The Commission shall provide for the examination and audit of all accounts, and all items shall be allocated to the accounts in the manner prescribed by the Commission. The agents, accountants, or examiners employed by the Commission shall have authority, under the direction of the Commission, to inspect and examine any and all books, accounts, papers, records, and memoranda kept by such public utility.
D.C. Code § 34-1114
Investigations of public utilities, assessing expenses, see § 34-912. Investigations of public utility books and officers by Commission, see § 34-904. Rules and regulations, power of Commission to adopt, see § 34-902. .