Energy is very important to the World. Energy use increases due to economic growth. As a result CO2 emissions increase and the climate changes. Clearly, the energy system needs to become more sustainable, which can also offer opportunities for businesses. The Energy research Centre of the Netherlands (ECN), the leading Dutch institute for energy innovation, is dedicated to realising this. The ECN develops high-quality knowledge and technology for the transition to sustainable energy management. It also introduces this knowledge and technology to the market. Our focus is on energy conservation, sustainable energy and an efficient and clean use of fossil fuels.