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§ 1036.740 Restrictions for using emission credits.
The following restrictions apply for using emission credits:
(a) Averaging sets. Except as specified in paragraph (c) of this section, emission credits may be exchanged only within the following averaging sets based on primary intended service class:
(1) Spark-ignition HDE.
(2) Light HDE.
(3) Medium HDE.
(4) Heavy HDE.
(b) Applying credits to prior year deficits. Where your CO2 credit balance for the previous year is negative, you may apply credits to that deficit only after meeting your credit obligations for the current year.