"Renewable energy" refers to energy that is produced from sources like the sun and wind that are naturally replenished and do not run out.[1] In this portal we have chosen to discuss eight sources of renewable energy, identified in the drop-down menu above. When introducing a form of renewable energy, the baseline technology and the technology gaps are briefly discussed. When possible, a technology development roadmap is provided in order to highlight the technology needs that must be addressed to make that alternative economical and/or efficient. Key information on legislation and other initiatives aimed at accelerating the development of these technologies are also introduced, and potential end uses of the technology discussed. A description of sample projects is also included, highlighting potential advantages and disadvantages. This site is intended to serve as an introduction, and interested parties are referred to the news feed, and the report section of the portal for more in-depth information.