In 1995, shareholders of both CIPSCO Inc. and another utility twice its size, the S&P 500-listed Union Electric Company, approved the merger of the two companies.
In 1909 Union Electric began selling electric cars in the automobile business, and became the St. Louis agent for Studebaker and Rauch & Lang automobiles.
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IES expanded across that part of Iowa south of IPC's territory, eventually acquiring the Iowa operations of the Union Electric Company of St. Louis, MO.
Ameren Corporation was created December 31, 1997 by the merger of Missouri's Union Electric Company (formerly NYSE: UEP) and the neighboring Central Illinois Public Service Company (CIPSCO Inc. holding, formerly NYSE: CIP).