; or (ii) the District of Columbia; and (B) have experience relating to public utility proceedings. (2) Duties The Director shall coordinate assistance made available to— (A) the public, with respect to authorities exercised by the Commission; and (B) individuals and entities intervening or participating, or proposing to intervene or participate, in proceedings before the Commission. (3) Compensation and powers (A) Compensation The Director shall be compensated at a rate equal to the daily equivalent of the annual rate of basic pay prescribed for level IV of the Executive Schedule under section 5315 of title 5, United States Code. (B) Powers The Director may— (i) employ at the Office— (I) not more than 125 full-time professional employees at appropriate levels of the General Schedule; and (II) such additional support personnel as the Director determines to be necessary; and (ii) procure for the Office such temporary and intermittent services as the Director determines to be necessary. (d) Powers of Office The Office may— (1) intervene, appear, and participate, in accordance with this section, in administrative, regulatory, or judicial proceedings on behalf of energy customers with respect to any matter concerning the rates, charges, prices, tariffs, or service of public utilities and natural gas companies, or natural gas siting and infrastructure development, under the jurisdiction of the Commission by representing the interests of the energy customers— (A) on any matter before the Commission concerning rates or service of such a public utility or natural gas company; or (B) as amicus curiae in— (i) a review in any United States court of a ruling by the Commission in such a matter; or (ii) a hearing or proceeding in any other Federal regulatory agency or commission relating to such a matter; (2) support public participation in the siting and permitting of natural gas storage and distribution infrastructure under the jurisdiction of the Commission