Tri-State, Xcel and Platte River Power had the closures slated for 2030. But Colorado air quality regulators say it must be done earlier to meet greenhouse gas targets.

Xcel is the only utility in Colorado with large, coal-fired power plants set to operate past 2030.

Wind energy industry leaders don't like the optics — even if the old blades don't pose environmental harm — and Colorado could see a new generation of recyclable, repairable blades

Xcel Energy wanted a $158.3 million increase, but the PUC pushed back to keep rate hike passed on to residential customers to about $1.03 per month.

A proposal before Colorado’s Public Utilities Commission would increase the average bill of a residential customer in the state by 6.5%

The success of the city’s redevelopment plans -- including a U.S. Olympic museum and a downtown sports stadium -- depend on powering down the massive coal-fired electric plant, Colorado Springs' leaders say

“My dream is to get to the world where hydropower is like rooftop solar," said Kurt Johnson, a hydropower advocate who co-authored the Colorado Energy Office’s “2015 Small Hydropower Handbook.”

Gas isn’t cheap, neither is learning how to fly. Going electric could cut aviation fuel costs by 90 percent, save students money and, as an added bonus, cut emissions

Costs, regulations pushing legitimate marijuana grow operations to be more efficient, but illicit grows still consume 75 percent of the energy used to cultivate pot