A closed Organic Rankine Cycle binary power plant system (10A, 40) through which an organic motive fluid circulates, comprising: a) a heat source producing a heat source fluid; b) a vaporizer of said ORC, to which the heat source fluid is introducible and configured to vaporize the organic motive fluid circulating in said closed ORC by the heat source fluid in heat exchange relation therewith and to produce wet organic motive fluid vapor having a quality of at least approximately 80 percent, wherein said vaporizer has two outlets; and c) a multi-stage organic vapor turbine (30A, 30A') of said ORC having an inlet (31A, 52) for receiving said wet organic motive fluid vapor, wherein said organic vapor turbine is suitable to expand said wet organic motive fluid vapor, wherein a first line extends from a first of said two outlets of said vaporizer to the turbine inlet which is upstream to a first stage of said organic vapor turbine and a second line extends from a second of said two outlets of said vaporizer to an intermediate stage (58B, 58C) of said organic vapor turbine, characterized in that said organic vapor turbine (30A, 30A') is adapted to expand said wet organic motive fluid vapor introduced into the turbine inlet from a state (g) being within a liquid-vapor regime to a state (h) being within a superheated vapor regime, said system further comprising: d) an injection nozzle fitted in a penetration formed in an outer annular housing of said organic vapor turbine and in fluid communication with the second line and with an interior chamber of said organic vapor turbine which is directly upstream to the intermediate stage (58B, 58C), wherein said injection nozzle is configured to induce a pressure drop in the organic motive fluid injected through the second line, after the injected organic motive fluid has been exposed within the interior chamber to reduced pressure of the expanded superheated vapor (W'), causing a portion (L') of the injected organic motive fluid that has been discharged from said injection nozzle to undergo a vapor-producing evaporation process, to produce additional organic motive vapor and to thereby increase a flow rate of the organic motive fluid flowing through the intermediate stage. a) a heat source producing a heat source fluid; b) a vaporizer of said ORC, to which the heat source fluid is introducible and configured to vaporize the organic motive fluid circulating in said closed ORC by the heat source fluid in heat exchange relation therewith and to produce wet organic motive fluid vapor having a quality of at least approximately 80 percent, wherein said vaporizer has two outlets; and c) a multi-stage organic vapor turbine (30A, 30A') of said ORC having an inlet (31A, 52) for receiving said wet organic motive fluid vapor, wherein said organic vapor turbine is suitable to expand said wet organic motive fluid vapor, wherein a first line extends from a first of said two outlets of said vaporizer to the turbine inlet which is upstream to a first stage of said organic vapor turbine and a second line extends from a second of said two outlets of said vaporizer to an intermediate stage (58B, 58C) of said organic vapor turbine, characterized in that said organic vapor turbine (30A, 30A') is adapted to expand said wet organic motive fluid vapor introduced into the turbine inlet from a state (g) being within a liquid-vapor regime to a state (h) being within a superheated vapor regime, said system further comprising: wherein a first line extends from a first of said two outlets of said vaporizer to the turbine inlet which is upstream to a first stage of said organic vapor turbine and a second line extends from a second of said two outlets of said vaporizer to an intermediate stage (58B, 58C) of said organic vapor turbine, characterized in that said organic vapor turbine (30A, 30A') is adapted to expand said wet organic motive fluid vapor introduced into the turbine inlet from a state (g) being within a liquid-vapor regime to a state (h) being within a superheated vapor regime, said system further comprising: d) an injection nozzle fitted in a penetration formed in an outer annular housing of said organic vapor turbine and in fluid communication with the second line and with an interior chamber of said organic vapor turbine which is directly upstream to the intermediate stage (58B, 58C),