This book is for students and professionals of any discipline interested in renewable energy for a sustainable future of mankind. Batteries, fuel cells, capacitors, electrolyzers and solar cells are explained from the molecular level to the power plant level, in their historical development, in their economical and political impact, and social change. Fossil fuels and biomass energy are shown for comparison. Cases from geophysics and astronomy show that electrochemistry is not confined to the small scale. Examples are shown and exercised.