ALLETE, Inc. operates as an energy company. The company operates through Regulated Operations, ALLETE Clean Energy, and Corporate and Other segments. It generates electricity from coal-fired, hydroelectric, natural gas-fired, biomass co-fired, and solar. The company provides regulated utility electric service in northeastern Minnesota to approximately 145,000 retail customers, as well as 15 non-affiliated municipal customers; and regulated utility electric, natural gas, and water services in northwestern Wisconsin to approximately 15,000 electric customers, 13,000 natural gas customers, and 10,000 water customers. It also owns and maintains electric transmission assets in Wisconsin, Michigan, Minnesota, and Illinois. In addition, the company focuses on developing, acquiring, and operating clean and renewable energy projects; and owns and operates approximately 660 megawatt of wind energy generation. Further, it is involved in the coal mining operations in North Dakota; and real estate investment activities in Florida. The company owns and operates 158 substations with a total capacity of 8,875 megavoltamperes. The company was formerly known as Minnesota Power, Inc. and changed its name to ALLETE, Inc. in May 2001. ALLETE, Inc. was incorporated in 1906 and is headquartered in Duluth, Minnesota.