Cal. Pub. Util. Code § 1006

When a complaint has been filed with the commission alleging that a public utility of the class specified in Section 1001 is engaged or is about to engage in construction work without having secured from the commission a certificate of public convenience and necessity as required by this article, the commission may, with or without notice, make its order requiring the public utility complained of to cease and desist from such construction until the commission makes and files its decision on the complaint or until the further order of the commission.