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How to Calculate the Cost of Running a Tri-Fuel Generator?

April 5, 2026

Quick Answer

To calculate the cost of running a tri-fuel generator, you need to know the fuel consumption rate, cost of each fuel type, and the generator's electricity output. Multiply the fuel consumption rate by the cost of each fuel to find the total cost per unit of electricity produced.

Calculating Fuel Consumption Rate

Calculating the fuel consumption rate of your tri-fuel generator is essential to determine the cost of operation. This rate typically varies depending on the fuel type, generator power output, and efficiency. For example, a 10 kW propane generator may consume 0.35 gallons of propane per hour of operation. To find the cost per hour, multiply the fuel consumption rate by the cost of propane per gallon: 0.35 gallons/hour x $2.50/gallon = $0.875/hour.

Determining Fuel Costs per Unit of Electricity

Once you have the fuel consumption rate and cost per unit of fuel, you can calculate the cost per unit of electricity produced. To do this, divide the cost per hour by the generator’s power output in kilowatts. For the above example, the cost per kilowatt-hour (kWh) is $0.875/hour ÷ 10 kW = $0.0875/kWh. This calculation helps you understand the cost of running the generator in terms of electricity produced.

Accounting for Fuel Type Switching and Efficiency

Tri-fuel generators often offer flexibility in fuel types, such as switching between propane, gasoline, and natural gas. When calculating costs, consider the efficiency and cost differences between each fuel type. For example, a generator may be 20% less efficient when running on propane compared to natural gas. Adjust the fuel consumption rate and cost accordingly to get an accurate picture of the total cost of operation. This will help you optimize fuel usage and reduce costs.

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