Introduction / Gerard M. Crawley. -- Energy, power, units, and conversions / Gerard M. Crawley. -- Coal / Thomas Sarkus, Adrian Radziwon, and William Ellis. -- Petroleum liquids / William L. Fisher. -- Natural gas / John B. Curtis. -- Nuclear power / Bertrand Barré. -- Magnetic fusion energy / R.J. Goldston and M.C. Zarnstorff. -- Progress toward inertial fusion energy / Erik Storm. -- Energy from photovoltaics / Ignacio Rey-Stolle. -- Concentrating solar thermal power / Wes Stein. -- Biomass / Mark Downing and Anthony F. Turhollow Jr. -- Geothermal energy / Gordon Bloomquist, John Lund, and Magnus Gehringer. -- Hydropower and pumped storage / Torbjørn K. Nielsen. -- Wind energy / Jos Beurskens and Arno Brand. -- Ocean energy / Ian Bryden. -- Oceant thermal energy conversion / Gérard C. Nihous. -- Capacitive electric storage / Lu Wei and Gleb Yushin. -- Batteries / Habiballah Rahimi-Eichi and Mo-Yuen Chow. -- Fuel cells and the hydrogen economy / John T.S. Irvine, Gael P.G. Corre, and Xiaoxiang Xu. -- Electrical grids / Róisin Duignan and Mark O'Malley. -- Energy use and energy conservation / V. Ismet Ugursal. -- The earth's energy balance / Gerard M. Crawley.