Western Minnesota Municipal Power Agency (WMMPA) was incorporated on June 16, 1976, as a municipal corporation and political subdivision of the State of Minnesota. WMMPA has a formal relationship through which WMMPA finances the construction and acquisition of the generation and transmission facilities for members of Missouri River Energy Services (MRES). MRES staff provides the administrative services to manage WMMPA's portfolios. WMMPA's membership primarily includes the Minnesota members of MRES.

FitchRatings, a New York-based financial rating agency assigned WMMPA’s outstanding power supply revenue bonds an AA- with stable outlook. Moody’s Investors Service, also from New York, upgraded the ratings of WMMPA’s outstanding bonds from A1 to Aa3 with a stable outlook.

Some of WMMPA's projects include a 16.47 perent share of the Laramie River Station in Wyoming; financing of the 140 megawatt (MW) natural gas-fired Exira Station in west central Iowa and the 65 MW oil-fired generating facility in Watertown; and the financing of a wind project located near the Minnesota community of Worthington. WMMPA also owns some transmission facilities in Minnesota, and expects to invest in future transmission upgrades and expansions in Minnesota and the surrounding region as part of the CapX2020 effort.