Concrete That Stores Energy Damian Stefaniuk On MIT's Breakthrough In Conductive Concrete

Summary

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Podcast Summary: The Good Question Podcast with Richard Jacobs

Episode: Concrete That Stores Energy – Damian Stefaniuk on MIT’s Breakthrough in Conductive Concrete

Date: May 6, 2026

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Episode Overview

This episode explores a groundbreaking innovation in building materials: electrically conductive concrete that acts as a massive building-integrated supercapacitor. Richard Jacobs interviews Dr. Damian Stefaniuk, a research scientist at MIT, about how this new material could turn everyday structures—houses, roads, runways—into large-scale energy storage solutions, fundamentally changing how we think about energy storage, sustainable construction, and even radiant heating.

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Key Discussion Points and Insights

1. How Does Conductive Concrete Work?

• Making Concrete Conductive:

  • Standard concrete isn't conductive. The breakthrough was achieved by adding nanocarbon black to the concrete mix, which forms a thorough, 3D interconnected network, granting both conductivity and supercapacitor capability.
  • “We use a special material, not that special because it’s just a carbon product, nanocarbon black…it has very high specific surface. So it can not only make the concrete electrically conductive, but also accommodates the architecture of a supercapacitor.” — Damian Stefaniuk (01:06)

• Mixing and Consistency:

  • The new mix is robust and user-friendly: cement, aggregate, nanocarbon black, and water added to a dry mix, then poured and handled like regular concrete.
  • “The beauty of it is that…we obtain each time the same [mix]. That’s actually the beauty of concrete…” — Stefaniuk (03:15)

2. How Does the Concrete Store Energy?

• ‘Bulk Supercapacitor’ Architecture:

  • The energy storage happens within the vast nanoscopic porosity of the concrete, rather than just on the surface. Mortar acts as a separator—analogous to a battery design.
  • “Our supercapacitor works…on the specific surface of that carbon black within the pore space.…What really matters is the volume.” — Stefaniuk (04:08)
  • “A single cell is composed of two electrodes…separated by a separator, which can be the mortar.” — Stefaniuk (05:00)

• Not Generating, Just Storing Power:

  • The conductive concrete does not generate electricity—it stores energy from external sources (e.g., grid, solar).
  • “Our technology just stores that electrical energy. So…[the] source can be any electrical source…we aim towards renewable energy sources like solar panels, wind turbines, tidal waves.” — Stefaniuk (06:22)

3. Integration with Renewable Energy and Buildings

• Direct Solar Charging Possibilities:

  • While the blocks themselves aren’t photovoltaic, they could integrate with thin-film solar panels affixed directly to walls, creating ultra-compact building-integrated storage solutions.

• Energy Density and Real-World Impact:

  • Tenfold improvement in energy storage density recently achieved:
    • “At this point, just around 5 cubic meters out of…80 in our residential house is sufficient to power residential needs of around 10 to 20 kilowatt hours. That’s a tremendous achievement.” — Stefaniuk (08:24)
    • Each cubic meter stores over 2 kWh (as of 2026).
  • In practice, this could make a well-sized house nearly energy-autonomous for typical daily needs (09:42).

4. Potential Applications – Beyond Just Energy Storage

• Self-Heating Concrete:
  • The technology also allows for self-heating applications—both in pavements for automatic snow/ice removal and for radiant floor heating in homes.
  • “Since concrete is electrically conductive, we leverage…electrical resistivity and Joule effect… So you can imagine that [airport runways, roads, or your home floor] could just…heat up.” — Stefaniuk (13:47)
  • Demonstrated in a real-world park in Japan.

5. Scalability and Timeline to Widespread Use

• Current Status:

  • Successful 1 m³ prototypes have been fabricated with up to 100 volts output in collaboration with Japanese industry.
  • “At this point we've tried to push this technology…from a lab bench…to a 1 meter cube prototype…So that was our recent objective, which was extremely successful.” — Stefaniuk (12:38)

• Biggest Challenges:

  • Not yet fully commercialized—needs further durability testing and optimization.
  • Biggest short-term barrier: lack of large data for AI/ML-led optimization and the need for long-term durability testing to align with conventional concrete’s ~50-year lifespan.
  • “Especially since we are using supercapacitor architecture and not a battery one, which means that…degradation over time is very minimal.” — Stefaniuk (16:42)

• Optimistic Timeline:

  • Self-heating applications anticipated “within the next few months.”
  • Energy–storing applications are only slightly behind, pending final tests and industrial validation (15:24).

6. Scientific and Public Resources

• Find updates via:
  • MIT Electron Conductive Carbon Concrete Hub (EC Cube)
  • LinkedIn: Damian Stefaniuk; MIT EC Cube Hub
  • MIT Concrete Sustainability Hub (CSHub)
  • Key scientific papers in PNAS (2023, 2025) — “where you can find…scientific foundations to prove scalability and the promise of this technology.” — Stefaniuk (17:28)

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Notable Quotes & Memorable Moments

• On the possibility of off-grid living:

  • “If you have solar panels that…charge your walls or concrete foundations…you won’t need to rely on energy from outside.” — Stefaniuk (10:38)

• On removing batteries from homes:

  • “You have to use regular batteries…hazardous…you have to replace them…So in this case, basically, you avoid them…” — Stefaniuk (11:42)

• On the wider impact for infrastructure and climate:

  • “Any concrete element, whether it’s a slab or highway blocks, can be converted to energy-storing components.” — Stefaniuk (13:47)

• Host's enthusiastic response:

  • “That’s really cool…When do you think these applications are going to be in widespread use?” — Richard Jacobs (15:15)

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Timestamps for Key Sections

• Making Concrete Conductive: 01:06–03:54
• Bulk Supercapacitor Design: 04:08–06:12
• Integration with Solar/Renewables: 06:22–09:38
• Self-Heating Applications: 13:47–14:59
• Scalability and Production Status: 12:38–17:21
• Public Resources and How to Learn More: 17:28–18:29

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Tone & Language

Scientific but accessible; Dr. Stefaniuk uses clear analogies ("bulk supercapacitor," "like ink ancient Egyptians made"), keeping technical details understandable, while Richard Jacobs guides the conversation with curiosity and practical "good questions"—fulfilling the podcast’s mission to spark further inquiry.

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Summary Takeaway

MIT’s conductive concrete is poised to transform the energy, construction, and sustainability landscape, enabling structures themselves to become robust, long-lasting energy storage units and self-heating surfaces, potentially eliminating the need for separate hazardous batteries in homes and helping smooth renewable energy usage. While some testing and scaling remain, the technology is moving rapidly towards real-world deployment, with heatable pavements expected soon and home energy-storing walls just behind.

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Transcript

[A]

You're listening to the Good Question podcast with Richard Jacobs. Our goal is to make each of our guests exclaim, hmm, that's a good question. I don't know the answer. Because when that happens, it means you, the listener, may be inspired to learn more beyond the interview and to ask great questions yourself that lead to new insights. In this podcast we cover historical and current anthropology, comparative religion and history. Welcome. And let's get started.

[B]

Hello, this is Richard Jacobs with the Good Question podcast. My guest today is Damian Stefaniok. He's going to talk about a new concrete battery that delivers 10 times the energy boost and turns buildings themselves into giant power bank, which I think is really cool. He's a research scientist at mit, Massachusetts Institute of Technology. So, you know, we'll go through that. So welcome Damien, thanks for coming.

[C]

Thank you. Thanks for having me, Richard.

[B]

Yeah. So, so how, how could this possibly work? And is, is concrete? I mean from what I understand, it's not conductive. You know, how, how does this battery work?

[C]

So basically first step to make it happen, we had to turn and make concrete conductive, electrically conductive. And usually you do it but by adding to the non conductive material some conductive phase that inter. Is interconnected. But what is also very important in our case, we use a special material, not that special because it's just a carbon product, car nanocarbon black. But not only it assembles in 3D connected networks due to its hydrophobicity, but also it has very high specific surface. So it can not only make the conductive, make concrete electrically conductive, but also accommodates the architecture of super capacitor. And that's, which is a, maybe a magic world, but, but it's essentially storing energy, electrical energy, like, like a battery.

[B]

How, how do you dope the, the, you know, without going into propri. Do you dope the concrete mixture so that when you pour it, it has the right alignment, the right shape, you know, it'll have the right properties that you want.

[C]

So at first we were creating nothing else but carbon ink and that the procedure was actually possible like 4.4, 600 years ago by Egyptian and Chinese ink, where they were basically adding Arabic gum polymer to disperse carbon black in water and then creating an ink. In our case, we just at first were using of course with more sophisticated chemicals we are using nowadays, but basically creating that dispersed carbon in water, we were adding to regular cementitious material and mixing it. That was our actually first approach, which we over time, over the last few years, we simplified it and currently we are mixing A dry mix of simple additives, which is cement powder, any aggregate and this nanocarbon black. And then after that just adding water. And as a result we are able to simplify and mix it as any regular, regular concrete, just with one additional dry ingredient.

[B]

We mix it well. It's. It's uniformly conductive.

[C]

Yes, the, the beauty of it is that that chemist chemical processes in this case are extremely repetitive, which means that no matter what mixing procedure we use, no matter who is going to be the user mixing it, and we obtain each time the same. That's actually the beauty of concrete that, that everyone around the world can in simple terms, of course, following certain procedures and avoiding certain mistakes, but using very simple repetitive process, we can, we can we actually shown that we obtain a very homogeneous dispersion of those carbon particles just due to its hydrophobic nature and hydrophilic nature of regular cementitious slurry.

[B]

Why not make the blocks conductive and then make the mortar less conductive or conductive in a different way. So the capacitance maybe occurs over the surface area of where the block meets the mortar. Would that be useful?

[C]

Actually, what is the beauty of our electron conducted carbon concrete technology ECQ is that our supercapacitor works of course on a specific surface, but of that carbon black within the pore space. As a result, our supercapacitor, we call it bulk supercapacitor because basically that internal porosity on a nanoscale level when the electrolyte infiltrates basically the specific surface comes from that internal space. So essentially it doesn't really matter whether our electrode is in a shape of a cube. It has more complicated structure because that essentially what really matters is the volume. Is the volume bit.

[B]

Oh. What happens at the end of a block when it meets the mortar then? Is that, is that like an area of different capacitance? Now you truly do have, you know, a gap of very different materials.

[C]

Yes, actually we in general, our ECQ technology is able to store electrical energy through architecture of supercapacitor. And not to get into very technical details, supercapacitor is composed of two electrodes, in our case our conductive concrete. And in the middle, in between there is a separator. That separator is basically can be treated as that actually mortar because it has to just be non conductive and porous, which mortar normally is. And as a result that single cell composed of two electrodes and separated by separator, that's our single supercapacitor cell that can, depending on the electrolyte, carry between 1, 2, 3, 4 volts. And then when we start connecting them in series or in parallel, that's how we can exceed those 14 volt limit. And connected basically cells. As you see the wall, where there are single bricks and in between there are mortar layers, there's nothing else but those kind of separators in between. And also current collectors on both sides, which basically structurally can deliver any, in theory any power or voltage depending on the volume and number of layers. In between these, as you mentioned, those

[B]

mortar joints, where does the, the power generation occur? You have the building sitting there. What, what, you know, how do you power up the blocks in the first place? How does it happen?

[C]

That's an excellent question because yes, some, sometimes our technology is confused with kind of technology that can deliver power. But yes, as you mentioned, properly our technology just stores that electrical energy. So we need it all. And that source can be any electrical source currently available. Usually we aim towards renewable energy source like solar panels, wind turbines, tidal waves. So whenever there is that intermittent energy supply, when let's say sun is available and delivering power, we use that energy, store it within our technology and then we can deliver it to any appliances whenever needed. During the night, or managing different peaks during the day and night, not only renewable energy can be, can be used for that. Any energy from the grid, if, if there is any additional supply in the grid or the energies at certain times of the day, more expensive, we can store that excessive amount and then distribute at other times to manage energy peaks.

[B]

What about the base of the block that sees the sun? Could you dope the surface of the block so that it could, it could be a little solar cell in itself, then the energy doesn't have to go anywhere and it goes right into the block matrix to restore it.

[C]

Our technology itself at this point should not do it. But there are other technologies which basically they create those very thin films of solar panels which are kind of glued to facades of the building. And basically then you have direct input of solar energy through those thin films attached to the concrete wall, which can directly power those, those walls and distribute energy further.

[B]

Yeah, maybe that's a good thing because you're, the capacitance is happening right there in the block. If you married, you know, thin films, you could pick up. I don't know, I don't know how much you could pick up, but maybe they would be, would there be enough, you think, like maybe doing calculations, see if it would make a, a material difference in how much energy you could store just from the sun alone. On the building.

[C]

Yes, definitely. Because the beauty of ECQ technology is that it scales linearly with the volume. And even though the energy density which we can store is relatively low compared to traditional batteries, when we imagine how much volume of concrete we use worldwide and in our structures, those tremendous volumes can really store significant amounts. In our current, let's say one year ago, I would say if you imagine a residential house as the most, the simplest example, and the residential house has around 60 to 80 meter cube of concrete and just half of it one year ago was was sufficient to meet the daily residential need of that house. At this stage, when we were able to boost the energy density by a factor of 10 due to application of more advanced mixing technologies and organic electrolytes. At this point, just around 5 meter cubed out of those 80 in our residential house is sufficient to power residential needs of around 10 to 20 kilowatt hours. That's a tremendous achievement. And as a result, yes, that could store enough energy from those solar panels on your roof or on the facade through those thin films you mentioned for a house.

[B]

How much could this store? Like the equivalent of one day's use or how much could it store?

[C]

At current level we can store more than 2 kilowatt hour per cubic meter. So if you, let's say would like to store 10 to 20, 20 kilowatt hour, which is daily residential need across United States and Europe and so on, that's around, as I mentioned, 5 to 10 cubic meters of concrete.

[B]

Well, I'm saying a house, let's say it's 30. It will be like a decent sized house, like a three bedroom, you know, here would be maybe 1500 square feet which would be what? Like it's like 30, 30 square meters or something. Or 20 square meters.

[C]

Yes, the estimate is around 30 to 8080 cubic meters of concrete for a residential house.

[B]

And how much would that. So I guess it would make power needs intermittent. Or what would it do? Like would you, would you run the power and then turn it off because you have enough and then run off the battery, the capacitance and then turn it back on to refill it. Or like what would the energy, the pattern of energy usage look like?

[C]

The standard energy pattern would be like if you imagine off grid house, so you do not have to even connect your house to the grid. If you have solar panels that during the day can both slowly charge you your super, your walls and or concrete foundations and slabs, anything which is concrete. And then you would during the day use that solar energy for your appliances at the same time, charge your, charge your concrete elements and then whenever the sun is gone during the night or cloudy days, then you can retrieve that energy stored in those construction elements. And as a result you won't need to rely on energy from outside.

[B]

Oh, so you could be totally self sufficient?

[C]

Yes, definitely.

[B]

Hmm. How much? How much? Like if someone already has solar, I mean they're, I know they try not to undersize them, but how much does this help? Like could I get away with half capacity solar because you know, long as my house is big enough, this will be, this will add the rest. Or do I have to like how much, how much would it offset my need for solar or my need for, you know, for electricity if I don't use solar?

[C]

Frankly speaking, that offset on the solar panels wouldn't be much because you still, you would have to get that energy from solar. But the advantage is that overnight, when normally you would still have to get the energy from the grid and pay for that, then you wouldn't have to, you would basically use that energy that you store. Because at this point you either have to use regular batteries, let's say different types of batteries that you can store in your garage that are compatible with your solar panels, but those are hazardous. You have to replace them every 10, 15 years and you have to pay for them. So in this case, basically you avoid them. Especially that, let's say in California, if I remember correctly. Basically if you install solar panels, you need those also energy storage system. Otherwise it's hard to manage high energy discrepancy during the night and day. If everyone would use, let's say solar panels.

[B]

Okay, gotcha. So is this in production?

[C]

Unfortunately not yet. At this point. At this point we've tried to push this technology to at first on a lab bench and then we got into collaboration with consortium of companies led by Aizawa in Japan, where basically we are able to produce over the last few months a 1 meter cube prototype and composed of four columns that can reach up to 100 volts. So that was our recent objective, which was extremely successful. And then day by day also we try to adapt this technology to, with those collaboration, outside collaboration, industrial collaborations to push it forward. But still we need a small amount of time to basically be able to manufacture it at scale and make sure that, that all aspects of this technology like durability, safety are met and approved for those manufacturing purposes.

[B]

What about the slab or slab built house ends up being a piece of concrete. You guys tried doping that to see if you make the entire sl Slab conductive because it's also in contact directly with ground. The ground?

[C]

Yes, yes. Basically any concrete element, whether it's a slab around your house or concrete blocks on the highway, can be converted to energy storing components. But on top of that, our technology can also be used for self heating application which actually greatly applies to the one you mentioned. Because if you imagine every winter whenever we have snow and ice, we have to deal with that. It creates risks and imposes us to. To put a lot of salt for the icing. But that's usually still creates safety issues and so on. So our technology can basically since it's concrete is electrically conductive, we leverage the fact that through that electrical resistivity and joule effect we can heat up that concrete sludge. So as a result, one year ago we were able to demonstrate a few meter long pavement in Odori park in Japan. And with that functionality and it worked very well. So you can imagine that let's say in the airport runways you wouldn't have to de ice or the snow. The airport runways you could just in

[B]

your own home you could do radiant heating from the floor if it's worked, you know.

[C]

Yes, exactly. Because currently mostly for radiant floor heating you have to install water pipes. The installation is very expensive. You have water issues because the leakagements are on and here just your floor can heat up or your wall. So for rating for heating is also extremely, extremely useful.

[B]

Yeah, that's really cool. When do you think some of these applications are going to be in widespread use? Like how long and what's blocking them from getting there?

[C]

We are very optimistic. So we think that within the next few months with industrial collaborations we can push this technology at least that self heating application must might be a bit quicker just because it's a little bit simpler. While for energy storing applications that that application is a bit, just slightly I would say more complex and I would say what is missing. I would say first to like optimization of this material because in our, let's say in our other, some other technologies we, we have so much data set and that information that we can use AI machine learning and optimize the systems. But in our case this is kind of new technology and limited just just few years that we've been working on it. So at this point all those machine learning algorithms, they don't have enough data to, to, to optimize them fully. Nevertheless, I think it's just a matter of months that we can push this technology forward and just make sure to run some remaining tests for those durability durability tests to prove that, you know, if, if we design our concrete structures for currently, for sustainability structures for more than 50 years, we just want to make sure that we won't build those structural elements and concrete elements and that energy storing functionality or self healing functionality won't kind of degrade much quicker than that. The goal and the promise is to keep these both functionalities at the same time. Especially since we are using supercapacitor architecture and not a battery one, which means that basically we do not have any chemical processes while charging and discharging our material. And as a result now our supercapacitor architecture, usually the gradation over time is very minimal. So that creates that promise that those that both functionalities can last together.

[B]

Right. You live together and it lasts long. All right, okay, well, very good, Damian. Where, where can people find out more about your work and follow you?

[C]

So we, we are have currently MIT Electron Conductive Carbon Concrete Hub. So so MIT EC Cube Hub has a website where we try to post any news, any newsletters. Also we are present on LinkedIn. You can follow me through LinkedIn, Damien Stefaniuk or our hubs, MIT EC Cube Hub. We are also sharing part of the work through MIT Concrete Sustainability Hub that has been with MIT for the last more than 15 years. And we have also MIT CShub has YouTube channel and of course what we also Recommend. We have two PNAS papers, one 2023 and the last one 2025 when where you can find basically foundations, scientific foundations to prove the scalability and the promise of this technology. So I think all of these can give kind of a hint where we are at and where are we going towards.

[B]

Okay, well, very good. Well Damien, thanks so much for coming on the podcast. I appreciate it. Thank you so much Richard.

[C]

One more time for having me.

[B]

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[A]

Thank you for listening to the Good Question podcast. Please email supporthegoodquestionpodcast.com if you have any referrals to great guests for us to interview, visit thegoodquestionpodcast.com to hear more interviews. And please help us spread the word by rating and reviewing us on Apple podcasts, iTunes, Spotify, YouTube or wherever you listen to this podcast.