Companies that operate water supply systems (including pumping stations, aqueducts, distribution mains, and other facilities) used to provide water for drinking, irrigation, or other purposes.

Companies that provide biological, physical, agricultural, social, clinical, technological, and other research services; and companies that provide scientific testing, consumer testing, geological and seismic testing, and other testing services.

Companies that specialize in performing business, consumer, environmental, and other activities for companies, households, or individuals in exchange for fees; and associations that promote the interests of their members including business and non-business associations or groups.

Companies that produce water from various sources (sea, rivers, wells, waste water) and render it suitable for drinking, irrigation, and/or industrial use.

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 fossil fuel into electric power; including generation facilities that use fossil fuels (such as coal, oil, or gas) to produce electric energy; electric energy is then provided to electric power transmission or electric power distribution systems.

Companies that operate facilities that remove soluble salts from water to render it suitable for drinking, irrigation, or industrial uses.

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 provide various business services to their clients (including advertising, auctions, business consulting, commercial cleaning, legal, public relations, repair and maintenance, security, translation and interpretation, staffing, survey and statistics, technical and scientific research, fairs and exhibitions, parking facility management).

Companies that operate water supply systems and/or waste water treatment systems to provide water, desalinated water, and/or waste water treatment services.

Companies that engage in the generation, transmission, and distribution of electricity for sale in regulated markets.