SALEM, Ore. (AP) -- Singer Willie Nelson plans to speak in Salem at the opening of the expansion of a local biodiesel plant. Nelson is a longtime advocate of the alternative fuel.

The capacity of the plant, SeQuential Biofuels, has increased to 6 million gallons a year. Nelson also was there for the groundbreaking last year. He is to perform Friday night at the Oregon State Fair.

SeQuential was the first such plant in the state when it opened in 2005. The expansion was helped by a $6 million state loan.