How do you calculate maintenance downtime cost?

Multiply outage hours by the lost generation rate and by the fraction of capacity affected, then add turnaround labor and parts. With 120 hours, $1,900/hr, 50% affected, and $140,000 turnaround, the total is $254,000.

Why include capacity affected as a percentage?

Many WTE outages are partial derates, not full trips. At 50% capacity affected the lost-generation portion is $114,000 rather than the $228,000 a full outage would cost over the same 120 hours.

What is the cost per hour of downtime?

Divide the total by outage hours. Here $254,000 over 120 hours is about $2,117 per hour, which blends the ongoing lost generation with the one-time turnaround spend.

Planned outage vs forced outage, which is cheaper?

Planned outages usually have lower turnaround labor and parts and can be scheduled into low-price or low-tipping periods, cutting the lost generation rate. Forced outages carry premium labor and worse timing, raising every term in this formula.

What is a good downtime cost benchmark?

There is no universal number, but tracking cost per outage hour over time and against the $2,117/hr in this example helps flag when a unit is drifting toward run-to-failure territory.

Does this include lost gate fees?

No. This model covers lost generation plus turnaround. If the outage also stops waste intake, add lost gate-fee revenue and any diversion costs separately for the full picture.

Waste-to-Energy Equipment calculator

Maintenance Downtime Cost Calculator

Maintenance Downtime Cost captures the full financial hit of a waste-to-energy outage: the revenue lost while the unit is offline plus the labor and parts to bring it back. Plant managers and reliability engineers use it to rank maintenance decisions, justify condition monitoring, and decide between a run-to-failure and a planned-outage strategy. Because a WTE unit earns from both power sales and gate fees, every offline hour compounds, and a partial derate still costs real money. This calculator makes the true cost of an outage explicit so it can be weighed against the price of preventing it.

What this calculator does

Estimates the cost of a waste-to-energy maintenance outage from offline hours, lost generation rate, capacity affected, and fixed turnaround labor and parts.
Use it when scheduling a furnace or grate outage to balance lost generation and tipping revenue against the fixed cost of the maintenance turnaround.
It totals lost generation value (outage hours times rate times the fraction of capacity affected) and adds the fixed turnaround labor and parts cost.

Formula used

Total = outage hours x lost generation rate x (capacity affected ÷ 100) + turnaround cost
Per hour = total cost ÷ outage hours

Inputs explained

Forced Outage Hours:
Lost Generation Value Rate:
Generating Capacity Affected:
Turnaround Labor & Parts:

How to use the result

Use it when evaluating a planned versus forced outage, building a maintenance business case, or quantifying the cost of a specific historical trip.
It does not include gate-fee revenue lost when waste cannot be received, contractual availability penalties, or restart fuel, so it can understate the total business impact of a full unit trip.

Current U.S. benchmarks

Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate maintenance downtime cost? Multiply outage hours by the lost generation rate and by the fraction of capacity affected, then add turnaround labor and parts. With 120 hours, $1,900/hr, 50% affected, and $140,000 turnaround, the total is $254,000.
Why include capacity affected as a percentage? Many WTE outages are partial derates, not full trips. At 50% capacity affected the lost-generation portion is $114,000 rather than the $228,000 a full outage would cost over the same 120 hours.
What is the cost per hour of downtime? Divide the total by outage hours. Here $254,000 over 120 hours is about $2,117 per hour, which blends the ongoing lost generation with the one-time turnaround spend.
Planned outage vs forced outage, which is cheaper? Planned outages usually have lower turnaround labor and parts and can be scheduled into low-price or low-tipping periods, cutting the lost generation rate. Forced outages carry premium labor and worse timing, raising every term in this formula.
What is a good downtime cost benchmark? There is no universal number, but tracking cost per outage hour over time and against the $2,117/hr in this example helps flag when a unit is drifting toward run-to-failure territory.

Last reviewed 2026-05-12.