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Q&A

Eric Dresselhuys, CEO of ESS, Makes the Case for Iron-Flow Batteries

An interview about the politics of energy storage — and whether different technologies can help

Eric Dresselhuys
Heatmap Illustration

While in Anaheim for RE+ last week, I met with Eric Dresselhuys, CEO of long duration iron-flow battery storage manufacturer ESS Inc. We chatted about battery fires, community buy-in, and the future of China policy. I came in expecting optimism and left feeling we need a lot more conversations like this one.

The following is an abridged version of our conversation that has been edited for clarity.

How does your product address the opinion that battery storage has a buy-in problem?

It’s not so much an opinion as just reporting the obvious, which is that lithium-ion batteries on the grid have a buy-in problem. Maybe if you’re in rural western Australia nobody cares because there are no human beings around, but if you look at the need for energy storage to facilitate the energy transition, it’s pretty clear we have to put batteries all over the place and specifically close to where human beings live. And that’s a problem.

Can iron-flow help solve that problem? I think unequivocally we can. It’s a very different architecture. It’s a battery that’s really designed from the beginning to operate as a grid backup battery. If you go back to look at lithium, it was never designed to go onto the grid. It was designed to go into camcorders, phones. This is not the technology I think anybody would’ve picked for the grid if they had started from scratch.

Are you seeing any change in demand for your product from protests over lithium battery projects?

I think it’s the old gag of all politics are local. The politics of siting is a local problem. What’s simultaneously true is adoption of storage on the grid is growing at a phenomenally high rate. And yet there are stories [about opposition] all over the place. There was just one up in Marin County, California, where the community said it’s in an area adjacent to wetlands. And they said you know what? We’re just not going to put a–

But are these communities opposed to lithium storage actually choosing iron-flow over these projects, or are they just saying no to any development?

Right now, they’re just saying no. The communities are not going to solve the problem. They’re going to tell you what is unacceptable and it’s going to be somebody else’s job to solve the problem.

I’ll use Schiphol Airport in Amsterdam [as an example]. They said, we have thousands of gallons of jet fuel laying around. And people. And airplanes. We can’t put a lithium battery out here. So they’re using an iron-flow and sought out a non-lithium battery to solve their energy storage problems because it was safer.

China policy looms large over the future of U.S. battery supplies. What do you think the final endgame will be of our approach to China’s dominance in this business segment?

It’s a great question that I don’t think I know the answer to. I think the next step is to try and get the playing field somewhat level. The amount of subsidy that goes into renewables in general and batteries in particular in China is daunting. People talk about the IRA and all these things as if it’s a lot of money, but it’s a pittance compared to what China is putting in.

Getting the playing field a little more level in the short term through a combination of incentives here and tariffs coming on will be a next step. Until we get carbon accounting — cradle-to-grave carbon accounting — it’ll be hard to get things totally level because in the U.S. we enforce environmental laws and we don’t employ prison labor to build [these] things. Until we get that full ESG accounting, I think there’s going to be some limitation.

Okay one fun question – what was the last song you listened to? Keeping ‘em honest here at Heatmap News.

“Impossible Germany” by Wilco.

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Spotlight

The 5 Fights to Watch in 2026

Spoiler: A lot of them are about data centers.

Data centers and clean energy.
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It’s now clear that 2026 will be big for American energy, but it’s going to be incredibly tense.

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  • Since we first reported this news, the lawsuit has escalated. Vistra’s attorneys have requested Sulphur Springs’ attorney be removed from the court proceedings because, according to screenshots of lengthy social media posts submitted to the court, the city itself has confirmed that the attorney dated a senior executive for MSB Global as recently as the winter of 2024.
  • In a letter dated December 10, posted online by activists fighting the data center, Vistra’s attorneys now argue the relationship is what led to the data center coming to the city in the first place, and that the attorney cannot argue on behalf of the city because they’ll be a fact witness who may need to provide testimony in the case: “These allegations make awareness of negotiations surrounding the deed and the City’s subsequent conduct post-transaction, including any purported ‘reliance’ on Vistra Parties’ actions and omissions, relevant.”
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A catch-up with kWh Analytics’ Jason Kaminsky.

Jason Kaminsky.
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This week’s conversation is a catch-up chat with Jason Kaminsky of kWh Analytics, an insurance firm that works with renewable energy developers. I reached out to Kaminsky ahead of the new year because as someone with an arms-length distance from development, I find he is able to speak more candidly about market dynamics and macro-level trends – as well as the fears many have in rural communities about energy project failures, like battery fires. Seeing as the theme this week felt like “data centers forever,” I also thought it would be good to get up to speed on what he’s most focused on in that space, too.

The following conversation has been lightly edited for clarity.

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