| http://www.w3.org/ns/prov#value | - Modified fossil fuel-fired EGUs (i.e., utility boilers and integrated gasification combined cycle (IGCC) units): the source must meet a EGU-specific emission limit (a) determined by the EGU???s best historical annual CO2 emission rate from 2002 to the date of modification, plus an additional 2 percent emission reduction, or (b) determined depending on whether the modification occurs before or afte
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