A system comprising: a turbine rotor including one or more blades attached to the turbine rotor, the blades configured to produce a rotor torque on the rotor in response to an applied loading; a power split transmission coupling comprising: an input shaft coupled to the turbine rotor, the input shaft rotatable according to the rotor torque; an output shaft rotatable at an output speed; a cam ring and a hub disposed between the input shaft and the output shaft, a hydraulic fluid disposed between the cam ring and the hub, wherein the hub includes a plurality of circumferentially spaced slots configured to house a plurality of vanes therein, the plurality of vanes configured to be movable between a retracted position, a fully extended position, or any partially extended position therebetween; in the retracted position, the input shaft is independently rotatable with respect to the output shaft; in the one or more extended positions, the plurality of vanes are configured to work the hydraulic fluid and transmit torque from the input shaft to the output shaft at an adjustable torque ratio; an inlet port communicatively coupled to a hydraulic fluid source, the hydraulic fluid transportable from the hydraulic fluid source to the power split transmission coupling; an outlet port having a closed configuration and an at least partially open configuration, the hydraulic fluid releasable from the power split transmission coupling through the outlet port in response to a power applied to the output shaft exceeding a threshold power, wherein the released hydraulic fluid exits the power split transmission coupling and is stored under pressure; a hydraulic motor including a motor output configured to receive the hydraulic fluid stored under pressure and generate a torque on the motor output in response; and a generator operatively coupled to the output shaft and the motor output, wherein the generator produces electrical power in response to at least one of the rotation of: the output shaft, the torque of the motor output, or both. a turbine rotor including one or more blades attached to the turbine rotor, the blades configured to produce a rotor torque on the rotor in response to an applied loading; a power split transmission coupling comprising: an input shaft coupled to the turbine rotor, the input shaft rotatable according to the rotor torque; an output shaft rotatable at an output speed; a cam ring and a hub disposed between the input shaft and the output shaft, a hydraulic fluid disposed between the cam ring and the hub, wherein the hub includes a plurality of circumferentially spaced slots configured to house a plurality of vanes therein, the plurality of vanes configured to be movable between a retracted position, a fully extended position, or any partially extended position therebetween; in the retracted position, the input shaft is independently rotatable with respect to the output shaft; in the one or more extended positions, the plurality of vanes are configured to work the hydraulic fluid and transmit torque from the input shaft to the output shaft at an adjustable torque ratio; an inlet port communicatively coupled to a hydraulic fluid source, the hydraulic fluid transportable from the hydraulic fluid source to the power split transmission coupling; an outlet port having a closed configuration and an at least partially open configuration, the hydraulic fluid releasable from the power split transmission coupling through the outlet port in response to a power applied to the output shaft exceeding a threshold power, wherein the released hydraulic fluid exits the power split transmission coupling and is stored under pressure; an input shaft coupled to the turbine rotor, the input shaft rotatable according to the rotor torque; an output shaft rotatable at an output speed; a cam ring and a hub disposed between the input shaft and the output shaft, a hydraulic fluid disposed between the cam ring and the hub, wherein the hub includes a plurality of circumferentially spaced slots configured to house a plurality of vanes therein, the plurality of vanes configured to be movable between a retracted position, a fully extended position, or any partially extended position therebetween; in the retracted position, the input shaft is independently rotatable with respect to the output shaft; in the one or more extended positions, the plurality of vanes are configured to work the hydraulic fluid and transmit torque from the input shaft to the output shaft at an adjustable torque ratio; an inlet port communicatively coupled to a hydraulic fluid source, the hydraulic fluid transportable from the hydraulic fluid source to the power split transmission coupling; an outlet port having a closed configuration and an at least partially open configuration, the hydraulic fluid releasable from the power split transmission coupling through the outlet port in response to a power applied to the output shaft exceeding a threshold power, wherein the released hydraulic fluid exits the power split transmission coupling and is stored under pressure; a hydraulic motor including a motor output configured to receive the hydraulic fluid stored under pressure and generate a torque on the motor output in response; and a generator operatively coupled to the output shaft and the motor output, wherein the generator produces electrical power in response to at least one of the rotation of: the output shaft, the torque of the motor output, or both.