(a) Each utility (see section 196.1[a][44] of this Part) shall keep a complete set of accounting books concerning the electric plant and the operations thereof, separate and distinct from other municipal accounts and transactions, except that such books may also include the entries for any other property or operations subject to the jurisdiction of the commission; and all other books and records which support in any way the entries to such accounting books so that it can readily furnish at any time full information as to any account. Moreover, it shall support each entry to each account with such detailed information as will provide a ready analysis, identification, and verification of the facts recorded therein.

(b) The books referred to herein include not only books of account in a limited technical sense but all other records such as minute books, resolutions or ordinances or minutes of municipal bodies, records of elections relating to the municipal utility, and working papers, engineering studies, operating records, etc., which will be useful in developing the history of any transaction or authorization.

(c) Except as authorized by the commission, all operating, accounting, or financial papers, records, books, invoices, stubs, maps, or documents shall be retained permanently.

(d) All such records shall be accessible, at all times, to the authorized representatives of the commission at a location within the State of New York.