Waste-to-Energy Equipment worked example

Maintenance Downtime Cost at 57% generating capacity affected: a worked example

This scenario runs the maintenance downtime cost calculation on the strong side: 57% generating capacity affected, with every other input held at its documented default. Use it when scheduling a furnace or grate outage to balance lost generation and tipping revenue against the fixed cost of the maintenance turnaround.

The inputs for this scenario

  • Forced Outage Hours: 120 hours (unchanged)
  • Lost Generation Value Rate: 1,900 $/hr (unchanged)
  • Generating Capacity Affected: 57 % (raised for this scenario; the documented default is 50)
  • Turnaround Labor & Parts: 140,000 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total = outage hours x lost generation rate x (capacity affected รท 100) + turnaround cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 269,960 $ for total maintenance downtime cost, the number this scenario is built around.
  • At this operating point the engine returns 2,250 $ / piece for maintenance downtime cost per unit.
  • At this operating point the engine returns 129,960 $ for variable maintenance downtime cost.
  • At this operating point the engine returns 140,000 $ for fixed maintenance downtime cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where generating capacity affected sits at 50% and the headline result is 254,000 $, this scenario comes in 6.28% above the baseline at 269,960 $.
  • Use it when evaluating a planned versus forced outage, building a maintenance business case, or quantifying the cost of a specific historical trip. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Total maintenance downtime cost: 269,960 $ (headline result)
  • Maintenance downtime cost per unit: 2,250 $ / piece
  • Variable maintenance downtime cost: 129,960 $
  • Fixed maintenance downtime cost adder: 140,000 $

Run it with your numbers

  • Every input above is editable in the live Maintenance Downtime Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.