Includes bibliographical references and index.

A need for alternative energy -- Water in motion -- What is water power? -- A powerful history -- When did people start using water power? -- From water current to electrical current -- How can water power be used to create electricity? -- The big truth! -- Affecting the environment -- What are the downsides of using water power? -- Tides and waves -- How can people capture the energy of ocean waves? -- A bright future -- Will more people use electricity generated from water power in the future?