Cal. Public Utilities Code § 320

The Legislature hereby declares that it is the policy of this state to achieve, whenever feasible and not inconsistent with sound environmental planning, the undergrounding of all future electric and communication distribution facilities which are proposed to be erected in proximity to any highway designated a state scenic highway pursuant to Article 2.5 (commencing with Section 260) of Chapter 2 of Division 1 of the Streets and Highways Code and which would be visible from such scenic highways if erected above ground. The commission shall prepare and adopt by December 31, 1972, a statewide plan and schedule for the undergrounding of all such utility distribution facilities in accordance with the aforesaid policy and the rules of the commission relating to the undergrounding of facilities. The commission shall coordinate its activities regarding the plan with local governments and planning commissions concerned. The commission shall require compliance with the plan upon its adoption. This section shall not apply to facilities necessary to the operation of any railroad.