Natural Gas - Not all homes in our part of New Jersey have access to natural gas, however more and more neighborhoods are getting access each year. Natual gas is not only the most efficient, it's delivered via a pipeline, eliminating the need for a diesel or proprane tank on your property.

Propane Tanks - Most standby generators are powered with propane. They run quietly and are less costly than most natural gas models to install. They are, however, less efficient and cost effective to run and do require a large, unsightly tank. While they do require filling from time to time, if you rarely lose power, propane has a long shelf life and your fuel is not likely to spoil before you need to use it. 

Diesel - Diesel is a safe option as they run on compression heating rather than spark ignition. They are more stable in this way than both gasoline and natural gas powered generators. Without spark plugs, they're actualy easier to maintain and the fuel carries more energy than the other options. 

Gasoline - Gasoline is not recommended for a standby generator. While they are a good choice for portable generators, they're not a great option for a permanantly installed generator. There's often a shortage of gasoline during major power outtage events and it's a less stable option. Also, refilling with gasoline requires the generator to be off and cooled down for a while prior to filling to avoid fire or explosion.