FIELD: systems for lowering high pressure of natural gas, for example in wells or in main pipelines until pressure value necessary for consumer use. SUBSTANCE: energy recovery plant having inlet connected with well or with increased pressure main pipeline and outlet connected with lowered pressure main pipeline or with gas consumer includes expander (for example expanding gas turbine). Expander has at least two parts arranged in direction of pressure lowering; kinematically joined with expander converter of mechanical energy, for example electric generator; and at least two heat exchangers. EFFECT: enhanced recovery degree of cold created at lowering gas pressure, production of large amounts of energy and cold, enhanced efficiency of plant. 3 cl, 3 dwg
