Once refined, yellow grease can and may be used for Bio-Diesel and many other products based on free market demand. If your current supplier is out of Denver or Boulder you are increasing the carbon footprint. Drivers must travel over 150 miles round trip to service your location. Simple solutions like working with a local supplier will help you save our planet. We are in your area every 2 weeks with our standard route. Support your local business and you will be saving the environment.