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Other renewable energy technologies are still under development, and include cellulosic ethanol, hot-dry-rock geothermal power, and marine energy. These technologies are not yet widely demonstrated or have limited commercialization. Many are on the horizon and may have potential comparable to other renewable energy technologies, but still depend on attracting sufficient attention and research, development and demonstration (RD&D) funding. There are numerous organizations within the academic, federal, and commercial sectors conducting large scale advanced research in the field of renewable energy. This research spans several areas of focus across the renewable energy spectrum. Most of the research is targeted at improving efficiency and increasing overall energy yields. Multiple federally supported research organizations have focused on renewable energy in recent years. Two of the most prominent of these labs are Sandia National Laboratories and the National Renewable Energy Laborat...

This section needs to be updated . Please update this article to reflect recent events or newly available information. ( March 2019 ) Renewable electricity production, from sources such as wind power and solar power, is variable which results in reduced capacity factor and require either energy storage of capacity equal to its total output, or base load power sources from non intermittent sources like hydropower, fossil fuels or nuclear power. Since renewable energy sources power density per land area is at best three orders of magnitude smaller than fossil or nuclear power, renewable power plants tends to occupy thousands of hectares causing environmental concerns and opposition from local residents, especially in densely populated countries. Solar power plants are competing with arable land and nature reserves, while on-shore wind farms face opposition due to aesthetic concerns and noise, which is impacting both humans and wildlife. In the United States, the Massachusetts Cape Wind...

This section needs expansion . You can help by adding to it. ( March 2019 ) From around 2010 onwards, there was increasing discussion about the geopolitical impact of the growing use of renewable energy. It was argued that former fossil fuels exporters would experience a weakening of their position in international affairs, while countries with abundant renewable energy resources would be strengthened. Also countries rich in critical materials for renewable energy technologies were expected to rise in importance in international affairs. The GeGaLo index of geopolitical gains and losses assesses how the geopolitical position of 156 countries may change if the world fully transitions to renewable energy resources. Former fossil fuels exporters are expected to lose power, while the positions of former fossil fuel importers and countries rich in renewable energy resources is expected to strengthen.

This section needs expansion . You can help by adding to it. ( March 2019 ) The ability of biomass and biofuels to contribute to a reduction in CO 2 emissions is limited because both biomass and biofuels emit large amounts of air pollution when burned and in some cases compete with food supply. Furthermore, biomass and biofuels consume large amounts of water. Other renewable sources such as wind power, photovoltaics, and hydroelectricity have the advantage of being able to conserve water, lower pollution and reduce CO 2 emissions. The installations used to produce wind, solar and hydro power are an increasing threat to key conservation areas, with facilities built in areas set aside for nature conservation and other environmentally sensitive areas. They are often much larger than fossil fuel power plants, needing areas of land up to 10 times greater than coal or gas to produce equivalent energy amounts. More than 2000 renewable energy facilities are built, and more are under constr...

Burbo, NW-England Sunrise at the Fenton Wind Farm in Minnesota, US The CSP-station Andasol in Andalusia, Spain Ivanpah solar plant in the Mojave Desert, California, United States Three Gorges Dam and Gezhouba Dam, China Shop selling PV panels in Ouagadougou, Burkina Faso Stump harvesting increases recovery of biomass from forests A small, roof-top mounted PV system in Bonn, Germany The community-owned Westmill Solar Park in South East England Komekurayama photovoltaic power station in Kofu, Japan Krafla, a geothermal power station in Iceland