The Colorado Supreme Court says opponents can proceed with a lawsuit over converting some coal plants to natural gas.
Xcel Energy Inc. says a new wind energy forecasting system developed by national scientists is saving it money by helping it predict when it can power down its natural gas-fired power plants and rely on wind turbines to generate electricity instead.
The governors of Colorado, Oklahoma, Pennsylvania and Wyoming have agreed to work together to encourage U.S. automakers to develop affordable natural-gas vehicles.
Black Hills Energy is proposing that a new natural-gas-fired power plant replace two coal-fired units in southern Colorado.
Colorado regulators are sticking to their decision to approve plans for Xcel Energy to retire some of its coal-fired power plants and switch others to run on natural gas.