The Trump administration ordered an aging coal-fired power plant in Colorado to stay open on Tuesday, a day before it was set to be retired.

The order from Energy Secretary Chris Wright will keep the nearly 50-year-old Craig Generating Station Unit 1 in northwest Colorado operating until the end of March, with an option to extend it further.

It’s the Department of Energy’s sixth such move this year; Wright has also ordered two coal plants in Indiana, one in Michigan and one in Washington state to stay open past their retirement dates, as well as a Pennsylvania power plant that runs on oil.

“Keeping this coal plant online will ensure Americans maintain an affordable, reliable, and secure supply of electricity,” Wright said in a statement.