Indiana Power And Light Company says its dependence on coal will fall to 44 percent by 2017 as it switches to natural gas.
The Hoosier Environmental Council and other organizations say the byproduct of coal burning is a serious threat to the public's health.
More than 15,000 Hoosiers are without power after heavy snowfall and subzero temperatures hit the state.
The Environmental Protection Agency says the standards will help combat climate change, but Governor Mike Pence says the proposal could hurt Indiana's economy.
Once completed the natural gas plant would employ about two dozen people, approximately the same number as the coal plant.