Oxford Dictionary definition of monopoly follows. Simply because an exclusive provider of a good or service is regulated does not mean that it is not a monopoly. It becomes a regulated monopoly.
"noun (plural monopolies)
1the exclusive possession or control of the supply of or trade in a commodity or service: the state’s monopoly of radio and television broadcasting
a company or group having exclusive control over a commodity or service: passenger services were largely in the hands of state-owned monopolies France’s electricity monopoly, EDF
a commodity or service in the exclusive control of a company or group: electricity, gas, and water were considered to be natural monopolies
[usually with negative] the exclusive possession, control, or exercise of something: men don’t have a monopoly on unrequited love"
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