Mid-Continent Area Power Pool. MAPP is a Minnesota-based, voluntary association of electric utilities whose members consist of investor-owned utilities, independent power producers, generation and transmission cooperatives, municipal electric utilities, public power districts, power marketers, a federal power marketing agency, and two Canadian Crown Corporations serving over 16 million people in seven Midwestern states and portions of Canada. MAPP serves its members and the public interest by operating a power pool to promote the efficiency and reliability of the bulk power system and a regional transmission tariff to provide open access to the bulk transmission system.