Calvert County, MD, Charles County, MD, Prince George's County, MD and St. Mary's County, MD. A county can appear in several utilities' territories.
Provenance
Source: U.S. Energy Information Administration. Annual figures are from Form EIA-861 (sales to ultimate customers, reliability, operational data and service territory files), final release for 2024, respondent "Southern Maryland Elec Coop Inc", utility number 17637; the 2025 row is from EIA's early release. Monthly utility figures are from the Form EIA-861M sample. State and US averages are from the Form EIA-861M sales and revenue workbook, published through July 2026. All are US government works in the public domain. Page built 1 Oct 2026. Errors in processing are corrected at the next build; see corrections. For tariffs and rate schedules, consult the utility or the state utility commission.