ClueLuma

Future ratchet excess calculator

Price the demand floor above normal demand for each later month in which the ratchet remains active.

Extra future cost=n×max⁡(0, r×Dpeak−Dnormal)×Demand rate\text{Extra future cost} = n \times \max\left(0,\ r \times D_{\text{peak}} - D_{\text{normal}}\right) \times \text{Demand rate}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

month
ratio
kW
kW
$/kW/month
$

Worked example

Given

  • nn = 8 month
  • rr = 0.75 ratio
  • DpeakD_{\text{peak}} = 620 kW
  • DnormalD_{\text{normal}} = 390 kW
  • Demand rate\text{Demand rate} = 12 $/kW/month
Extra future cost=8×max⁡(0, 0.75×620−390)×12=7,200\text{Extra future cost} = 8 \times \max\left(0,\ 0.75 \times 620 - 390\right) \times 12 = 7{,}200

Symbols and units

SymbolMeaningUnit
Extra future cost\text{Extra future cost}ratchet-related later charges$
nnremaining affected billing monthsmonth
rrratchet fractionratio
DpeakD_{\text{peak}}historical peakkW
DnormalD_{\text{normal}}normal monthly demandkW
Demand rate\text{Demand rate}monthly unit demand charge$/kW/month

Related calculators

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.