This lecture presents Ennéris, a company developing eco-friendly energy storage and management solutions based on major technological innovations in the fields of hydropneumatics and power electronics. The lecture discusses the limitations of traditional energy sources, the environmental issues posed by electrochemical batteries, and the development of a hydraulic compressor using water to compress air, offering a cleaner and more efficient alternative for renewable energy utilization. The instructor shares a vision of bringing this technology to remote African villages to power solar pumps and stimulate economic activities.