California Code, Public Utilities Code - PUC § 185504

(1) In the amount of any betterment to the utility facility resulting from the removal or relocation, not in excess of the cost of the increased capacity of the facility.

(2) The salvage value of any materials or parts salvaged and retained by the utility.

(3) If a new utility facility or portion of that facility is constructed to accomplish the removal or relocation, an allowance of an amount equal to the same proportion of the original cost of the displaced utility facility or portion of that facility as the age of the facility bears to the normal expected life of the facility.