As environmental awareness continues to grow, gas engine power generators (so-called gen-sets) are gaining in importance. Modern gen-sets can run both on natural gas and on various forms of biogas. They are also increasingly employed in combined heat and power plants, in which electricity and heat are generated very efficiently at local sites where they are needed. To adapt such gen-sets to electricity networks involving different frequencies, special gear systems are installed between the engine and the generator to adapt generator speed accordingly. Obviously the key issue in this field of application is achieving maximum efficiency, which is why plant suppliers have relied on the Eisenbeiss specialists for many years. Hundreds of Eisenbeiss gear systems are in reliable operation in this sector.