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For power plants with constant tailwater elevation; i.e., based on elevation of the power
plant, mean effective head H it is calculated as:
(
)
H it = 0.5 ⋅ Ei ( Sit ) + Ei ( Si,t +1) − EPi
(11)
where EPi is power plant elevation (Plant Elevation Type: Constant) and Ei ( Sit ) is
water surface elevation at the beginning of period t as interpolated from the areacapacity-elevation table for reservoir i.
For power plants influenced by tailwater elevations:
(
)
H it = 0.5 ⋅ Ei ( Sit ) + Ei ( Si,t +1) − TWi (Qit )
(12)
where TWi ( Qit ) is tailwater elevation interpolated from the outflow-elevation table for
reservoir i (Plant Elevation Type: Variable).
Energy Generation. On-peak energy generation (MWH) is calculated as:
Eitp = Pit ⋅ ΔTitp
(13)
Qit
where ΔTitp is total hours of on-peak generation in time period t, entered into the Power
form under the Reservoir Node Properties form by clicking the Generating Hours.
ΔTitp
Off-peak energy is calculated as:
Eito = Pit ⋅ (ΔTt − ΔTitp )
(14)
where ΔTt is the total number of hours in period t. The Power form also includes a
check box: Peak Generation Only, which when checked signifies that all discharges from
the reservoir are assumed to occur only during the on-peak hours of generation. In effect,
discharge rate during the on-peak hours only is now:
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