Pub. Util. Code, § 246

A person or corporation shall not be a public utility subject to the jurisdiction, control and regulation of the commission and the provisions of this part solely because such person or corporation owns or controls any electric plant (a) which is leased or held for lease or sale to any public utility, or (b) the operation and use of which is vested by lease or other contract in a public utility, or (c) for a period of not more than 90 days after termination of any lease or contract with a public utility or after repossession of such property following a breach of such lease or contract. The commission may upon application issue its order approving the terms of any such lease or contract for the purpose of qualifying such person or corporation for an exemption by the Securities and Exchange Commission of the United States from the federal Public Utility Holding Company Act of 1935, as amended (Chapter 2C (commencing with Section 79) of Title 15, United States Code). This section shall apply only to persons or corporations for which such lease or contract was approved by the commission prior to January 1, 1979. Nothing in this section shall alter or modify the authority of the commission to regulate the rates and service of a person or corporation which is a public utility subject to the provisions of this part.