State Line Generating Unit 1***

#24 – State Line Generating Unit 1

world's largest electric-power generator for nearly 25 years, achieving many design firsts

Dwarfing the typical electric-power generators of the day, this unit represented 14 percent of the entire Chicago metropolitan district when it was placed in commercial service on April 8, 1929. It was the first unit to use five stages of feed-water heating, was first to produce 650 pounds of pressure steam for electric generation, and was an original design in that the metal-enclosed generator bus is housed outdoors.

From 1929 to 1954 the "State Line" turbine-generator, located on the Indiana-Illinois border, was the largest unit of its kind in the world. Its 208,000 kilowatt rating was 30 percent above the next largest unit at that time. In December of 1953 the Ohio Power Company's Muskingham #1 unit surpassed the "champ" with a rating of 213,000 kilowatt. In an industry which had doubled its output at less than ten-year intervals, a twenty-five-year reign represented a substantial engineering feat.

State Line Generating Unit 1 Photo An interior view of State Line
Generating Unit 1

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Landmark Location

Commonwealth Edison Co.
103d St. and Lake Michigan,
Hammond, IN 46320

Visiting Info

Unaccessible. Dismantled and sold as scrap

Ceremony Notes

April, 1977