This is a list of notable renewable energy organizations:

Associations

Bioenergy

• World Bioenergy Association
• Biomass Thermal Energy Council (BTEC)
• Pellet Fuels Institute

Geothermal energy

• Geothermal Energy Association
• Geothermal Rising
• Global Geothermal Alliance

Hydropower

• International Hydropower Association (IHA) (International)
• National Hydropower Association (US)

Renewable energy

• Agency for Non-conventional Energy and Rural Technology (ANERT), Kerala, India
• American Council on Renewable Energy
• American Solar Energy Society
• Clean Energy States Alliance (CESA)
• EKOenergy
• Energy-Quest
• Environmental and Energy Study Institute
• EurObserv'ER
• European Renewable Energy Council
• Green Power Forum
• International Renewable Energy Agency (IRENA)
• International Renewable Energy Alliance (REN Alliance)
• Office of Energy Efficiency and Renewable Energy
• REN21
• Renewable and Appropriate Energy Laboratory
• Renewable Energy and Energy Efficiency Partnership (REEEP)
• RenewableUK
• Renewable Fuels Association
• Rocky Mountain Institute
• SustainableEnergy
• Trans-Mediterranean Renewable Energy Cooperation
• World Council for Renewable Energy
• The World Renewable Energy Association (WoREA)

Solar energy

• International Solar Alliance(ISA)
• International Solar Energy Society
• Solar Cookers International
• Solar Energy Industries Association (SEIA)
• Wadebridge Renewable Energy Network (WREN)

Wind energy

• American Wind Energy Association
• Citizen Partnerships for Offshore Wind (CPOW)
• Global Wind Energy Council
• WindEurope
• World Wind Energy Association

Educational and research institutions

Renewable energy

• Centre for Renewable Energy Systems Technology (CREST) at Loughborough University
• NaREC (UK National Renewable Energy Centre)
• National Renewable Energy Laboratory (NREL)
• RES - The School for Renewable Energy Science (University in Iceland and University in Akureyri)
• Norwegian Centre for Renewable Energy (SFFE) at NTNU, SINTEF.
• Centre for Alternative Technology (CAT)

Solar energy

• Clean Energy Institute (CEI) at the University of Washington
• Florida Solar Energy Center (FSEC)
• Plataforma Solar de Almería (PSA)