Process for the conversion and storage of energy, and the demand-based recovery thereof in power, heating and combined heat and power stations by means of water vapor sorption processes with alkaline solutions, wherein an alkaline solution, preferably sodium hydroxide solution, is cyclically changed in its concentration by time-displaced continuous absorption (B') and desorption (A') of water vapor within predetermined limits, wherein • the concentration of the alkaline solution is increased under single-stage or multi-stage boiling pressures by supplying external energy via heat carriers in the form of sensible heat or condensation heat recuperatively to these desorption stages and the condensation heat of resulting desorption vapors is also used for heating desorption stages and/or is supplied to external use, • water vapor is again supplied to the alkaline solution (4', 15', 19') enriched by desorption and the heat released by absorption is recuperatively removed to a heat transfer medium, which evaporates under increased pressure compared to the absorption pressure or whose sensible heat is used in a steam process or in a flash evaporation above absorption pressure for the production of vaporous working medium which performs technical work in an expansion, preferably for the production of electrical energy, • the products poor and enriched alkaline solution as well as water of the sorption process are stored essentially under ambient pressure separately from one another in a storage (21, 13', 12') and are supplied from there to the desorption and absorption stages (A', B') as required, • wherein at least a part of the desorption vapor is compressed and thereafter used as heating vapor for the recuperative transfer of heat in the desorption, while the condensation heat of the desorption vapor to be discharged from the process is discharged to the environment or to an in-process heat accumulator or to a heat transfer medium. • the concentration of the alkaline solution is increased under single-stage or multi-stage boiling pressures by supplying external energy via heat carriers in the form of sensible heat or condensation heat recuperatively to these desorption stages and the condensation heat of resulting desorption vapors is also used for heating desorption stages and/or is supplied to external use, • water vapor is again supplied to the alkaline solution (4', 15', 19') enriched by desorption and the heat released by absorption is recuperatively removed to a heat transfer medium, which evaporates under increased pressure compared to the absorption pressure or whose sensible heat is used in a steam process or in a flash evaporation above absorption pressure for the production of vaporous working medium which performs technical work in an expansion, preferably for the production of electrical energy, • the products poor and enriched alkaline solution as well as water of the sorption process are stored essentially under ambient pressure separately from one another in a storage (21, 13', 12') and are supplied from there to the desorption and absorption stages (A', B') as required, • wherein at least a part of the desorption vapor is compressed and thereafter used as heating vapor for the recuperative transfer of heat in the desorption, while the condensation heat of the desorption vapor to be discharged from the process is discharged to the environment or to an in-process heat accumulator or to a heat transfer medium.