sentence1: In general, if that emission level is exceeded in 2018 or later, the trading program, which reflects the back-stop trading program already developed by the WRAP and is modeled after the new nationwide sulfur dioxide trading program, will require a separate set of allowances for affected EGUs in the WRAP State to be held covering emissions starting the third year after the level is exceeded.
sentence2: If that emission level is exceeded in 2023 or later, it will require a separate set of allowances.