Our 24 kW generator is built by a local company (Wrico) which builds generators for large motor homes. It is diesel powered and is based on a 3 cylinder Kubota tractor motor. Went diesel since NG is about 16 miles west and we are otherwise all electric. And we always have quite a bit of stored diesel due to its use in the heavy equipment and our pickup. The generator is on a stand and below it is an aluminum 70 gallon fuel tank. It can run most of the house (one of two electrical panels) and has been very useful in the last three winters. We've had 5 or 6 day outages every winter. Also with the greater incidences of large forest fires, the electric utilities have plans to shut off power during red flag events (as they have been doing in California). We want to keep our 4 freezers frozen.