Business Directory Utilities CALPINE ENERGY SOLUTIONS1901 Butterfield Rd.Downers Grove, IL 60515Phone: (954) 461-6964Send EmailMember Since: 2023See Also Energy, Energy Conservation Consultants ILLINOIS AMERICAN WATER1000 Internationale ParkwayWoodridge, IL 60517Phone: (630) 739-8864Fax: (630) 739-0477Send EmailMember Since: 2006See Also Water Company, Environmental NICOR GAS1844 W. Ferry Rd.Naperville, IL 60563Phone: (888) 642-6748 Send EmailMember Since: 2007See Also Energy