Generator Emergency Fuel Requirement Planner
Estimate the fuel inventory needed to operate a generator through a defined emergency outage, then add an explicit reserve or contingency allowance.
Calculate emergency fuel requirement
Emergency fuel requirement
How emergency fuel storage is estimated
The basic fuel need is the average consumption rate multiplied by the outage duration. A reserve percentage is then applied to create an explicit contingency allowance. Finally, fuel already available and the entered handling allowance are considered.
Base fuel = Outage hours × Average fuel consumption
Required fuel = Base fuel × (1 + Reserve %)
The additional fuel-to-source figure is the required fuel plus the entered allowance minus fuel already available, with negative results treated as zero.
Why the consumption assumption matters
Generator fuel use changes with load. A single average rate is useful for planning, but the strongest emergency plan should use a representative load profile or measured fuel history for the actual generator.
Storage capacity is a separate constraint
Having enough theoretical fuel demand does not mean the site can store it all at once. The capacity check highlights when the calculated requirement exceeds the storage figure entered.
Limitations
- No load-dependent fuel curve is modeled.
- Fuel transfer, evaporation and unusable tank volume are represented only by your inputs.
- Reserve is a planning assumption, not a universal emergency requirement.
- Applicable storage, environmental and safety requirements must be checked separately.
FAQs
Can the outage duration be zero?
Yes mathematically, producing no base outage fuel requirement.
Why add a reserve?
It creates a deliberate buffer against uncertainty in runtime and actual fuel consumption.
What if available fuel already exceeds the requirement?
The additional fuel-to-source result becomes zero.
Can the required quantity exceed tank capacity?
Yes. The tool flags that condition so storage planning can be reviewed.