The Union Electric-operated plant first came online in 1923; it was built in stages and completed in 1939. Designed to burn Illinois coal, it was the largest power plant in the Mississippi Valley when it opened. Its boilers consumed a ton of coal every 30 seconds, and over 600 million gallons of water a day. Underwater cables fed the electricity produced to the thriving city across the river. The plant later converted to oil burning.
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The site today is home to Cahokia Marine Services, a multi-modal transportation business run by SLAY Industries; it functions as a bulk commodity transfer site, loading river barges. The site offers a large volume of indoor storage, presumably referring to the power plant building.