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 <i>Second Edition</i> 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.