In the same period, Enel focused on the following issues: finalization of low-cost techniques to reduce NOx emissions at the key turbo gas power plants which guar antee grid stability; development of a tool to monitor and control thermal gas- and coal-fuelled power plants that can optimize operations in a flexible system and so reduce supply problems, consumption and emissions; study of processes that can increase the efficiency of plant by recovering energy from thermal waste and process optimization; study of new technological solutions (for example new materials) in order to increase the reliability of plant operating in a flexible system.