its first major customer for the initial demonstration project. Intelsat entered into a preliminary agreement to purchase one-half of the propellant payload that the MDA spacecraft would carry into geostationary orbit. Such a purchase was projected to add somewhere between two and four years of additional service life for up to five Intelsat satellites, assuming 200 kg of fuel is delivered to each commsat. SIS was envisioned to carry a toolkit designed to open most of the approximately 40 types of "fueling systems aboard satellites now in geostationary orbit". Technical details The servicing plan for the initial satellite on the demonstration mission was: "Intelsat [would] select one of its satellites nearing retirement to be moved into a standard graveyard orbit some 200 to 300 kilometers above the geostationary arc 36,000 kilometers over the equator". MDA [was to] "launch the SIS servicer, which [would] rendezvous and dock with the Intelsat satellite, [and attach itself] to the ring around the satellite's apogee-boost motor". Controlled from a ground station, "the SIS robotic arm [was to] reach through the nozzle of the apogee motor to find and unscrew the satellite's fuel cap". "the SIS vehicle [would then] reclose the fuel cap after delivering the agreed amount of propellant and then head to its next mission". Post-demonstration mission extension In addition to refueling and servicing geostationary Communications satellites with the fuel that is initially launched with the vehicle, the SIS vehicle is being designed to have the ability to orbitally maneuver to rendezvous with a replacement fuel canister after deploying the of fuel in the first load, enabling the further refueling of additional satellites after the initial multi-satellite servicing mission is complete. Technology maturation by NASA MDA's commercial interest in robotic in-space refueling got a boost in 2013 when NASA completed a demonstration mission (phase 2) doing robotic refueling of satellite hardware that had never been designed for refuel. In January 2013, an extensive series of robotically-actuated propellant transfer experiments on the exposed facility platform of the International Space Station (ISS) were completed by the NASA Robotic Refueling Mission (RRM). The NASA Robotic Refueling Mission was launched in 2011. The set of experiments included a number of propellant valves, nozzles and seals similar to those used on a wide variety commercial and government satellites, plus a series of four prototype tools that could be attached to the distal end of a Space Station robotic arm.