public utility

Definition from Nolo’s Plain-English Law Dictionary

Any organization which provides services to the general public, although it may be privately owned. Public utilities include electric, gas, telephone, water, and television cable systems, as well as streetcar and bus lines. Public utilities are allowed certain monopoly rights because of the practical need to service entire geographic areas with one system, but they are regulated by state, county, and city public utility commissions under state laws.

Definition provided by Nolo’s Plain-English Law Dictionary.