Business Directory Energy CALPINE ENERGY SOLUTIONS1901 Butterfield Rd.Downers Grove, IL 60515Phone: (954) 461-6964Send EmailMember Since: 2023See Also Utilities, Energy Conservation Consultants DACOTT ENERGY SERVICES, LTD.2001 Butterfield Rd., Suite 105Downers Grove, IL 60515Phone: (713) 664-8600Fax: (713) 664-8614Send EmailMember Since: 2017See Also Consultants - Business NICOR GAS1844 W. Ferry Rd.Naperville, IL 60563Phone: (888) 642-6748 Send EmailMember Since: 2007See Also Utilities