Biodiesel is commercially available in most oilseed-producing states in the United States. As of 2005, it is more expensive than petroleum-diesel, though it is still commonly produced in relatively small quantities (in comparison to petroleum products and ethanol fuel). The total U.S. production capacity for biodiesel reached 2.24 billion US gallons per year (8.5×106 m3/a) in 2007, although poor market conditions held 2007 production to about 450 million US gallons (1.7×106 m3), according to the National Biodiesel Board (NBB).