California Code, Public Resources Code - PRC § 25331

(a) The commission may designate a transmission corridor zone on its own motion or by application of a person who plans to construct a high-voltage electric transmission line within the state.  The designation of a transmission corridor zone shall serve to identify a feasible corridor where one or more future high-voltage electric transmission lines can be built that are consistent with the state's needs and objectives as set forth in the strategic plan adopted pursuant to Section 25324.

(b) A person planning to construct a high-voltage electric transmission line may submit to the commission an application to designate a proposed transmission corridor zone as being consistent with the strategic plan adopted pursuant to Section 25324.  The application shall be in the form prescribed by the commission and shall be supported by any information that the commission may require.