Energy Generation in Space

Hello everyone, this is my first post here. I'm working on a
Masters at University of North Dakota and would like to ask a
question and possibly open a debate.

Here goes: Let's take stock of all the options for power
generation in space. Viewed from the perspective of supporting human
life, space is a difficult and dangerous place. However, viewed from
the perspective of generating energy, space may be a very fertile
environment. What I would like to propose is that we do some
unconventional thinking, look past the well-known SPS concept, and
list some other possibilities. What else is there? What ideas need to
be revisited? What new concepts are emerging? Is there a convergence
between near-term lunar exploration and the capacity to
construct any form of power generation plant in space in the next 20
years? I would ask that we list the possibilities, and speak to the
near-term potential for implementation.

Let me start by throwing out two:

1. Large scale photovoltaic SPS in orbit, beams power to rectenna on
Earth's surface. Tends to be very large, difficult to assemble,
suffers from heavy on-board power transmission. Elegance of direct
solar power to electricity is limited by today's low-efficiency
photovoltaic technology.

2. Helium 3 derived from the Moon to power fusion generators on
Earth. Great fuel, but you need working fusion plants, which we
cannot expect for decades.

So, here's your chance - especially those of you with advanced
degrees. What else is there? If you had the opportunity to advise the
nation on how to exploit the space environment to offer a credible
energy alternative, what would you suggest?