The Centre for Renewable Energy Sources and Saving (CRES) is the Greek national entity for the promotion of renewable energy sources, rational use of energy and energy conservation. In the modern demanding energy sector CRES is dynamically active, in the frame of the national and Community policy and legislation, for the protection of the environment and sustainable development. Working in the state of the art of technology development, CRES implements innovative projects and significant activities for the promotion and market penetration of new energy technologies.