HMM: Elon Musk on SpaceX, Tesla, and Why Space Solar Power Must Die. I certainly agree with this:

SpaceX isn’t just in it to make money on those contracts. Ultimately, Musk envisions a self-sustaining civilization on Mars—thus his remark about becoming an interplanetary species. That way, in case the worst happens and Earth is obliterated or used up, “the light of consciousness is not extinguished.” But his vision requires tens of thousands or even millions of people on the red planet. “We’d need really big rockets launching a lot,” he says.

But I’m more positive on space solar power.