The Paleo-energetique method looks at history to solve present challenges. The main objective of our work is to citizen-crowdsource the history of energies. Our aim is to collectively rediscover forgotten inventions, ideas, artist visions, stories about renewable energies and sustainable methodologies from the past. Our digital platform paleo-energetique.org is now available in 5 languages. We provide exhibitions, conferences, workshops, custom processes and methodologies for territories in energy transition. We selected some of our best discoveries to publish the book Rétrofutur, now available in French and Japanese.