Description
Calculate fuel cost per useful energy under a supplied efficiency.
Energy prices and charges depend on energy units, demand units, standing-charge days, tariff periods and settlement sign conventions. Purchased-energy losses differ from delivered-energy fractions, and signed prices can produce negative monetary terms. Nominal battery cost allocations are supplied scenarios rather than physical aging forecasts.
Calculate fuel cost per useful energy under a supplied efficiency.
When to use this tool
Use Fuel Useful Energy Cost when you already have fuelCostPerUnit, energyPerFuelUnit, efficiencyFraction and need to calculate fuel cost per useful energy under a supplied efficiency.
How to use the tool and how it works
- Enter fuelCostPerUnit, energyPerFuelUnit, efficiencyFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read costPerUsefulEnergyUnit. Use the output convention below.
Require fuelCostPerUnit>=0, energyPerFuelUnit>0 and efficiency in (0,1]; divide cost by energy*efficiency.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| fuelCostPerUnit | Fuel Cost Per Unit | Required. Finite number; minimum 0. |
| energyPerFuelUnit | Energy Per Fuel Unit | Required. Finite number; strictly above 0. |
| efficiencyFraction | Useful energy/input fuel energy in (0,1]; input energy must share the price denominator basis. | Required. Finite number; maximum 1; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| costPerUsefulEnergyUnit | Cost Per Useful Energy Unit | Required. Finite number. |
{
"input": {
"fuelCostPerUnit": 3,
"energyPerFuelUnit": 10,
"efficiencyFraction": 0.75
},
"output": {
"costPerUsefulEnergyUnit": 0.4
}
}Limitations and assumptions
- Fuel and energy bases must match. No heating-value basis, measured efficiency, operating cost, useful output or best fuel is selected.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Reconcile the actual meter series, tariff, contract and billing definitions for an account or market question. Use a complete cash-flow or physical-energy model when needed; a single block overlap, index ratio or supplied settlement term cannot establish actual charges or performance.
References
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