Alva Review-Courier -

PHOENIX (AP) — The Hopi Tribe and coal mining groups on Tuesday sued the operator of an Arizona aqueduct system to try and keep a coal-fired power plant running beyond 2019.

The lawsuit filed in U.S. District Court by the tribe, the United Mine Workers of America and Peabody Energy contends the Central Arizona Water Conservation District is obligated under federal law to buy power from Navajo Generating Station near Page. The 2,250-megawatt plant is set to close next year and the prospects of new ownership depend on finding someone to purchase the electricity.

The conservation district, under...