Marshall Municipal Utilities (MMU) has been providing electric and water utility services to the City of Marshall, Minnesota for over 113 years. Marshall has a population of 13,000 people. MMU is the 2nd largest municipal utility in the state in terms of retail energy sales at over 604,000 MWhs sold in 2006. MMU serves over 6,400 customers and has a peak demand of more than 89 megawatts. MMU's water treatment plant, built in 1999, processed 1.1 billion gallons of water in 2006 provided by 13 wells located in and around Marshall.