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MIT has demonstrated cement-based supercapacitors that could eventually be integrated into foundations, walls, roads, and other structures. But this is not ordinary concrete, not a commercially available “energy cement” product, and not a home foundation you can order today.
The research has advanced significantly: MIT’s 2023 concept estimated that about 45 cubic meters of material could store roughly 10 kilowatt-hours (kWh), while an improved version reported in 2025 reduced the comparable theoretical volume to about 5 cubic meters. That is an important research improvement—but it remains a laboratory-stage construction technology rather than a replacement for a residential battery.
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What MIT actually created
MIT researchers developed a cement-based material that can store electrical energy. The material combines cement, water, ultra-fine conductive carbon black, an electrolyte, and the electrodes and separators needed to assemble an electrical storage device.
The technically accurate name is a carbon-cement supercapacitor. MIT’s newer research program refers to the material as electron-conducting carbon concrete, or ec³.
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“Concrete battery” is useful media shorthand, but it can mislead. A normal concrete slab, basement wall, or foundation does not automatically store electricity. The concrete must be specially engineered, electrically connected, and configured as a capacitor.
MIT’s research program is described at the MIT ec³ Hub, and a related synthesis method is listed by the MIT Technology Licensing Office as available for licensing. Those facts do not establish that a homeowner-ready, code-approved ec³ foundation is commercially available.
How can concrete store electricity?
The key is internal surface area.
When cement reacts with water, it forms a porous structure. Carbon black dispersed through the cement creates an interconnected nanoscale conductive network inside that structure. This network has a very large effective surface area.
In a capacitor, electrical charge is stored on conductive surfaces separated by an insulating material. In MIT’s material, the carbon network acts as a conductive structure, while the electrolyte supplies mobile ions. With the appropriate electrodes, separators, and electrical connections, the composite can store and release energy electrostatically.
A supercapacitor is a capacitor designed to achieve much higher capacitance than a conventional capacitor. It can generally charge and discharge rapidly and deliver high power, but it does not behave exactly like a lithium-ion battery.
The basic distinction is:
| Term | What it means |
|---|---|
| Battery | Stores energy primarily through chemical reactions and typically provides a relatively stable voltage during discharge. |
| Capacitor | Stores energy electrostatically on separated conductive surfaces. |
| Supercapacitor | A high-capacitance capacitor designed for rapid charging and discharging. |
| “Concrete battery” | Media shorthand for a cement-based supercapacitor or structural energy-storage system. |
The 2023 research paper and its open-access version describe the carbon network and storage mechanism in detail: PNAS research paper and open-access article.
The headline numbers: 45 cubic meters versus 5
MIT’s first widely reported demonstration, announced in July 2023, estimated that approximately 45 cubic meters of carbon-cement supercapacitor material could store about 10 kWh of energy. MIT compared that amount with the approximate average daily electricity use of a household.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11In October 2025, MIT reported an improved version using different electrolytes and manufacturing methods. The university said that the same broad 10-kWh household-scale comparison could theoretically require about 5 cubic meters of material instead of 45 cubic meters.
That is roughly an order-of-magnitude improvement in the reported energy-storage capacity. Based on MIT’s stated comparison, the improved material represents more than 2 kWh per cubic meter.
These figures should not be treated as a guaranteed usable capacity for a completed house. The practical result would depend on:
- the exact cement and carbon composition;
- electrolyte and separator design;
- the arrangement of electrodes and capacitor sections;
- usable depth of discharge;
- conversion and wiring losses;
- temperature and moisture conditions;
- structural requirements; and
- the power electronics connected to the structure.
The 10-kWh comparison is also not a universal definition of a day’s electricity. A small, efficient home may use much less, while a home with electric heating, central air conditioning, electric water heating, or an electric vehicle may use substantially more.
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Energy capacity is not the same as power
A frequent problem with coverage of the 2025 announcement is the loose use of “power.” Energy is measured in kilowatt-hours and describes how much electricity is stored. Power is measured in kilowatts and describes how quickly the system can deliver electricity.
A structure could theoretically contain 10 kWh but still require substantial engineering to run a refrigerator, heat pump, well pump, air conditioner, electric range, or other high-demand appliance. The system would need suitable conductors, converters, controls, and an inverter capable of delivering the required voltage and current.
What researchers demonstrated—and what they did not
MIT’s 2023 work demonstrated small cement-carbon supercapacitor cells. Researchers connected cells and used them to power an LED. That showed the material could store and release electricity, but it did not demonstrate a residential energy system.
The 2025 work reported several larger or more integrated demonstrations, including:
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- a 12-volt prototype capable of powering a computer fan and a small video-game console through USB;
- a miniature arch combining structural load-bearing and supercapacitor functions; and
- an LED whose behavior changed with applied load, illustrating the possibility of using electrical behavior for structural-health monitoring.
The arch is significant because it demonstrates the idea of multifunctional concrete: one construction material could contribute to structural performance while also storing energy or providing sensing functions.
However, the demonstrations do not show that MIT has powered a real house with an ec³ foundation. They do not establish residential building-code approval, decades of field durability, a retail installation service, or a finished home-energy product.
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Read MIT’s accounts of the demonstrations here: the 2023 announcement and the 2025 update.
How could an energy-storing house work?
The concrete would not generate electricity. It would store electricity supplied by solar panels, the grid, or another generator.
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A future system might look like this:
Solar panels → charge electronics → carbon-cement storage sections → inverter and energy-management system → household circuits
A practical building-integrated system would also need:
- purpose-designed conductive concrete sections;
- electrodes, separators, electrolyte containment, and embedded wiring;
- charge-management and balancing electronics;
- DC/DC converters or an inverter for household AC power;
- protection against overvoltage, short circuits, moisture, and physical damage;
- monitoring and fault detection;
- a home energy-management system;
- automatic grid isolation during an outage;
- structural and electrical inspections; and
- maintenance and replacement procedures.
For a grid-connected home, the system would need to disconnect safely from the utility during an outage. A foundation cannot simply be wired into household circuits without the same kind of electrical protection, controls, and approvals required of other energy-storage equipment.
Why builders may eventually care
The strongest argument for energy-storing concrete is not compactness. Conventional lithium-ion batteries store far more energy in a much smaller volume. The possible advantage of ec³ is dual use: a wall, road, parking area, foundation, or bridge component could potentially provide structural or civil-engineering functions while also storing electricity.
Potential applications include:
- energy-storing structural elements in new buildings;
- parking areas or road sections that store electricity or support charging infrastructure;
- short-duration energy buffering;
- high-power charging or regenerative-energy applications;
- structural-health monitoring through electrical measurements; and
- infrastructure where a separate battery enclosure would be difficult to provide.
MIT has also discussed conductive concrete and related infrastructure applications through its Concrete Sustainability Hub and its five-year industry research agreement with Aizawa Concrete.
These are potential advantages, not established commercial benefits. A building project would still need to prove that the material meets its structural, electrical, durability, cost, and safety requirements.
The main engineering obstacles
1. Low energy density compared with ordinary batteries
Even the improved research result is very low in volumetric energy density compared with a practical lithium-ion battery pack. Its value would come from using construction volume that is already required—not from storing large amounts of energy in a small space.
That makes the technology a poor substitute for a homeowner seeking a compact, removable, upgradeable battery appliance.
2. Structural strength may conflict with storage capacity
MIT’s 2023 report described a trade-off: adding more carbon black can improve electrical storage performance but may reduce concrete strength. A mix suitable for a nonstructural wall, pavement element, or architectural block may not be suitable for a heavily loaded foundation, column, retaining wall, or seismic structure.
Every application would need a mix design that satisfies both electrical and structural requirements. The highest-capacity formulation may not be the safest or most economical formulation for a building.
3. Electrolyte containment and moisture exposure
The electrolyte is essential to the supercapacitor, but buildings must also withstand water ingress, drying, freeze-thaw cycles, cracking, corrosion, and decades of environmental exposure.
Laboratory performance is not the same as long-term performance inside a foundation or outdoor structure. The cited MIT research does not establish a decades-long residential durability record.
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A conventional home battery can generally be serviced or replaced without demolishing the foundation. If embedded electrodes, wiring, or electrolyte systems fail inside a structural element, access could be difficult or impossible.
This is a lifecycle and design concern, not a documented failure from residential deployments. It is one reason that modular construction and accessible electrical connections would matter in any future commercial system.
5. Power electronics do not disappear
The concrete would not directly deliver the household’s required AC voltage. It would need electrical connections, control equipment, balancing, converters, protection, and an inverter. Those components add cost, complexity, failure points, and code requirements.
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6. Concrete is not automatically low-carbon
Cement production is emissions-intensive. Adding energy-storage capability does not by itself eliminate the carbon footprint of cement manufacture.
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7. The economics are unknown
The 2023 MIT announcement suggested that the material might eventually add little or no cost to a foundation, but that was a projection—not a current retail price or completed construction estimate.
A real cost model would need to include the specialized mix, carbon black, electrolyte and separators, electrodes, wiring, sensors, controls, engineering, testing, certification, installation, maintenance, and eventual replacement or demolition.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Could you use this in a new house today?
Not as an ordinary residential product based on the cited evidence.
New construction is the most plausible path because electrodes, wiring, capacitor sections, waterproofing, structural calculations, and electrical equipment could be designed together from the beginning. Retrofitting an existing foundation or wall would be impractical in most homes.
Early applications may be more realistic in nonstructural or lightly loaded elements, demonstration buildings, parking areas, roads, or infrastructure where designers can test the material without making it the sole support for a home.
Before an energy-storing structural element could be specified for a house, engineers and regulators would need evidence covering:
- load-bearing strength and fire performance;
- crack tolerance and freeze-thaw durability;
- electrolyte stability and containment;
- electrode corrosion;
- electrical isolation and fault protection;
- capacity retention over time;
- repairability and inspection;
- building-code compliance;
- utility interconnection; and
- safe demolition and disposal.
What homeowners can buy now
If the goal is backup power today, a certified residential battery or modular whole-home power system is the practical route—not an MIT cement foundation.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteFor example, Tesla’s Powerwall order process is designed around a manufactured home-energy product, while the EcoFlow DELTA Pro Ultra is a modular power-station system that can be configured for larger backup applications. These products are separate from MIT’s research material and should be evaluated on their own capacity, power output, installation requirements, warranty, safety certifications, and local permitting rules.
When comparing any home-storage system, check:
- usable capacity in kWh, not just nominal capacity;
- continuous and peak power in kW;
- which circuits it can support during an outage;
- whether it can start motors, pumps, air conditioners, or heat pumps;
- solar and inverter compatibility;
- indoor or outdoor installation requirements;
- local utility and permitting rules;
- warranty and cycle-life terms;
- serviceability and replacement options; and
- whether capacity can be expanded later.
Can MIT’s energy cement replace lithium-ion batteries?
The research does not support that conclusion. Supercapacitors and lithium-ion batteries serve different purposes.
Supercapacitors can be attractive for rapid charging, high-power bursts, voltage smoothing, regenerative-energy capture, and applications where integrating storage into a large structure has value. Lithium-ion batteries remain far more practical when a homeowner needs compact, high-energy, long-duration storage in a serviceable package.
The more defensible future is not necessarily replacement. Structural supercapacitors could complement conventional batteries in buildings or infrastructure where available volume and multifunctionality outweigh the disadvantages of low energy density and difficult maintenance.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsSo, are homes becoming giant batteries?
Not yet. MIT has demonstrated a credible way to make specially engineered cement function as a supercapacitor, and the 2025 version substantially improved the reported energy-storage capacity. The work could eventually lead to foundations, walls, roads, or other structures that perform both construction and energy-storage functions.
But a real “battery house” would require much more than conductive concrete. It would need engineered capacitor sections, electrodes, electrolyte containment, wiring, inverters, controls, protection, inspections, code approval, long-term durability evidence, and a viable maintenance plan.
For construction professionals, the important idea is multifunctional infrastructure, not a miracle battery hidden in ordinary concrete. For homeowners who need backup power now, a conventional certified battery remains the practical choice.
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