Picture 4-6.
The power plant in 1894.  This is probably its original form.  According to the local newspapers, it was under construction from October 1892 to November 1893.  It was built over its predecessor, a former sugar factory, with no interruption in service.  When the new building was complete, the old sugar factory inside it was torn down and removed.  The structure was added to many times over the years.  The building seen partially at the left in this picture is the Tremont Street car barn. C. Trego and O. E. Goldschmidt, Tests of Efficiency of the U. & C. Electric Street Railway, University of Illinois thesis, 1894