This publication titled, "Alternative Energy" provides the broadest possible overview of alternative energy. Major aspects covered in this book include-Alternative energy from tidal power; Alternative energy from biomass and biofuel; Alternative energy from geothermal power; Alternative energy from hydro-electricity; Alternative energy from nuclear power; Alternative energy from solar power; and Alternative energy from wave energy. Challenges with storage and use of alternative energy sources are covered in detail. Bibliography is given to facilitate further readings and research on the subject.