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 Elsie and Jack Photograph of Elsie and Jack standing outside of a house.