Yep, they use used frying and cooking oils to make bio-diesel. I doubt however that you will be able to get very much for it as it is too much animal fat. The preferred grease/oil is vegetable oil from fryers, however you can check with your local tallow and they will buy it. Some places will require a minimum amount to come and get it but you can always take it to them and sell it, I would call first and get their price per pound to see if it would even be worthwhile.