The latest climate conferences (COP21 and COP22) have made it clear that the future will be different: although our fossil energy resources are declining, our energy demand will continue to increase by 2050 simply in the face of population growth and greater global access to energy. Regardless of the scenarios envisaged, a common point is a strong development of the use of renewable energy from wind and solar sources. However, it is clearly identified that this deployment will only be possible through optimised storage solutions taking into account the availability of the resource and its reliability. Several alternatives, other than batteries, are considered: power transfer station by pumping, electrochemical storage, compressed air, or other energy carriers such as hydrogen, ammonia, methane or methanol, via water electrolysis, among others. These energy carriers can be used either through fuel cells or through the generation of electricity via a generator or turbine. It is also quite easy to imagine, that such power generation station "Power-to-Gas-to-Power (renewable energies + energy carrier' + generators) could also simultaneously recover biogas from a waste upgrading station. The Energy Combustion Equipment Engines, for...