Section 519 - Construction of electric generating units fueled by oil or natural gas(a) General rule.--Only upon the application of a public utility and the approval of the application by the commission shall it be lawful for the utility to begin the construction of an electric generating unit fueled by oil or natural gas.(b) Review by commission.--Every application shall be made to the commission, in writing, and shall be in the form and contain the information the commission requires by its regulations. The commission shall approve an application if, after reasonable notice and hearing, the affected public utility proves, and the commission finds, any of the following: (1) There are no reasonably available sites on which a unit or units of comparable capacity fueled by coal, a synthetic derived in whole or in part from coal or a mixture which includes coal or is derived in whole or in part from coal could be operated in compliance with present and reasonably anticipated environmental laws and regulations.(2) There is a strong probability that construction and subsequent operation of a unit or units of comparable capacity fueled by coal, a synthetic derived in whole or in part from coal or a mixture which includes coal or is derived in whole or in part from coal would be more costly to ratepayers over the useful life of the nonoil or nongas unit or units than would construction and subsequent operation of the unit proposed by the utility.(c) Environmental questions.--The commission may certify, to the Department of Environmental Resources, any question regarding the applicability of environmental laws and regulations, when the question arises in a proceeding under this section, and may incorporate the department's findings in its decision.(d) Time limit on commission review.--If the commission fails to approve or disapprove an application within six months after the date on which the application is filed, it shall be lawful for the affected utility to construct the proposed electric generating unit as though the commission had approved the application.(e) Capacity determinations.--This section does not authorize the commission to review the affected public utility's determination that there is a need to construct a new electric generating unit of the capacity and by the in-service date proposed by the utility and does not supersede a decision by the commission under some other provision of law that there is, or was, not a need to construct a new electric generating unit of the capacity and by the in-service date proposed by the utility.(f) Mixture with oil or natural gas.--For the purposes of this section, the phrase "mixture which includes coal or is derived in whole or in part from coal" includes, but is not limited to, both the intermittent and the simultaneous burning of oil or natural gas with coal or a coal derivative if the intermittent or simultaneous burning of oil or natural gas would:(1) lower the cost, to the ratepayers, of using coal or a coal derivative; or(2) enable coal or a coal derivative to be burned in compliance with present and reasonably anticipated environmental laws and regulations.1984, Dec. 21, P.L. 1240, No. 234, § 1, imd. effective. Amended 1984, Dec. 21, P.L. 1270, No. 241, § 2, effective in 60 days.