Waste Vegetable Oil

As of 2000, the United States was producing in excess of 11 billion liters of waste vegetable oil annually, mainly from industrial deep fryers in potato processing plants, snack food factories and fast food restaurants. If all those 11 billion liters could be collected and used to replace the energetically equivalent amount of petroleum (an ideal case), almost 1% of US oil consumption could be offset. However, use of waste vegetable oil as a fuel competes with some already established uses.

As of 2000, the United States were producing in excess of 11 billion liters of waste vegetable oil annually, mainly from industrial deep fryers in potato processing plants, snack food factories and fast food restaurants.

Waste vegetable oil, sold as the commodity yellow grease has a market value of approximately $1.09 per US gallon ($0.29/l or $335 per metric tonne), expected to rise to $1.21 by 2013, enough to make collection economically viable.
Currently, the largest uses of waste vegetable oil in the U.S. are for animal feed, pet food, and cosmetics. Since 2002, an increasing number of European Union countries have prohibited the inclusion of waste vegetable oil from catering in animal feed. Waste cooking oils from food manufacturing, however, as well as fresh or unused cooking oil, continues to be used in animal feed.
More recently, waste oil has become known for its ability to be refined into Bio Diesel fuel.