Recent decades have seen huge growth in the renewable energy sector, spurred on by concerns about climate change and dwindling supplies of fossil fuels. One of the major difficulties raised by an increasing reliance on renewable resources is the inflexibility when it comes to controlling supply in response to demand. For example, solar energy can only be produced during the day. The development of methods for storing the energy produced by renewable sources is therefore crucial to the continued stability of global energy supplies. However, as with all new technology, it is important to consider the environmental impacts as well as the benefits. This book brings together authors from a variety of different backgrounds to explore the state-of-the-art of large-scale energy storage and examine the environmental impacts of the main categories based on the types of energy stored. A valuable resource, not just for those working and researching in the renewable energy sector, but also for policymakers around the world.