Electrical power generating system, comprising: an electrical generator; a drum operatively coupled to the generator; a cable winded around the drum; and at least one load car travelling on mechanical, magnetic or pneumatical rails between an upper position (12.2) and a lower position (12.3) under the action of gravity, wherein the drum, the cable and the load car are configured such that in its downward movement, the load car pulls the cable which rotates the drum; the system comprising: a plurality of unit loads configured for being loaded into, and unloaded from, the load car; a lifting subsystem for lifting unit loads; the subsystem (40, 41) comprising a water power recovery device (50, 51) and a charging car (2, 2.5, 2.6) moved by the water power recovery device (50, 51), the charging car being moved between a loading position (2.1) where it receives unit loads from the load car in its lower position (12.1) and an unloading position (2.2) where it transfers the unit loads to the load car in its upper position (12.2), the system being characterized in that it comprises: mechanical, magnetic or pneumatical rails supporting the charging car and having a deviating portion (8.1) making the charging car tilt nearby the unloading position (2.2), such that as to allow unit loads to be transferred by gravity to the load car, potentially via a buffer (6.1); and wherein the rails supporting the load car have a deviating portion (14.1) making the load car tilt nearby the lower position (12.1), such that as to allow unit loads to be transferred by gravity to the charging car, potentially via a buffer. an electrical generator; a drum operatively coupled to the generator; a cable winded around the drum; and at least one load car travelling on mechanical, magnetic or pneumatical rails between an upper position (12.2) and a lower position (12.3) under the action of gravity, wherein the drum, the cable and the load car are configured such that in its downward movement, the load car pulls the cable which rotates the drum; a plurality of unit loads configured for being loaded into, and unloaded from, the load car; a lifting subsystem for lifting unit loads; the subsystem (40, 41) comprising a water power recovery device (50, 51) and a charging car (2, 2.5, 2.6) moved by the water power recovery device (50, 51), the charging car being moved between a loading position (2.1) where it receives unit loads from the load car in its lower position (12.1) and an unloading position (2.2) where it transfers the unit loads to the load car in its upper position (12.2), the system being characterized in that it comprises: mechanical, magnetic or pneumatical rails supporting the charging car and having a deviating portion (8.1) making the charging car tilt nearby the unloading position (2.2), such that as to allow unit loads to be transferred by gravity to the load car, potentially via a buffer (6.1); and wherein the rails supporting the load car have a deviating portion (14.1) making the load car tilt nearby the lower position (12.1), such that as to allow unit loads to be transferred by gravity to the charging car, potentially via a buffer. mechanical, magnetic or pneumatical rails supporting the charging car and having a deviating portion (8.1) making the charging car tilt nearby the unloading position (2.2), such that as to allow unit loads to be transferred by gravity to the load car, potentially via a buffer (6.1); and wherein the rails supporting the load car have a deviating portion (14.1) making the load car tilt nearby the lower position (12.1), such that as to allow unit loads to be transferred by gravity to the charging car, potentially via a buffer.