fuel oil (called also heavy oil) operated engine.can be a dual fuel engine e.g. diesel / fuel oilor engine only or a generator set.generator 150~250 Kvaor engine only 200~300 HPused in working condition
Vegatable oil can be used to operate a diesal engine like the one in Willie's bus. But a jet engine like those in aricraft requires a fuel with a much higher octane rating and vegatable oil won't do.
Fuel oil is diesel. You can try a google on used machinery suppliers, they should give you some idea. Depending on where you are you will find someone who can help. Failing that if you already have a gen set, adapt a scania or volvo engine to drive it. Both these engines come in the horsepower range you are asking for and will give many years faithful service providing you look after them. All you need is to securely mount the chosen engine on a 3 channel frame, preferably on manufacturers engine mounts, with a adaptor plate (easily produced by anyone with half an idea) to drive the gen motor. Make sure you have warning lights (pref buzzer) in place for oil press, temp etc and you're in business.