 It is capable of transferring up to 8 kW of power from the space station to the orbiter.With this upgrade both the shuttle and the ISS were able to use each other's power systems when needed, though the ISS never again required the use of an orbiter's power systems.During mission STS-116, PMA-2 (then at the forward end of the "Destiny" module) was rewired to allow for the use of the SSPTS.