The Federal Energy Regulatory Commission may exempt from any provisions in sections 4, 5, and 7 of the Natural Gas Act (15
, and 717f
) and titles II and IV of the Natural Gas Policy Act of 1978 (15
) the sale or transportation, by any public utility, local distribution company, interstate or intrastate pipeline, or any other person, of any natural gas which is determined (in the case of a regulated utility, company, pipeline, or person) by the State regulatory authority having rate-making authority over such utility, company, pipeline, or person, or (in the case of a nonregulated utility, company, pipeline, or person) by such utility, company, pipeline, or person, to have been conserved because of a prototype residential energy efficiency program which is established under a plan approved under section
of this title, if the Commission determines that such exemption is necessary to make feasible the demonstration of such prototype residential energy efficiency program.