Alliant Energy Corporation is a public utility holding company headquartered in Madison, Wisconsin, providing power in Iowa and Wisconsin.

An energy crisis or energy shortage is any significant bottleneck in the supply of energy resources to an economy. In literature, it often refers to one of the energy sources used at a certain time and place, in particular, those that supply national electricity grids or those used as fuel in industrial development.

DCC Energy plc (formerly DCC plc) is a multi-energy sales and distribution business operating in Europe and the US. Headquartered in Dublin, DCC Energy plc is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index.

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Opus Energy Limited supplied gas and electricity to businesses across the United Kingdom. It purchases electricity from wind, solar, hydro, and anaerobic digestion generators, and provides support to develop energy-generating sites.

NextEra Energy, Inc. is an American energy company that is the world's largest electric utility holding company by market capitalization, with a valuation of over $187 billion as of July 2026.