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Mathematical Algorithms for Calculation of ATC for Schedule 21-VTransco Planning Horizon

Planning Horizon

ATC_F = (TTC-CBM-TRM-ETC_F)

ATC_NF = (TTC-CBM-TRM- ETC_F- ETC_NF )

Operating Horizon

ATC_F = (TTC-CBM-TRM-ETC_F)

ATC_NF = (TTC-CBM-TRM- ETC_F- ETC_NF + Postbacks_NF)

Scheduling Horizon

ATC_F = 0

ATC_NF = TTC

VTransco performs the above calculations for its non-PTF internal interfaces. These calculations are consistent with the ISO calculations for Available Transfer Capability. TRM and CBM for VTransco’s non-PTF posted paths are zero.