The German energy transition focuses not only on the expansion of renewable energies but also on increasing energy efficiency in all areas. Both aspects are at the center of the completely redesigned manual on gas utilization technology. This standard work describes the production of green gas, the fundamentals of combustion theory, as well as domestic, commercial, and industrial applications, targeting engineers, planners, and technical management, as well as students, university lecturers, government employees, and career changers. The crucial role of increasingly greener gas in achieving climate goals, along with the technologies and devices for meeting the highest efficiency requirements, is clearly explained by leading figures in the gas and energy industry.