re: Error Corrected -- with fortuitous results!!!
I've cut in half the cost of a Solar Concentrator Beam Power Satellite's mirrored surface. If microwave relay satellites work as well, then only one powerplant is needed, at ~$69.42 billion, plus the wireframe structure, plus the relay satellites. Perhaps a total cost of $80-100 billion? Hard to say, but high-reflectance mirrors are probably a pricey item compared to any kind of space hardware.
I never said it would be cheap, just that it represents a 5000-fold improvement in launch capacity over the Shuttle fleet (or any rocket).