The DOE, in its draft RPS rules, listed nine renewable energy technologies from which mandated participants can choose from: biomass, waste-to-energy, wind, solar, run-of-river hydropower, impounding hydropower, ocean energy, hybrid systems, and geothermal. The department qualified that it may later identify other technologies for inclusion upon the recommendation of the National Renewable Energy Board (NREB). Aside from distribution utilities and retail electricity suppliers, the DoE also included among the “mandated participants” other entities, namely: suppliers of last resort or those serving customers whose chosen suppliers ceased to deliver; generating companies, but up to the extent of their actual supply to their directly connected customers; distributors within economic zones; and other entities as recommended by NREB.  Read more here.