Renewable energy is the fastest growing source of energy in the world. The continuing development of renewable energy technologies over the past few decades has led to significant improvements in conversion efficiencies and decreases in equipment costs. As the development of renewable energy increases across the world, experience with these technologies will likely lead to further improvement and innovation.

A wide variety of technologies provide energy from the different renewable resources. Resources such as biomass, wind, solar, hydro, and geothermal each have unique technologies which convert the energy of the resource in to a usable form. Many of these resources have several associated energy conversion technologies – biomass, for example, has a number of conversion processes to accommodate the great variety of the resource. Conversely, wind power utilizes the same general conversion principle for any wind resource.

The following are renewable energy technologies currently developed for commercial power generation: