Quantum technologies are currently the object of high expectations from governments and sophie allport zebra private companies, as they hold the promise to shape safer and faster ways to extract, exchange, and treat information.However, despite its major potential impact for industry and society, the question of their energetic footprint has remained in a blind spot of current deployment strategies.In this Perspective, I argue that quantum technologies must urgently plan for here the creation and structuration of a transverse quantum energy initiative, connecting quantum thermodynamics, quantum information science, quantum physics, and engineering.Such an initiative is the only path towards energy-efficient, sustainable quantum technologies, and to possibly bring out an energetic quantum advantage.