(a) All amounts included in subaccounts 1301-1390 of accounts 1101 to 1104 for electric plant (except as otherwise provided in account 1302, Franchises and Consents shall be the original cost (see section 180.1[a][9] of this Title) of such electric plant. (See also paragraphs B and C of account 1106.)

(b) When the term cost is used in the detailed electric plant accounts (1301-1390), it shall mean the original cost unless otherwise specified and shall include not only the materials, supplies, labor, services and other items consumed or employed in the construction and installation of electric plant, but also the cost of preliminary studies, plans, surveys, engineering, supervision and general expenses, which contribute directly and immediately to electric plant without duplication of such costs.

(c) When the consideration given for property is other than cash, the value of such consideration shall be determined on a cash basis. In the entry recording such transaction the actual consideration shall be described with sufficient particularity to identify it. The utility shall be prepared to furnish the commission the particulars of its determination of the cash value of the consideration, if other than cash.

(d) When property is purchased under a plan involving deferred payments, no charge shall be made to the electric plant accounts for interest, insurance, or other expenditures occasioned solely by such form of payment.

(e) Electric plant contributed to the utility or constructed by it from contributions to it of cash or its equivalent shall be charged to the electric plant accounts at cost (see section 180.1[a][6] of this Title) to the utility (i.e., original cost less the portion thereof contributed by or on behalf of customers). Records shall be kept so that the utility can readily furnish information as to the source, purpose, and amount of each contribution, the property to which each contribution relates, and the conditions, if any, upon which each contribution was made.

Amounts received for construction which are ultimately to be refunded, wholly or in part, shall be credited to account 1241, Customer Advances for Construction. When the amount to be refunded has been finally determined, the balance, if any, remaining in account 1241 shall be debited thereto and credited to the electric plant accounts to which the cost of the property was charged.