Washington: US Secretary of Energy Ernest Moniz Friday announced two awards worth $425 million to build two supercomputers three times faster than China's Tianhe-2, the most powerful system in the world, as well as research extreme scale supercomputing technologies.

The US government will invest $325 million to build "Summit" at the Department of Energy's ( DOE) Oak Ridge National Laboratory in Tennessee and "Sierra" at its Lawrence Livermore Laboratory in California, Xinhua quoted Moniz as saying in a statement.