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Dairy Herd Energy Cost Estimator

The Dairy Herd Energy Cost Estimator turns a per-cow daily electricity-use assumption into an estimated herd electricity bill for a selected period. It can represent the share of milking, milk cooling, ventilation, water heating, pumping, lighting, or other electrically powered activities that you choose to allocate on a per-cow basis.

This approach is most useful when you have measured farm electricity use, equipment estimates, or a budget assumption that can be expressed as kilowatt-hours per cow per day. By keeping the electricity rate separate, you can compare tariff scenarios without changing the physical energy assumption. The calculator does not attempt to infer electricity consumption from animal biology, and it excludes demand charges, fixed monthly fees, taxes, fuel use, and time-of-use pricing unless you incorporate those effects into the rate you enter.

Inputs

head
kWh/day
days
$/kWh
Result
—
Estimated electricity cost
Estimated electricity use—
Average electricity cost per day—
Electricity cost per cow over period—

1. Set the represented herd size
Enter the number of cows to which the energy-use assumption applies.

2. Enter electricity use per cow
Use a measured or budgeted kWh-per-cow-per-day figure for the electrical loads you intend to include.

3. Choose the operating period
Enter the number of days represented by the estimate.

4. Add the electricity price
Use a blended energy price in dollars per kWh if you want a simple cost estimate.

5. Review cost and consumption
Check total kWh as well as daily and per-cow cost to understand what is driving the result.

Total electricity = Cows × kWh per cow per day × Days Estimated cost = Total electricity × Electricity price per kWh

Where:

  • Cows = number of animals represented by the allocation.
  • kWh per cow per day = allocated electrical energy use per cow each day.
  • Days = operating days in the estimate.
  • Electricity price = variable energy price in dollars per kWh.

Assumptions: The result treats all kWh as if they were billed at one variable rate. Fixed service fees, demand charges, taxes, tiering, and time-of-use differences are not modeled separately.

What the result means

The main result is the variable electricity cost implied by the entered energy use and price; it is not a full utility-bill forecast.

For billing decisions, compare the estimate with your utility tariff and actual meter data.

Given: 210 cows, 3.8 kWh per cow per day, 31 days, and $0.14 per kWh.

Calculation:
Daily electricity = 210 × 3.8 = 798 kWh/day
Period electricity = 798 × 31 = 24,738 kWh
Estimated cost = 24,738 × $0.14 = $3,463.32

Result: $3,463.32 for the 31-day period.

The estimate represents energy charges for the included load allocation; the actual utility invoice may also contain other charges.

Where can I get a kWh-per-cow assumption?

You can derive it by dividing measured electricity for the included farm loads by the number of represented cows and days. Equipment run-time estimates can also be used when metered data are unavailable.

Should I use the total amount from my utility bill as the electricity rate?

Use a per-kWh rate that matches the cost scope you want to model. A simple bill-total divided by kWh can create a blended rate, but it may embed fixed and demand charges that do not scale directly with consumption.

Does this include diesel, propane, or natural gas?

No. The formula is specifically for electricity measured in kWh. Other energy sources should be costed separately.

Can I compare an efficiency upgrade with this estimator?

Yes. Run a baseline with the current kWh-per-cow assumption and another scenario with the expected lower value, keeping herd size, days, and rate consistent.

Why might the estimate differ from my actual electricity bill?

Actual bills can include demand charges, fixed fees, time-of-use pricing, taxes, seasonal rates, and loads not allocated to the dairy herd. Those elements are outside this simple model.