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MAPP is a voluntary association of electric utilities who do business in the Upper Midwest. Its members are investor-owned utilities, cooperatives, municipals, public power districts, a power marketing agency, power marketers, Regulatory Agencies, and independent power producers.

The MAPP organization performs three functions: it is a Reliability Council, responsible for the safety and reliability of the bulk electric system, under the North American Electric Reliability Council (NERC); a regional transmission group, responsible for facilitating open access of the transmission system; and a power and energy market, where MAPP Members and non-members may buy and sell electricity.

MAPP was formed in the mid-1960s to perform regional planning of transmission and generation. In 1972, the MAPP Agreement, outlining the provisions of the power pool, was approved by the Federal Power Administration. Members operated under this Agreement until November 1, 1996 when the Restated Agreement went into effect.

MAPPCOR, located in St. Paul, Minnesota, provides services and maintains the personnel and facilities of the MAPP Center. Its staff includes engineers, technicians, computer programmers and other professionals. MAPPCOR serves as an Impartial Administrator for the region, approving or denying transmission requests for transactions. It also operates the MAPP OASIS node.