High-Temperature Electrolysis

This got a mention a few days back and here's an article with a lot more information on the how of the technique. The nub of the matter is that the high temperature offsets some of the electrical energy need for electrolysis. As such, as the article points out, it need not be a nuclear power plant producing it. I wonder whether geysers produce hot enough water?

Green Car Congress: Milestone for H2 Production by High-Temperature Electrolysis