(a) No public utility shall, as to rates or services, make or grant any unreasonable preference or advantage to any person or subject any person to any unreasonable prejudice or disadvantage. No public utility shall establish or maintain any unreasonable difference as to rates or services either as between localities or as between classes of service. The Commission may determine any questions of fact arising under this section; provided that it shall not be an unreasonable preference or advantage or constitute discrimination against any person, firm or corporation or general rate payer for telephone utilities to contract with motels, hotels and hospitals to pay reasonable commissions in connection with the handling of intrastate toll calls charged to a guest or patient and collected by the motel, hotel or hospital; provided further, that payment of such commissions shall be in accordance with uniform tariffs which shall be subject to the approval of the Commission. Provided further, that it shall not be considered an unreasonable preference or advantage for the Commission to order, if it finds the public interest so requires, a reduction in local telephone rates for low-income residential consumers meeting a means test established by the Commission in order to match any reduction in the interstate subscriber line charge authorized by the Federal Communications Commission. If the State repeals any State funding mechanism for a reduction in the local telephone rates for low-income residential consumers, the Commission shall take appropriate action to eliminate any requirement for the reduced rate funded by the repealed State funding mechanism. For the purposes of this section, a State funding mechanism for a reduction in the local telephone rates includes a tax credit allowed for the public utility to recover the reduction in rates.
Nothing in this section prohibits the Commission from establishing different rates for natural gas service to counties that are substantially unserved, to the extent that those rates reflect the cost of providing service to the unserved counties and upon a finding by the Commission that natural gas service would not otherwise become available to the counties.