California Code, Public Utilities Code - PUC § 2931

The question whether any municipal corporation shall retain its powers of control respecting one or more classes of public utilities may be submitted to the qualified electors of the municipal corporation, as provided in this chapter, either at a general municipal election or at a special election.

The question may be submitted, either (a) in pursuance of an ordinance of intention adopted by a vote of three-fifths of all the members of the legislative body of the municipal corporation, declaring that the public interest requires the submission of, and that it is the intention of the legislative body to submit the question to a vote of the qualified electors of the municipal corporation or (b) in pursuance of a petition of qualified electors of the municipal corporation.