Southern Maryland gets it power via the South Maryland Electric Cooperative (SMECO), which distributes electricity to more than 147,000 residential, commercial, and industrial customers in four counties. One of the ten largest electric cooperatives in the US, the member-owned enterprise gets its wholesale power supply through its membership in ACES Power Marketing. SMECO's service area includes all of Calvert and St. Mary's counties, and parts of of Calvert and Prince George's counties. Cities covered include Hughesville, Leonardtown, Prince Frederick, and White Plains.