100% renewable energy is practical by 2050

According to a new report from Stanford University researchers, we could move to 100% renewable energy by 2050 using only technology that's currently available.   The biggest obsticles are political, including the building of more interstate power lines.  This approach would save the average person $3,400 a year compared to the current mix of energy sources, and doesn't even begin to factor in possible improvements in energy efficiency.  It also doesn't assume the use of nuclear power.  One of the biggest social changes is a move to an auto population that is completely powered by electricity or hydrogen.  This is a clear statement from very well informed sources that such a future is easily possible, given the political will.