ClueLuma

Ratchet billing demand calculator

Use the larger of current demand and the historical-peak floor defined by the tariff.

Dbill=max⁡(Dcurrent, r×Dhistory)D_{\text{bill}} = \max\left(D_{\text{current}},\ r \times D_{\text{history}}\right)

Calculator

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

kW
ratio
kW
kW

Worked example

Given

  • DcurrentD_{\text{current}} = 320 kW
  • rr = 0.7 ratio
  • DhistoryD_{\text{history}} = 600 kW
Dbill=max⁡(320, 0.7×600)=420D_{\text{bill}} = \max\left(320,\ 0.7 \times 600\right) = 420

Symbols and units

SymbolMeaningUnit
DbillD_{\text{bill}}billed demandkW
DcurrentD_{\text{current}}current qualifying demandkW
rrtariff ratchet fractionratio
DhistoryD_{\text{history}}qualifying historical maximumkW

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.