How do you calculate energy cost per part?

Multiply average equipment demand (kW) by operating runtime (hr) to get kWh, multiply that by your blended electricity rate ($/kWh) to get total electricity cost, then divide by good units produced. With 150 kW over 8 hr at $0.12/kWh making 5,000 good units, that is $144 ÷ 5,000 = $0.0288 per part.

What is a good energy cost per part?

There is no universal benchmark because it scales with how energy-intensive the process is. A stamping or assembly cell may run fractions of a cent per part like the $0.0288 in the example, while melting, heat treat, or plastics drying can run dollars per part. Trend it against your own history and against the best line running the same part.

Should I use nameplate kW or measured demand?

Use measured average demand from a power meter or submeter whenever you can. Nameplate kW is the maximum rating and usually overstates real draw by 30 to 60 percent, which inflates your cost per part and leads to bad quotes.

Why divide by good units instead of total units?

Because the energy spent making scrap still hit your bill, but it produced nothing you can sell. Dividing by good units loads that wasted energy onto the parts you actually ship, which is the true cost and exposes how scrap quietly raises energy intensity.

Does this include demand charges or just energy?

This uses a blended $/kWh rate, so it captures the energy (kWh) portion. It does not separately model peak demand charges ($/kW), which can be a large part of an industrial bill. If demand charges are significant, fold them into the blended rate or model them separately.

How can I lower energy cost per part?

Cut idle time so the machine isn't drawing power between cycles, raise good-unit throughput to spread the same energy over more parts, shift work off peak-rate windows, and address the biggest demand drivers like heaters, hydraulics, and compressed air leaks first.

Energy & Sustainability calculator

Energy Cost per Part Calculator

Energy cost per part is the share of your electricity bill that each good unit carries, expressed in dollars per piece. Plant managers, cost engineers, and continuous-improvement teams use it to put a price on machine energy and to spot which lines or shifts are quietly draining the meter. It matters because electricity is often the third- or fourth-largest controllable cost behind material and labor, yet it rarely shows up on a routed cost sheet. Tracking $/part makes energy waste visible the same way scrap and downtime are, and it turns vague sustainability goals into a number you can act on.

What this calculator does

Calculate electricity cost per manufactured part from equipment kW, operating hours, blended utility rate, and units produced.
a plant team needs to assign electricity cost to a product, line, shift, batch, or work order
It computes the electricity cost carried by each good unit by multiplying equipment demand by runtime, costing that energy at your blended rate, and dividing by good output.

Formula used

Electricity used = average equipment demand × operating runtime
Total electricity cost = electricity used × blended electricity rate
Energy cost per part = total electricity cost ÷ good units produced

Inputs explained

Average equipment demand: Use metered average kW for the line, oven, chiller, compressor, or cell during the period.
Operating runtime: Use the hours the equipment actually ran for the same production period.
Blended electricity rate: Use the utility bill or finance rate including energy, riders, and demand allocation if applicable.
Good units produced: Use saleable units produced during the same runtime and energy boundary.

How to use the result

Use it when costing a part for a quote, comparing the energy intensity of two machines or routings, or building the energy line of a should-cost or activity-based cost model.
It assumes the machine draws a steady average demand for the whole runtime, so for equipment with heavy idle, ramp, or peak-demand charges you should use measured kWh from a submeter instead of nameplate 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.

Common questions

How do you calculate energy cost per part? Multiply average equipment demand (kW) by operating runtime (hr) to get kWh, multiply that by your blended electricity rate ($/kWh) to get total electricity cost, then divide by good units produced. With 150 kW over 8 hr at $0.12/kWh making 5,000 good units, that is $144 ÷ 5,000 = $0.0288 per part.
What is a good energy cost per part? There is no universal benchmark because it scales with how energy-intensive the process is. A stamping or assembly cell may run fractions of a cent per part like the $0.0288 in the example, while melting, heat treat, or plastics drying can run dollars per part. Trend it against your own history and against the best line running the same part.
Should I use nameplate kW or measured demand? Use measured average demand from a power meter or submeter whenever you can. Nameplate kW is the maximum rating and usually overstates real draw by 30 to 60 percent, which inflates your cost per part and leads to bad quotes.
Why divide by good units instead of total units? Because the energy spent making scrap still hit your bill, but it produced nothing you can sell. Dividing by good units loads that wasted energy onto the parts you actually ship, which is the true cost and exposes how scrap quietly raises energy intensity.
Does this include demand charges or just energy? This uses a blended $/kWh rate, so it captures the energy (kWh) portion. It does not separately model peak demand charges ($/kW), which can be a large part of an industrial bill. If demand charges are significant, fold them into the blended rate or model them separately.

Last reviewed 2026-05-12.