Browse Items (1 total) Tags: Substation Browse All Browse by Tag Search Items Sort by: Title Creator Date Added Photos of Illinois Power Co. Transmission Substation and the Illinois Power Co. office building. Photograph of the Illinois Power Co. Substation. Photo of the Illinois Power Co. office building on E. Main St., Decatur, IL. Tags: Buildings, Business, Decatur IL., E. Main St., Illinois Power Co., Noel C. Dicks, Office Building, Photo File: Business, Power Company, Substation Featured Item Decatur Public Library Board of Trustees Meeting October 17,2020 Monthly Meeting Board of Trustees, Decatur Public Library, on October 17, 2002.