Browse Items (1 total) Tags: Power Company Browse All Browse by Tag Search Items Sort by: TitleCreatorDate 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 Last Snapshot at Maxwell Place: Aunt Marie's Birthday Cake Photograph of Aunt Marie Maxwell cutting her birthday cake at Maxwell Place.