ClueLuma

Motor annual electric cost or savings calculator

Combines energy and billed-demand charges for annual motor cost.

Celectric=kW×H×re+kWbilled×rd×MC_{\text{electric}} = \mathrm{kW} \times H \times r_{e} + \mathrm{kW}_{\text{billed}} \times r_{d} \times M

Calculator

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

kW
$/kWh
$/kW-month
kW
h/yr
month/yr
$/yr

Worked example

Given

  • kWbilled\mathrm{kW}_{\text{billed}} = 30 kW
  • rer_{e} = 0.1 $/kWh
  • rdr_{d} = 12 $/kW-month
  • kW\mathrm{kW} = 30 kW
  • HH = 6,000 h/yr
  • MM = 12 month/yr
Celectric=30×6000×0.1+30×12×12=22,320C_{\text{electric}} = 30 \times 6000 \times 0.1 + 30 \times 12 \times 12 = 22{,}320

Symbols and units

SymbolMeaningUnit
CelectricC_{\text{electric}}annual electricity cost; use reductions for savings$/yr
kWbilled\mathrm{kW}_{\text{billed}}billed demandkW
rer_{e}energy rate$/kWh
rdr_{d}monthly demand rate$/kW-month
kW\mathrm{kW}real motor inputkW
HHannual operating hoursh/yr
MMcharged monthsmonth/yr

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