Industrial Generator Fuel Source Comparison
When designing a standby power system for any application we not only need to specify the right generator for the load requirements, but also consider the fuel source. Ultimately, it is the authority having jurisdiction (AHJ) that determines fuel reliability in any application. By understanding the pros and cons of the three major fuel sources considered in industrial applications, we can work with the AHJ to select the right standby power system for the application.
Diesel Fuel Generators
Pros:
- High Thermal Efficiency results in low cost per kilowatt
- Available where gaseous infrastructure is not in place
- Least flammable fuel source
- Long engine life
- Long-term cost of operation lower than gaseous gensets
Cons:
- Contamination and breakdown of storage systems can impact system reliability
- Fuel degrades over time, loosing efficacy
- Storage tanks take up space and may be considered unattractive
- Higher engine noise compared to gaseous engines
- Fuel may be unavailable for re-fueling in a weather emergency
Gaseous Fuel Generators (Natural Gas)
Pros:
- Don’t have to deal with fuel storage issues/refueling
- Infrastructure is available in most areas
- Highly reliable
- Quieter engine than diesel
- Have a lower carbon footprint
Cons:
- Local utilities have control
- Subject to shut-off during seismic activity or other natural disasters
- More expensive to operate than diesel
- Lower load response times
- Shorter engine life
Bi-fuel Generators (Diesel and Natural Gas)
Pros:
- Reduced diesel fuel storage/smaller tanks are needed to store fuel on site
- Improved reliability because of access to two fuel sources
- Lower maintenance costs
- Flexible design options
- Lower emissions
Cons:
- Higher costs than diesel systems
- Still need to store fuel on site
- If natural gas supply is disrupted for a long time, diesel fuel will need resupply