Companies that have not yet implemented seasonally differentiated base rates shall employ the GAFs as follows. The off-peak season rates to customers shall be calculated by adding the off-peak GAF (summer base GAF) to the base rate for each rate class. The peak season rates shall be calculated by adding the peak GAF (winter base GAF plus supplemental GAF) to the base rate for each rate class. The seasonal GAFs ($/therm or CCF) shall be calculated to the nearest hundredth of a cent per unit.
220 CMR, § 6.09