Businesses nationwide responded to the preferences of customers and investors alike by spending more on renewable energy.
An Associated Press investigation found there could be more premature deaths, greenhouse gas emissions and other impacts.
A third of all of Colorado's carbon emissions come from cars and other vehicles.
The lithium ion battery will provide power on days when wind and solar don't produce enough.
The president of Xcel's Colorado operations answered questions about the road to come.
The rural electricity provider in Colorado coal country is parting ways because Tri State is too closely tied to fossil fuels.
Homeowners could offset that increase in fees by installing renewable energy systems.
A carbon dioxide test center in Wyoming captures CO2 from burning coal before it enters the atmosphere.
From 100 renewable energy goals, to electric cars and even the race for governor, green energy may be on the tip of our tongues this year.
Weld County Commissioners say the Heartland Biogas Project does not have a valid permit to operate.