Companies that provide electric power, natural gas, steam supply, water supply, and sewage removal through a permanent infrastructure of lines, mains, and pipes.
Companies that operate power plants for converting nuclear power into electric power; electric energy is then provided to electric power transmission or electric power distribution systems.
Companies that operate facilities for electric power generation, so as to convert forms of energy (including hydroelectric, fossil fuels, and nuclear power) into electrical energy. The sector includes companies that produce electric energy and provide electricity to transmission systems or to distribution systems.
Companies that engage in the generation, transmission, and distribution of electricity for sale in regulated markets.