Amazing, it is as if all the great feats of space exploration in the 60's and 70's, and the grand plans we had to follow up with space colonies, lunar colonies, space power and asteroid mining are all just strange myths from a distant past.
This was all conceived back in the 70's. http://www.nss.org/settlement/ColoniesInSpace/colonies_chap03.html
It was even remotely possible back then. It can certainly be done now.
Would it be safe? Yes. Would it be practical? Possibly, depending on how it is done. Is it less objectionable than other forms of energy? Not to those who understand it, want it, and appreciate the long term benefits... but they are few.
We can't use abundant, cheap coal because of irrational fears of CO2. We can't use nuclear because of only slightly less irrational fears of radioactive waste. We can't use wind because it's big and noisy and no one wants it near them. We won't be able to use Orbital Solar Power because "the microwaves will cook us", "the energy balance of the Earth will be disrupted", "the big satellites will ruin the night sky" and a host of other silly reasons.
Such a pity. Building these first PowerSats could herald the new age of Space Colonization. More likely fear and ignorance will keep us trapped on this muddy little rock for the rest of time.