Peppers for sale at what locals are calling the White House Farmers Market, in Washington, D.C. Matt Sennewald/NPR hide caption

toggle caption Matt Sennewald/NPR

San Juan Bioenergy is converting sunflower waste — including hulls and other plant material — into fuel pellets that produce a portion of the power used by the extraction facility. Adam Burke for NPR hide caption

toggle caption Adam Burke for NPR

NPR thanks our sponsors

Become an NPR sponsor