I have been interested in strait vegetable oil (SVO) fuel recently. I imagine that the DR has a lot of wast vegetable oil. Hear is a site that describes a range of biofuels. SVO is only one.
http://journeytoforever.org/biodiesel_make.html
It also strikes me that collecting wast oil and filtering it or making biodiesel would be a good micro business for the impoverished communities.
Bruce