The Science Power Platform (SPP) (Russian: Научно-энергетическая платформа) was a planned Russian element of the International Space Station (ISS) that was intended to be delivered to the ISS by a Russian Proton rocket or Zenit rocket (it was originally designed to be part of Mir-2) but was shifted to launch by Space Shuttle as part as a tradeoff agreement on other parts of the ISS. It would have provided additional power for the ISS as well as roll axis control capability for the orbital facility. The SPP would have had eight solar arrays and a robotic arm provided by the European Space Agency (ESA) dedicated to maintaining the SPP. The robotic arm (European Robotic Arm) is still going to be part of the station, now scheduled to fly alongside the Russian Multipurpose Laboratory Module by a Russian Proton rocket in 2012. If the Science Power Platform had been delivered to the ISS, it would have been attached to the zenith port of Zvezda, a position already occupied by MRM-2.
An agreement was reached in March 2006 by the Russians and NASA in order to provide part of the power the Russian segments need from the four American solar arrays. Originally the SPP should have made the power supply of the four Russian modules independent from the power supply of the rest of the station. The already-made pressurised hull of a static test article for this component is now being used for the Russian Mini Research Module 1, which launched on STS-132 in 2010. MRM1 is docked to the Zarya nadir port.
RKK Energia, the manufacturer of the ROS components, has proposed to execute something similar to the original ISS plan with the addition of a Nodal Module (with six docking ports) and two additional science/energy modules to the segment around 2013-2015. The science/power modules would have solar arrays similar to the SPP, but unlike it the truss structure would be much smaller.
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