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utility, public, industry required by law to render adequate service in its field at reasonable prices to all who apply for it. Public utilities frequently operate as monopolies in their market. In the United States, public utilities are most commonly involved in the business of supplying consumers with water, electricity, telephone, natural gas, and other necessary services. Such an industry is said to be "affected with a public interest" and therefore subject to a degree of government regulation from which other businesses are exempt.
Opinions differ as to the characteristics that an industry must possess to merit classification as a public utility, since all industries in a sense serve the public. By its nature a public utility is often a monopoly and as such is not prevented by competing companies from charging exorbitant prices. It usually operates under a license or franchise by which it enjoys special privileges, such as the right of eminent domain. Finally, it may supply an essential service, such as water or light, the unavailability of which would injuriously affect public health and welfare. From an early period there was public regulation of canals, turnpikes, toll roads and ferries, inns, gristmills, and pawnshops. Docks, sleeping cars, commodity exchanges, warehouses, insurance companies, banks, housing, milk, coal mines, and (in the 20th cent.) broadcasting, are other types of goods and services held to be affected with public interest. Important utilities that satisfy the vital needs of large populations include water, gas, and electric companies; transportation facilities, such as subways, bus lines, and railroads; and communication facilities, such as telephones and telegraphs. In most European nations such industries have often been owned by the state, although many have been privatized in recent years. In the United States, however, many public utilities are privately owned.
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