One obvious possibility is that a massive "tether" type system in orbit around Earth magnetosphere, or outside of Earth's orbit, placed into proper position, will produce and harness significant amounts of electrical current which can be used in space and potentially beamed back to Earth.
A solar "sail" might be feasible by capturing the momentum of the high speed "strahl" electrons (cathode rays) streaming from the sun, and the momentum of the high speed cosmic rays streaming toward the sun. That is another potential technology that could begin with an EU/PC oriented understanding of space.
With the introduction of private enterprise into space now, the LCDM mainstream won't be able to "keep a lid" on the electrical nature of space for much longer. It seems like the next couple of decades of private space exploration will drive innovation in space technologies, not NASA or governmental organizations. The governmental organizations are too mired in politics, but private enterprise will figure out a way to make EU/PC theory profitable.