Energy worked example

Power Cost with machine power of 9 kW: a worked example

Suppose machine power falls to 9 kW. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate electricity usage and operating cost per run, shift, or part.

The inputs for this scenario

  • Machine power: 9 kW (the input this scenario stresses; the baseline uses 18)
  • Run time: 8 hr (held at the documented default)
  • Electricity rate: 0.12 $ / kWh (held at the documented default)
  • Demand charge / other fees: 10 $ (held at the documented default)
  • Units produced: 850 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: kWh = kW × run hours.
  • Power cost works out to 18.64 $ / run at these inputs, and this is the headline figure for the scenario.
  • Energy used works out to 72 kWh at these inputs.
  • Cost per part works out to 0.02 $ / part at these inputs.
  • Average hourly cost works out to 2.33 $ / hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where machine power sits at 18 kW and the headline result is 27.28 $ / run, this scenario comes in 31.67% below the baseline at 18.64 $ / run.
  • It computes total energy used in kWh, the run energy cost including fixed fees, and the resulting cost per part. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Power cost: 18.64 $ / run (headline result)
  • Energy used: 72 kWh
  • Cost per part: 0.02 $ / part
  • Average hourly cost: 2.33 $ / hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Power Cost calculator, set machine power to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.