Cleanroom & Contamination Control worked example

Cleanroom Energy Cost at 59% share of energy allocated to this room or program: a worked example

This worked example runs the cleanroom energy cost numbers for a tougher week than the baseline: 59% share of energy allocated to this room or program instead of the typical 82%. Estimate cleanroom energy cost using HVAC and fan energy use, utility rate, operating share, and fixed demand or service charges.

The inputs for this scenario

  • Cleanroom HVAC and fan energy use: 125,000 kWh (held at the documented default)
  • Electricity rate for cleanroom service: 0.14 $ / kWh (held at the documented default)
  • Share of energy allocated to this room or program: 59 % (the input this scenario stresses; the baseline uses 82)
  • Fixed demand, metering, or service charge: 2,400 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable cleanroom energy cost = cleanroom HVAC and fan energy use × electricity cost for cleanroom service × energy assigned to this room, suite, or production program.
  • Total cleanroom energy cost works out to 12,725 total cleanroom energy cost at these inputs, and this is the headline figure for the scenario.
  • Energy cost per kwh works out to 0.1 $ / piece at these inputs.
  • Variable cleanroom energy cost works out to 10,325 $ at these inputs.
  • Fixed demand, metering, or utility service charge works out to 2,400 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where share of energy allocated to this room or program sits at 82% and the headline result is 16,750 total cleanroom energy cost, this scenario comes in 24.03% below the baseline at 12,725 total cleanroom energy cost.
  • Use it monthly or per billing period to allocate cleanroom utility spend to a specific room, suite, or production program for budgeting and cost-of-quality reporting. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total cleanroom energy cost: 12,725 total cleanroom energy cost (headline result)
  • Energy cost per kwh: 0.1 $ / piece
  • Variable cleanroom energy cost: 10,325 $
  • Fixed demand, metering, or utility service charge: 2,400 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Cleanroom Energy Cost calculator, set share of energy allocated to this room or program to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.