Book excerpt: Variable Generation, Flexible Demand looks at a future in which power system researchers, operators and analysts need to predict variable renewable generation and schedule demand to match it. Contributors survey the significant expansion in the role of flexible demand in balancing supply and demand in conjunction with flexible generation in 'peaking plants' and energy storage as the proportion of variable renewable generation rises in many systems across the world. Supported with case studies, the book examines practical ways that demand flexibility can play a constructive role as more systems move towards higher levels of renewable generation in their electricity mix. - Examines practical ways that demand flexibility can play a constructive role in future energy systems - Reviews the vital role of market design, business models, enabling technologies, policies and regulation in implementation of flexible demand - Includes detailed case studies that address the role of flexible demand across transitioning power markets