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Companies that produce or distribute electricity. Includes both nuclear and non-nuclear facilities.

Companies whose main charter is to distribute and transmit natural and manufactured gas. Excludes companies primarily involved in gas exploration or production classified in the Oil & Gas Exploration & Production Sub-Industry. Also excludes companies engaged in the storage and/or transportation of oil, gas, and/or refined products classified in the Oil & Gas Storage & Transportation Sub-Industry.

Utility companies with significantly diversified activities in addition to core Electric Utility, Gas Utility, and/or Water Utility operations.

Companies that purchase and redistribute water to the end-consumer. Includes large-scale water treatment systems.

Companies that operate as Independent Power Producers (IPPs), Gas & Power Marketing & Trading Specialists, and/or Integrated Energy Merchants. Excludes producers of electricity using renewable sources, such as solar power, hydropower, and wind power. Also excludes electric transmission companies and utility distribution companies classified in the Electric Utilities Sub-Industry.

Companies that engage in the generation and distribution of electricity using renewable sources, including, but not limited to, companies that produce electricity using biomass, geothermal energy, solar energy, hydropower, and wind power. Excludes companies manufacturing capital equipment used to generate electricity using renewable sources, such as manufacturers of solar power systems, installers of photovoltaic cells, and companies involved in the provision of technology, components, and services mainly to this market.