An Associated Press investigation found there could be more premature deaths, greenhouse gas emissions and other impacts.
U.S. District Judge Brian Morris is presiding over a Thursday hearing on whether the moratorium should be reinstated.
The rural electricity provider in Colorado coal country is parting ways because Tri State is too closely tied to fossil fuels.
The utility’s new goal is good news for Gov.-elect Jared Polis, who pledged a 100 percent renewable energy goal as part of his campaign.
Westmoreland Coal Co. has more than $1.4 billion in debt amid declining demand for the fuel.
The company said customers will save about $213 million by 2054 as renewable energy continues to get cheaper.
Xcel plans to buy two existing gas-fired generating plants in Colorado and add five solar farms and three wind farms.
When the big regional banker said it would stop financing fossil fuel operations, Craig residents started circling the wagons.
The state began its shift away from coal nearly a decade ago with the Clean Air, Clean Jobs act.
Pueblo is “poised to become the renewable energy hub for Colorado and likely the region.”