Black Hills Energy receives regulatory approval to increase revenues Black Hills Corp. subsidiary Black Hills Energy received approval from the Colorado Public Utilities Commission for an estimated $3M per year in additional revenue, effective Jan. 1, 2015. The new rates provide a return on additional capital investments made in 2012 and 2013 totaling $54M by the utility to maintain and enhance its electrical service infrastructure since the last rate case, in 2012. Those investments include the 29-megawatt Busch Ranch Wind Farm south of Pueblo, in operation since October 2012. The new natural gas-fired turbine at the company's Pueblo Airport Generating Station will replace the coal-fired W.N. Clark power plant. The new turbine is expected to begin commercial operation in early 2017.