[Digory]

At this stage, they're still selling ideas for funding. So the question is what claims lead to optimal cost of funding?

There are all kinds of people throwing private and government money at sustainable energy, with the expectation that it will only moderately succeed. Witness this weeks' "ignition" announcement, brought to you by nuclear weapons(!)

Even Death, destroyer of Worlds, needs a sustainable energy angle to justify their funding to Congress.