The upgraded design of the liquid-cooled generator GTEG series (base model GTEG-500) during the qualification tests has shown a stable level of generating power of 650W. The generator is assigned the new designation GTEG-600. It provides the supply of electric power with a guaranteed capacity of at least 600 W and heat energy of the working fluid up to 12 kW. The use of the generator allows to create stand-alone electric and heat power plant. It provides electric and heat energy to remote facilities with minimum maintenance once a year.