What's the deal with electrolyzers?
In this episode, Raffi Garabedian, CEO of startup Electric Hydrogen, discusses all things electrolyzer, the current hydrogen market, and the future risks and opportunities for green hydrogen.
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Text transcript:
David Roberts
Volts subscribers are likely well aware of the fact that a fully decarbonized energy system is going to require an enormous amount of hydrogen to fill in the gaps left by wind and solar. What's more, they are probably aware that hydrogen comes in a dazzling variety of colors, from blue to gray to brown, depending on the carbon intensity of the production.
In the end, though, only one such color matters: green. That is to say, a fully decarbonized energy system is going to require lots and lots of hydrogen made with renewable energy, with no carbon emissions. The way to do that is to run water and electrical current through an electrolyzer, which splits the hydrogen off from the oxygen.
Currently, about 95 percent of the world's hydrogen is made using fossil fuels. Green hydrogen — hydrogen made with renewable energy and electrolyzers — comprises only a sliver of the remaining 5 percent. Yet it’s going to have to scale up to 100 percent in the next several decades, even as demand for hydrogen rises.
This is all a familiar story, at least to energy nerds. But if you're anything like me, the more you think about it, the more you realize that, despite the key role they play in that story, you don't actually know very much about electrolyzers themselves. What are they, exactly? What do they look like? How can they be improved? What policy is supporting them?
To talk through these questions, I contacted Raffi Garabedian, the CEO of Electric Hydrogen, a startup that has set out to rapidly drive down the cost of green hydrogen. Garabedian, who was previously chief technology officer at First Solar, believes that the market for green hydrogen today is roughly where the solar market was in 2008, with all the attendant risks and opportunities.
Garabedian (quite patiently) walked me through the basics of electrolyzers, the current state of the market and the technology, the kind of cost improvements he believes are possible within the next five years, the increasingly supportive policy environment, and the future of green hydrogen.
With no further ado, Raffi Garabedian, welcome to Volts. Thank you so much for coming.
Raffi Garabedian
It's great to be here, David.
David Roberts
I'm excited to talk today about electrolyzers because I think I am, and I think probably most of my listeners are already convinced that hydrogen is going to play an important role in a decarbonized electricity system. I think we can just assume that. And I already think, and I think my listeners probably already know this too, that in a true decarbonized system, it's going to have to be so called "green hydrogen," hydrogen made without greenhouse gases. I know there are 50 other colors made from different other things with varying levels of greenhouse gas production. But, I think—and obviously you think, since you've predicated your business on it—that we got to make green hydrogen work.
And green hydrogen is hydrogen made with renewable electricity and electrolyzers. So, we know all that. But I find that when I think about the technologies involved, I have a pretty good understanding of all the pieces of that puzzle, except for electrolyzers. They're just kind of this thing that plugs into a certain spot in the diagram. But I find that when I actually focus in on it and think about it, I turn out to know very little about electrolyzers. So I'm very excited to have you on the pod today because I suspect I'm not the only one who has that sort of gap in my knowledge. So maybe we can just start with: what is an
