Cornerstone Energy provides natural gas commodity and energy related services to commercial and industrial end-users throughout the Mid-Continent United States.Cornerstone Energy is owned and operated by Constellation Energy, a Fortune 125 energy company. Constellation Energy is a leading supplier of natural gas and electricity to commercial and industrial customers throughout North America.Providing exemplary service to our customers is the top priority of Cornerstone. Our commitment to you is to deliver on our promises, providing energy solutions that are of the highest quality, reliable, and cost effective.Cornerstone purchases over 120 billion cubic feet (BCF) of natural gas on an annual basis. The mass quantities of natural gas purchased places Cornerstone in a distinct class, allowing Cornerstone to procure gas for its customers at the lowest possible cost. Cornerstone enjoys a unique supply arrangement with Constellation Energy Commodities Group, one of the largest and most respected energy wholesale suppliers in the nation.Cornerstone is very active in the capacity release market, purchasing released firm capacity on behalf of its customer base. Cornerstone is also a holder of firm transportation on multiple pipelines allowing Cornerstone to offer firm transportation alternatives to its customers.