There are a number of fuels that can be used in various generators. Some of them are fairly clean and sustainable, some are extremely dirty and harmful to the environment. Using fuel-powered generators should only ever play an emergency-backup role in your system. If you use the generator more than once or twice a week, it is likely that your renewable generation is not sufficient to meet your needs. We will not provide services to customers who wish to generate power from waste engine oil, as we consider this to be an environmental crime.