The commission:
In every case in which the commission chooses to have the audit provided for in this subdivision performed by independent auditors, it shall have authority to select the auditors and to require the corporation being audited to enter into a contract with the auditors providing for their payment by such corporation. Such contract shall provide further that the auditors shall work for and under the direction of the commission according to such terms as the commission may determine are necessary and reasonable.
The commission shall have authority to direct the corporation to implement any recommendations resulting from such audits that it finds to be necessary and reasonable.
Upon the application of a water-works corporation for a major change in rates as defined in subdivision ten of this section, the commission shall review the corporation's compliance with the directions and recommendations made previously by the commission, as a result of the most recently completed management and operations audit undertaken pursuant to the provisions of this subdivision. The commission shall incorporate the findings of such review in its opinion or order.
N.Y. Pub. Serv. Law § 89-C