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The Wyoming Department of Environmental Quality has certified the Seminoe Pumped Storage Project, proposed by rPlus Hydro. The facility will feature a 13,000-acre-foot lake above Seminoe Reservoir, capable of generating 900 megawatts of electricity for up to 12 hours.

The project has raised wildlife concerns, particularly regarding the Miracle Mile fishing area and bighorn sheep herds. The certification fulfills obligations under the Clean Water Act to protect the North Platte River.

Further permits are required from the U.S. Army Corps of Engineers and others, with final approval from the Federal Energy Regulatory Commission expected later this year.