(a) This section applies only to reciprocating internal combustion engines that are part of processing, treating, compression, or pumping facilities affected by § 382.0518(g) connected to or part of a gathering or transmission pipeline. Pipeline facilities affected by § 382.0518(g) other than reciprocating internal combustion engines may apply for an existing facility permit or other applicable permit under this chapter other than a pipeline facilities permit.
(b) The commission by rule shall:
(1) provide for the issuance of a single permit for all reciprocating internal combustion facilities connected to or part of a gathering or transmission pipeline;
(2) provide for a means for mandatory emissions reductions for facilities permitted under this section to be achieved:
(A) at one source; or
(B) by averaging reductions among more than one reciprocating internal combustion facility connected to or part of a gathering or transmission pipeline; and
(3) allow an owner or operator to apply for separate permits under this section for discrete and separate reciprocating internal combustion facilities connected to or part of a gathering or transmission pipeline.

(c) If the mandatory emissions reductions under this section are to be achieved by averaging reductions among more than one source connected to or part of a gathering or transmission pipeline, the average may not include emissions reductions achieved in order to comply with other state or federal law.
(d) If the mandatory emissions reductions under this section are to be achieved at one source, the reduction may include emissions reductions achieved since January 1, 2001, in order to comply with other state or federal law.
(e) The commission shall grant a permit under this section for a facility or facilities located in the East Texas region if, from information available to the commission, the commission finds that the conditions of the permit will require a 50 percent reduction of the hourly emissions rate of nitrogen oxides, expressed in terms of grams per brake horsepower-hour. The commission may also require a 50 percent reduction of the hourly emissions rate of volatile organic compounds, expressed in terms of grams per brake horsepower-hour.
(f) The commission shall grant a permit under this section for facilities located in the West Texas region if, from information available to the commission, the commission finds that the conditions of the permit will require up to a 20 percent reduction of the hourly emissions rate of nitrogen oxides, expressed in terms of grams per brake horsepower-hour. The commission may also require up to a 20 percent reduction of the hourly emissions rate of volatile organic compounds, expressed in terms of grams per brake horsepower-hour.
(g) A permit application under this section is subject to notice and hearing requirements as provided by § 382.05191.
(h) A person planning the modification of a facility previously permitted under this section must comply with § 382.0518 before modifying.
(i) The commission may adopt rules as necessary to implement and administer this section.
(j) A reciprocating internal combustion engine that is subject to this section and to a mass emissions cap as established by commission rule is considered permitted under this section with respect to all air contaminants if the facility is:
(1) located in an area designated nonattainment for an ozone national ambient air quality standard; and
(2) achieving compliance with all state and federal requirements designated for that area.