How do you calculate agitator energy cost per batch?

Multiply shaft load by runtime and electricity rate to get total cost, then divide by good batches. At 12 kW for 8 hr at $0.12/kWh over 20 batches, total energy is 96 kWh costing $11.52, or $0.576 per batch.

How much energy does an agitator use per shift?

Energy in kWh is shaft load times runtime. The example draws 12 kW for 8 hours, using 96 kWh — enough to noticeably move a plant's demand profile on a high-viscosity line.

What is a good agitator energy cost per batch?

It scales with viscosity and batch size, so trend it rather than chasing an absolute. The $0.576 per batch here is a baseline; a VFD that trims average shaft load 20% would cut it proportionally.

Does this use motor nameplate or actual shaft load?

Enter actual shaft load, not nameplate rating — a motor rarely runs at full nameplate. If you only have nameplate, derate it by your measured load factor and account for motor efficiency in the figure.

How can I reduce agitator power cost?

Fit a VFD to match speed to viscosity, avoid over-mixing past the blend endpoint, right-size the impeller, and shift runtime to off-peak rates. Each directly lowers the kWh or the rate in this calculation.

Agitator power vs total batch cost — how big a share?

On low-viscosity blends agitation is minor; on thick pastes or long-cycle reactions it can be a meaningful slice. Compute it here, then feed the per-batch figure into the batch cost calculator to see its real weight.

Mixing, Blending & Industrial Batch Processing calculator

Agitator Power Calculator

Agitator power cost captures what it actually costs in electricity to keep a mixer or blender turning over a shift, allocated down to each good batch. Plant engineers and energy managers on continuous batch lines use it to benchmark the energy intensity of mixing, justify variable-frequency drives, and load energy into per-batch cost models. Agitation is often a quietly large electrical load — high-viscosity blends can pull serious shaft power for hours — yet it rarely shows up on a batch cost sheet. This calculator makes that hidden cost explicit per batch.

What this calculator does

Estimate agitator energy cost per batch from connected motor load, runtime, electricity rate, and good batches produced.
Use it when agitator energy is a real chunk of conversion cost and you need to allocate kWh per batch before quoting or pricing a new recipe.
It computes total agitator energy cost from shaft load, runtime and electricity rate, then divides by good batches to give energy cost per batch.

Formula used

Agitator energy cost = motor shaft load × runtime × electricity rate
Energy cost per batch = agitator energy cost ÷ good batches produced

Inputs explained

Agitator motor shaft load:
Agitator runtime per shift:
Electricity rate:
Good batches produced:

How to use the result

Use it when building per-batch cost models, evaluating a VFD or motor upgrade, or benchmarking mixing energy intensity across recipes.
It uses motor shaft load as a flat figure; real draw varies with viscosity, fill level and ramp-up, and it ignores motor efficiency losses unless you build them into the load value.

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 agitator energy cost per batch? Multiply shaft load by runtime and electricity rate to get total cost, then divide by good batches. At 12 kW for 8 hr at $0.12/kWh over 20 batches, total energy is 96 kWh costing $11.52, or $0.576 per batch.
How much energy does an agitator use per shift? Energy in kWh is shaft load times runtime. The example draws 12 kW for 8 hours, using 96 kWh — enough to noticeably move a plant's demand profile on a high-viscosity line.
What is a good agitator energy cost per batch? It scales with viscosity and batch size, so trend it rather than chasing an absolute. The $0.576 per batch here is a baseline; a VFD that trims average shaft load 20% would cut it proportionally.
Does this use motor nameplate or actual shaft load? Enter actual shaft load, not nameplate rating — a motor rarely runs at full nameplate. If you only have nameplate, derate it by your measured load factor and account for motor efficiency in the figure.
How can I reduce agitator power cost? Fit a VFD to match speed to viscosity, avoid over-mixing past the blend endpoint, right-size the impeller, and shift runtime to off-peak rates. Each directly lowers the kWh or the rate in this calculation.

Last reviewed 2026-05-12.