The Washington State Department of Transportation (WSDOT) Ferries Division will begin operating its third vessel – Klahowya – with a biodiesel fuel blend on Saturday, July 19. The Klahowya will operate on a five percent blend (B5) of tallow-based biodiesel and ultra-low sulfur diesel (95 percent). Tallow-based biodiesel is made from unused beef fat left over from the rendering process. The process of converting tallow into biodiesel is similar to the process used to convert plant oils such as soy and canola into biodiesel. The Klahowya fueling is part of the Biodiesel Research and Demonstration Project – a scientific pilot test of biodiesel in the marine environment.