That would be: "10% IF we have some technical break-throughs".
Learn how heat from the Earth is converted into electricity in this comprehensive overview, including a discussion of the geothermal resource, its environmental and societal impacts, and its potential for future expansion.
www.ucsusa.org
An MIT study estimated that the United States has the potential to develop 44,000 MWs of geothermal capacity by 2050 by coproducing geothermal electricity at oil and gas fields—primarily in the Southeast and southern Plains states. The study projected that such advanced geothermal systems could supply 10 percent of U.S. baseload electricity by 2050, given R&D and deployment over the next 10 years
Hydro-power has too large of a footprint on the environment of sensitive areas. I'm no fan of it for that reason. Also, I don't want that pipeline for the same reason. If rail is unsafe then make it safer. I oppose nuclear energy too. To me, oil and all fossil fuels are just stop gap energy sources until we get our act together on a combination of sources, that would include solar, wind, tidal, ocean waves, geothermal. . Energy supply is only one part of the solution. Carbon neutral society means changing how we live, work and play. Also changes in how we deliver and manage energy delivery. I'd rather we invest in that than the effing pipeline.
The following may be dated but I think it does a pretty good job of breaking down the potential for different energy solutions:
Sustainable Energy — without the hot air David JC MacKay