§ 1039.740 What restrictions apply for using emission credits?

The following restrictions apply for using emission credits:

(a) Averaging sets. Emission credits may be exchanged only within an averaging set. For emission credits generated by Tier 4 engines, there are two averaging sets—one for engines at or below 560 kW and another for engines above 560 kW.

(b) Emission credits from earlier tiers of standards. (1) For purposes of ABT under this subpart, you may not use emission credits generated from engines subject to emission standards identified in appendix I of this part, except as specified in § 1039.102(d)(1) or as follows: