This is the second of three episodes about the solar-power revolution. Last week, we talked about how solar power got so cheap. This week, we’re talking with someone who is building giant plants around the world to take advantage of all that cheap, intermittent energy.

John O'Donnell is the co-founder of Rondo Energy. John’s problem is this: How do you turn intermittent energy into the cheap, reliable, intense heat that companies around the world need to make everything from steel beams to t-shirts?