NASA plans test of advanced nuclear power generator Spaceflight Now

Two of the robotic missions NASA selected for further study last week would be powered by experimental nuclear generators, a new technology under development to boost the efficiency of electricity production in deep space. NASA picked robotic missions to Mars, a comet and Saturn’s moon Titan as finalists last week for a launch opportunity in 2016, and two of the probes would employ a cutting edge nuclear power source never tested in space.
The space agency plans to settle on a single mission in June 2012, fully funding the winner for development and launch later this decade. Although NASA requires the missions to launch by the end of 2017, scientists in charge of all three probes target blastoff in 2015 or 2016.