Minus Elon Musk ... like who are the big players though?
There is no cartel that "owns" a distributed generation and transmission future. Transmission systems operators are typically non-profits, utilities are heavily regulated, which leaves opportunities for generators (solar, wind, natural gas, batteries), residential consumers (rooftop solar), and industrial consumers (load shedding, batteries for reductions in demand charges, on-site colo generation).
How about this guy he is building a battery factory in australia and is trying to buy part of GM's car manufacturing plant that was shutdown.