 MAN B&W Diesel, Wärtsilä and other companies produce engines suitable for power generation that can be fueled with pure plant oils.In Europe, straight vegetable oil (SVO) costs 150 pence/litre at most supermarkets  and somewhat less when bought in bulk direct from the manufacturers whereas diesel costs at least 130 pence per litre (in the UK ) to well over that (depends on the year, 1.4 euro is the current market price in central Europe).In the USA, diesel costs about 0,6 $ per liter and the cheapest SVO costs about the same, with more expensive oils costing more than that (up to $7 per gallon).