How do you calculate cure oven energy cost per part?

Multiply connected load by runtime and energy price to get batch cost, then divide by good parts. At 95 kW, 7.5 hr, $0.14/kWh, the batch energy is about $99.75; the calculator reports a total of $24.9975 per the configured cost split.

How does batch loading change the cost per part?

Energy cost is mostly fixed per cycle, so spreading it over more good parts lowers the per-part figure. Doubling good parts in the same cure roughly halves the energy contribution to each part's cost.

Should I use connected load or average load?

For accuracy, use the average effective kW over the cycle. Connected load assumes full draw the whole time, but ramps and soaks pull less, so connected load gives a conservative upper bound.

What energy price should I enter?

Use your blended delivered rate including demand charges if you can, not just the headline per-kWh figure. The $0.14/kWh default is a typical US industrial rate, but yours may differ by region and tariff.

Why divide by good parts and not total parts?

Because scrapped parts still consumed energy but generate no value. Dividing by good parts loads the cost of cure energy onto the parts you can actually sell, which is the honest costing basis.

Does this include the oven's idle or preheat energy?

Only if you include that time in the runtime or roll it into an average kW. A standalone preheat before loading is energy you may want to add separately so it is not lost from the per-part cost.

Composites, Fiberglass & Advanced Materials calculator

Cure Oven Energy Cost Calculator

Cure Oven Energy Cost converts the kilowatts, hours, and energy price of a cure cycle into a clean dollars-per-part number for composites and adhesive-bonded work. It is the figure cost estimators and process engineers use to understand the true energy burden of long autoclave and oven cycles, and to see how batch loading drives unit cost. Cure cycles can run many hours at high connected load, so energy is a real line item — and because the cost is shared across whatever good parts come out, underloading the oven quietly inflates every part's cost. This calculator makes the loading trade-off visible.

What this calculator does

Estimate energy cost per composite part for oven, hot box, or heated tool curing.
estimating cure energy cost for composite production
It computes total batch energy cost from connected load, runtime, and energy price, then divides by good parts to give energy cost per part.

Formula used

Batch energy cost = oven or heated tool connected load × cure cycle runtime × electric or gas energy price
Cure Oven Energy Cost = batch energy cost ÷ good parts processed in the cure batch

Inputs explained

Oven or heated tool connected load:
Cure cycle runtime:
Energy price:
Good parts processed in the cure batch:

How to use the result

Use it when quoting parts, evaluating whether to consolidate cure batches, or comparing the energy cost of different cure profiles or oven assets.
It assumes the oven draws its full connected load for the entire runtime; real cycles ramp, soak, and idle, so steady-state load typically overstates true draw unless you use an average effective kW.

Current U.S. benchmarks

As of Apr 2026, industrial electricity averages 8.7 cents per kWh across the U.S. (EIA), up 5.5% from a year earlier. State averages range widely, so plants should confirm against their own tariff.
The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% from a year earlier. Quotes priced off last quarter's material cost miss this move.
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 cure oven energy cost per part? Multiply connected load by runtime and energy price to get batch cost, then divide by good parts. At 95 kW, 7.5 hr, $0.14/kWh, the batch energy is about $99.75; the calculator reports a total of $24.9975 per the configured cost split.
How does batch loading change the cost per part? Energy cost is mostly fixed per cycle, so spreading it over more good parts lowers the per-part figure. Doubling good parts in the same cure roughly halves the energy contribution to each part's cost.
Should I use connected load or average load? For accuracy, use the average effective kW over the cycle. Connected load assumes full draw the whole time, but ramps and soaks pull less, so connected load gives a conservative upper bound.
What energy price should I enter? Use your blended delivered rate including demand charges if you can, not just the headline per-kWh figure. The $0.14/kWh default is a typical US industrial rate, but yours may differ by region and tariff.
Why divide by good parts and not total parts? Because scrapped parts still consumed energy but generate no value. Dividing by good parts loads the cost of cure energy onto the parts you can actually sell, which is the honest costing basis.

Last reviewed 2026-05-12.