Companies with seasonally-differentiated base rates shall calculate bills to customers in accordance with 220 CMR 6.09 except that GAFs shall be computed using seasonal embedded gas costs as determined in a company's last general rate case.
Companies for which seasonal embedded costs have not been determined in a rate case, but whose base rates are seasonally differentiated, shall calculate seasonal embedded costs. This shall be accomplished by disaggregating the nonseasonal embedded gas cost figure as set in a company's last rate case into appropriate Peak Embedded Gas Cost and Off-peak Embedded Gas Cost components, subject to the approval of the Department.
220 CMR 6.10