The hygroscopic cycle is a power cycle that operates with steam and hygroscopic compounds. These compounds absorb steam at low pressure and temperature that has been expanded in the turbine and desorbed therefrom in the generator under the required operating conditions. In the absorber, the enthalpy of the steam is utilized and increased in the generator with the provision of heat. The turbine is able to work at high vacuums and cooling temperatures above the exit temperature of the steam in the turbine. The invention comprises the following main items of equipment: absorber, dissolution pump, condensation pump, heat recovery means, thermal degasser, steam generator, steam separator, expansion valve, air cooler or cooling tower, superheater, steam turbine and, optionally, hydraulic turbine, inverse-osmosis system and absorption/adsorption machine. It may include many of the improvements made to the Rankine cycle, being characterized by the incorporation of the physical and chemical principles of absorption machines for achieving better performance from the Rankine cycle and improved cooling conditions.