Modern designs are a lot different than those monolithic '70s designs. Now it's a bunch of mass-produced small parts self-assembled in orbit, with a phased-arra

Modern designs are a lot different than those monolithic '70s designs. Now it's a bunch of mass-produced small parts self-assembled in orbit, with a phased-array transmitter. Manufacturing's way cheaper that way, once you start scaling a bit. (See NASA's SPS-ALPHA project or the book The Case for Space Solar Power.) The other big change is the prospect of $50/kg to LEO with Starship. Falcon Heavy's advertised price is already down to $600/kg.