Method for storing and recovering energy in which, in an energy storage period, an air liquefaction product (LAIR) is formed and, in an energy recovery period, a pressurized stream is formed and expanded to perform work by using at least part of the air liquefaction product (LAIR), the method comprising: for the formation of the air liquefaction product (LAIR), - compressing air in an air conditioning unit, at least by means of at least one isothermally operated compressor device (12, 16), and adsorptively purifying the air by means of at least one adsorptive purification device at a superatmospheric pressure level, - liquefying the compressed and adsorptively purified air (HPAIR) starting from a temperature level in a range of 0 to 50°C in a first fraction in a fixed-bed cold storage unit and in a second fraction in a counterflow heat exchanger unit at a liquefaction pressure level in a range of 40 to 100 bara, and - subsequently expanding the liquefied air (HPLAIR) in at least one cold production unit, and, for the formation of the pressurized stream, - producing a vaporization product (HPAIR) from at least part of the liquefaction product (LAIR) at a vaporization pressure level which deviates by no more than 5 bar from the liquefaction pressure level, in the fixed-bed cold storage unit, and - forming a fluid stream from at least part of the vaporization product (HPAIR) and conducting it through at least one combustion device in which a fuel is burned, wherein the method comprises feeding to the at least one adsorptive purification device a regenerating gas which is formed from part of the air (HPAIR) that is previously compressed and adsorptively purified in the air conditioning unit. for the formation of the air liquefaction product (LAIR), - compressing air in an air conditioning unit, at least by means of at least one isothermally operated compressor device (12, 16), and adsorptively purifying the air by means of at least one adsorptive purification device at a superatmospheric pressure level, - liquefying the compressed and adsorptively purified air (HPAIR) starting from a temperature level in a range of 0 to 50°C in a first fraction in a fixed-bed cold storage unit and in a second fraction in a counterflow heat exchanger unit at a liquefaction pressure level in a range of 40 to 100 bara, and - subsequently expanding the liquefied air (HPLAIR) in at least one cold production unit, - compressing air in an air conditioning unit, at least by means of at least one isothermally operated compressor device (12, 16), and adsorptively purifying the air by means of at least one adsorptive purification device at a superatmospheric pressure level, - liquefying the compressed and adsorptively purified air (HPAIR) starting from a temperature level in a range of 0 to 50°C in a first fraction in a fixed-bed cold storage unit and in a second fraction in a counterflow heat exchanger unit at a liquefaction pressure level in a range of 40 to 100 bara, and - subsequently expanding the liquefied air (HPLAIR) in at least one cold production unit, and, for the formation of the pressurized stream, - producing a vaporization product (HPAIR) from at least part of the liquefaction product (LAIR) at a vaporization pressure level which deviates by no more than 5 bar from the liquefaction pressure level, in the fixed-bed cold storage unit, and - forming a fluid stream from at least part of the vaporization product (HPAIR) and conducting it through at least one combustion device in which a fuel is burned, - producing a vaporization product (HPAIR) from at least part of the liquefaction product (LAIR) at a vaporization pressure level which deviates by no more than 5 bar from the liquefaction pressure level, in the fixed-bed cold storage unit, and - forming a fluid stream from at least part of the vaporization product (HPAIR) and conducting it through at least one combustion device in which a fuel is burned, wherein the method comprises feeding to the at least one adsorptive purification device a regenerating gas which is formed from part of the air (HPAIR) that is previously compressed and adsorptively purified in the air conditioning unit.