Basin Electric Power Cooperative is a wholesale electric generation and transmission cooperative based in North Dakota that provides electricity to 3 million customers in nine U.S. states.

Big Horn Rural Electric Company serves five counties in Wyoming (Big Horn, Washakie, Park, Sheridan, and Johnson) and two counties in Montana (Big Horn and Carbon).

Black Hills Energy serves natural gas and electric utilities to 1.3 million customers in eight states: Arkansas, Colorado, Iowa, Kansas, Montana, Nebraska, South Dakota and Wyoming.

High Plains Power operates in Fremont, Hot Springs, Washakie, Natrona, Carbon, Big Horn, Johnson and Park counties.

High West Energy provides electrcity to adjacent areas in SE Wyoming, SW Nebraska, and NW Colorado.

Niobrara Electric Association provides electricity to rural Niobrara County WY and the northwest portion of rural Sioux County NE.

NorthWestern Energy is the electricity and natural gas provider for Yellowstone National Park.

Powder River Energy Corporation is a rural electricity cooperative serving Campbell, Crook, Johnson, Sheridan and Weston counties in northeast Wyoming.

WYRULEC Electric Company serves rural areas of Goshen County WY and a small rural area of Scotts Bluff County NE.