anchor: (5)(A) The term baseline heat input means, except under subpart 1 of part B and section 407, the average annual heat input used by a unit during the three years in which the unit had the highest heat input for the period 1997 through 2001.
positive: Baseline heat input is measured over a 3 year period.
negative: The baseline heat input is the lowest annual heat input over 3 years.