Earth-Moon L1

My vote is also for an SPS demonstration unit at L1.

Look for efficiency of solar power cells to jump to 50-60 percent over
the next five to ten years.

Cost of new, efficient photovoltaics may drop to about the cost of LEDs.

http://www.lbl.gov/Science-Articles/Archive/MSD-full-spectrum-solar-cell
.html

GOOGLE for "Full Spectrum Solar Cell" and enjoy the reading.

Very promising technology. Looks rather important to SPS.

CONJECTURE: It could be even more important to Earth-based deployment of
photovoltaics. This might attract much available investment money into
broader implementation of community and residential solar power.

Colin Keizer