Energy efficiency technologies that exist today or that are likely to be developed in the near future could save considerable money as well as energy, says a new report from the National Research Council.  Fully adopting these technologies could lower projected U.S. energy use 17 percent to 20 percent by 2020, and 25 percent to 31 percent by 2030. Achieving full deployment of these efficiency technologies will depend in part on pressures driving adoption, such as high energy prices or…