Thanks to the integration of different areas, sector coupling makes it possible to exploit synergies and to achieve a high degree of efficiency. This happens when we talk about high-efficiency cogeneration, where the electrical and thermal sectors are combined. But what happens if we also take into consideration the biomethane/RNG sector? Biomethane cogeneration translates not only in the integration of the three sectors, but also adds the renewable element to efficiency, creating winning synergies.