Both natural gas and diesel engines and gen sets have proven performance and reliability. Diesel has a higher power density and can reach full load more quickly than natural gas; however, natural gas generators can meet the <:10 minimum start up time required for emergency power supply systems. Once started, reliability and performance of diesel, natural gas, and bi-fuel generators is equivalent. Diesel generators have a higher overall efficiency.
Generator maintenance programs shouldn’t be overlooked and it’s important to understand the extra human effort needed to keep a diesel generator operating at peak condition compared to a gaseous-fueled unit.
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