International Renewable Energy Alliance (REN Alliance) is a formal partnership entered into on 4 June 2004 by four non-profit international organisations (IHA, IGA, ISES, and WWEA) that represent the hydro, geothermal, solar, and wind power/energy sectors respectively. The World Bioenergy Association, (WBA), representing the bioenergy sector joined the partnership in June 2009. The alliance provides a unified cross-sectoral voice on renewable energy in international and regional energy fora and media.