Calculation details

Surplus

Demand > 0: LCS = (VoLL-Price) x Cleared Demand

Demand < 0: GS = -Price x Cleared Demand

Scheduled generation (GIP): GS = (Price x ClearedGeneration) -

ΣiClearedGenerationi x OfferPricei

Benefit

Demand > 0: Max[0, LCSSolve1 – LCSSolve2]

Demand < 0 and GIP: Max[0, GSSolve1 – GSSolve2]

SPD charge (by trade period)

SPDChargeRatio =

Min[1, TRR/ΣgBenefitg]

SPDChargeg = SPDChargeRatio x Benefitg

LCS = Load customer surplus GS = Generation surplus GIP = Grid injection point TRR = Transmission revenue requirement