Amy made her reasons pretty clear:

"Between 2001 and 2014, the cost of electricity in Colorado has shot up 67 percent, or double the rate of inflation, despite flat consumption and falling fuel costs. Xcel has continued to profit in that period and environmental groups have gotten what they wanted. Ratepayers have been hit with electricity cost increases far beyond income gains, which suggests a planning and procurement process that isn’t protecting their interests, argues the Independence Institute, a libertarian group."