A new edition of a successful book, this volume provides engineers in diverse disciplines with a thorough, up-to-date introduction to renewable and efficient energy systems. Offering significant updates to such topics as geothermal power, wave and tidal power, and ocean thermal energy, the Second Edition expands coverage of electric power grids, discusses smart grids and grid integration of renewable energy systems, and addresses the growing issue of off-grid renewable energy systems for emerging markets in the developing world. Completely worked numerical examples of every important concept are provided.