Renewable energy sources such as PV (photovoltaic) and wind turbines are now playing a significant role in the global energy mix. The inherently variable nature of this green power represents a major challenge for power grids that need to match generation and demand to ensure continuity of customer service. Inevitably, energy storage that can help smooth the peaks and troughs in output is becoming a vital element in the design of electricity networks. Saft has developed a range of battery technologies that deliver reliable and efficient energy storage in both off-grid and on-grid schemes, from the point of production through transmission and distribution to consumption.