(a) When any electric plant or portion thereof constituting a distinct operating unit is purchased, the constituent elements thereof shall be appraised on the basis of original cost (see § 196.1, subd. [a][33]) and a copy of such appraisal forwarded to the commission together with proposed journal entries allocating such original cost to the appropriate operating property or other accounts according to the nature of the property acquired. Such entries shall also cover any additional assets acquired or liabilities assumed and any incidental expenditures incurred in connection with the transaction. Full supporting details, including the purchase price and amount of contributions for extensions, if any, shall be furnished with such proposed entries.

(b) Accrued depreciation and amortization to date of purchase shall be determined, and a verified statement relative thereto, together with full supporting details, shall be submitted.

(c) Pending approval of the proposed journal entries, the cost of the electric plant and expenditures incidental to its purchase shall be carried in a suitably designated subdivision of account 145, Miscellaneous Suspense, or, upon order of the commission, in account 392, Undistributed Operating Property, and allocation to operating property and other accounts shall be made only upon order of the commission.

(d) In a transaction involving the transfer and acquisition of property, the purchaser shall have available, so far as possible, all existing records and other evidence relating to the purchase, construction, and improvement of the property involved.