Diesel Generator Cost Per kWh Calculator
Estimate your diesel generator electricity production cost per kWh. Enter the current fuel price, consumption rate, and load factor to instantly calculate hourly running costs and daily operating expenses.
Diesel Generator Cost Per kWh Calculator
How to Use Diesel Generator Cost Per kWh Calculator
Calculating the electricity generation cost for off-grid operations helps optimize power generation budgets and evaluate efficiency. Follow these steps to perform the calculation:
- 1Enter diesel fuel price. Input the current cost of fuel per liter and select the appropriate currency from the dropdown.
- 2Enter generator fuel consumption in liters per hour. Input the fuel rate consumption in liters per hour as specified by the manufacturer or measured value.
- 3Enter rated generator power. Input the rated maximum capacity of the generator set in kilowatts.
- 4Enter load percentage. Input the percentage of the rated capacity that the generator is currently running under.
- 5Enter operating hours if required. Input the expected duration of generator operation in hours (optional step).
- 6Press Calculate. Click the Calculate Cost button to compute the results.
- 7Read electricity cost per kWh and operating cost. Review the outputs, including actual output power, hourly fuel cost, cost per kWh, and daily operating cost.
How to Calculate Diesel Generator Cost Per kWh
Determining the real cost of electricity generated by a diesel generator involves three main calculations: adjusting rated generator power for actual operating load, calculating hourly fuel expenses, and dividing the hourly cost by the energy produced. Follow these formulas to calculate generator operational costs:
Formula 1
Formula 2
Formula 3
Step-by-Step Worked Example
Here is a detailed engineering example demonstrating the cost calculation for a standard industrial generator setup:
Given Parameters:
- Generator Rating: 100 kW
- Load Factor: 80%
- Diesel Consumption: 20 L/h
- Diesel Price: $1.20/L
Step 1 — Calculate Actual Output Power
Actual Output Power = 100 kW × 80 ÷ 100 = 80 kW
Step 2 — Calculate Hourly Fuel Cost
Hourly Fuel Cost = 20 L/h × $1.20/L = $24/hour
Step 3 — Calculate Cost Per kWh
Cost Per kWh = $24/hour ÷ 80 kW = $0.30 per kWh
Final Answer Summary
The diesel generator electricity cost is $0.30 per kWh, while the hourly running fuel cost equates to $24.00 per hour.
Diesel Generator Cost Per kWh Chart
This reference table details the operating output, fuel consumption, and electricity generation cost per kWh for a 100 kW generator operating at different loads, with a diesel price benchmark of $1.20 per liter.
| Generator Load (%) | Power Output (kW) | Fuel Consumption (L/h) | Diesel Price ($/L) | Cost per Hour ($) | Cost per kWh ($) |
|---|---|---|---|---|---|
| 25% | 25 kW | 8 L/h | 1.20 | 9.60 | 0.384 |
| 50% | 50 kW | 13 L/h | 1.20 | 15.60 | 0.312 |
| 75% | 75 kW | 18 L/h | 1.20 | 21.60 | 0.288 |
| 100% | 100 kW | 24 L/h | 1.20 | 28.80 | 0.288 |
💡 Most diesel generators achieve their best fuel efficiency between 70% and 85% load.
Diesel Generator Cost Per kWh Frequently Asked Questions
The cost to generate one kilowatt-hour using a diesel generator typically falls between thirty and fifty cents. This estimate fluctuates heavily based on current diesel fuel prices, the specific fuel consumption rate of your generator model, and routine maintenance expenses over its lifespan.
Diesel generators are generally more fuel-efficient and have lower long-term operating costs than their gasoline counterparts. While the initial purchase price of a diesel unit is often higher, the reduced fuel consumption and longer engine lifespan make it cheaper to run over many years.
To calculate a generator's fuel consumption per hour, you must determine its specific burn rate at your current operational load. You can find this information in the manufacturer's specifications, which typically list gallons per hour used at quarter, half, and full electrical load capacities.
A modern diesel generator typically produces around three to four units of electricity, or kilowatt-hours, per liter of diesel fuel consumed. This efficiency metric depends significantly on the generator's design, age, overall operating condition, and the electrical load it is currently supplying.
The primary factors influencing the running cost of a diesel generator include the localized price of diesel fuel, the generator's specific fuel efficiency rating, the average operating load, and the frequency of preventative maintenance required to keep the engine running at peak performance.