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The company's history in the Madison area date back more than 150 years. In 1888, as the renamed Madison Electric Co., it began delivering electric service. In 1892, the Four Lakes Light and Power Co. succeeded Madison Electric Co. and operated as Madison's electricity provider for the next four years. In 1896, the local utility incorporated to become Madison Gas and Electric Co.
In 2001, the company formed a holding company named MGE Energy, Inc. − and Madison Gas and Electric Co. became its main subsidiary.