Chennai, June 14 (ANI): A three-day exhibition on renewable energy sources, 'Renergy 2014' was held in Chennai city of Tamil Nadu, starting Thursday. Hundreds of Indian and international companies set up stalls to exhibit products and participated in conferences and seminars that covered larger use of renewable energy sources. They discussed the use of solar energy, wind energy, waste to energy, biomass and energy efficiency in India. The aim of the exhibition was to give private companies a common platform where ideas on sustainable power generation could be exchanged. Companies showcased latest products and gave live demonstrations highlighting concepts and prevailing trends in renewable energy.