A hybrid powertrain system includes an input member, first and second torque machines, a differential gear set including first, second and third elements, an output member, and first, second, and third selectable one-way clutches (SOWC), each operative in one of a respective deactivated state and a respective plurality of activated states. The second torque machine is rotatably coupled to the first element of the differential gear set, and the output member is rotatably coupled to the second element of the differential gear set. The first SOWC is configurable to prevent rotation of the third element of the differential gear set in a first rotational direction when controlled to a first one of the respective plurality of activated states, and configurable to prevent rotation of the third element of the differential gear set in a second rotational direction opposite the first rotational direction when controlled to a second one of the respective plurality of activated states. The first torque machine is coupled to the third element of the differential gear set only when the second SOWC is controlled to one of the respective plurality of activated states. And, the third element of the differential gear set coupled to the input member only when the second and third SOWCs are each controlled to one of the respective plurality of activated states.