How do iron-air batteries compare to lithium-ion batteries?

Iron-air batteries are designed for much longer discharge durations, capable of storing energy for up to 100 hours, compared to the typical 2-8 hours for lithium-ion batteries. They also claim a significantly lower cost per unit of capacity, about one-tenth that of lithium-ion, primarily because they use inexpensive and widely available materials like iron instead of critical minerals such as lithium, cobalt, and nickel. However, lithium-ion batteries generally have higher power density, making them more suitable for applications requiring rapid bursts of power or compact size, like electric vehicles or consumer electronics.

Why is long-duration energy storage important for renewable energy?

Renewable energy sources like solar and wind are intermittent, meaning they only generate power when conditions are right. Long-duration energy storage is crucial because it allows excess renewable electricity generated during peak production times (e.g., sunny afternoons) to be stored and then discharged when demand is high or generation is low (e.g., at night or on cloudy, windless days). This capability helps to stabilize the grid, reduce reliance on fossil fuel 'peaker plants,' and ensure a continuous supply of clean energy, ultimately enabling a more robust and fully renewable energy system.

What role do these batteries play in the 'AI Era'?

The rapid expansion of artificial intelligence (AI) data centers is driving a massive increase in electricity demand. These data centers require constant, reliable power. Without long-duration storage solutions for renewable energy, the growing energy needs of AI could lead to increased reliance on fossil fuels. Iron-air batteries, by providing stable, multi-day storage for renewable power, could help ensure that the growth of AI is powered by clean energy, supporting both technological advancement and climate goals.

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techAugust 5, 2026By Veridact EditorialUpdated Aug 5

Ore Energy Secures $43 Million to Scale Iron-Air Batteries for the AI Era's Energy Demands

Amsterdam-based startup Ore Energy has secured $43 million in Series A funding, bringing its total capital raised to $61 million. The investment, led by Plural and HV Capital, is earmarked to accelerate the development and manufacturing of its iron-air battery technology. Ore Energy's batteries are designed for long-duration energy storage, capable of holding renewable electricity for up to 100 hours, and are touted as a significantly cheaper alternative to traditional lithium-ion systems. The company aims to scale production by 2028, positioning its technology as a crucial enabler for stable, renewable baseload power, particularly as electricity demand from artificial intelligence (AI) data centers and manufacturing expands.

Outlook

The $43 million Series A funding for Ore Energy is expected to significantly boost the company's efforts to move its iron-air battery technology from pilot projects toward commercial deployment. The immediate focus will be on establishing a manufacturing facility, a critical step toward scaling production volume. Over the next two years, the industry will be watching closely for progress on this front, particularly how effectively Ore Energy can transition its technology from lab to large-scale grid integration. Success would mean a viable, cost-effective alternative for multi-day energy storage, which could begin to alleviate some of the intermittency challenges inherent in renewable energy sources like solar and wind. The market will also be observing whether Ore Energy can maintain its claimed cost advantage over lithium-ion batteries as it scales, and how it addresses the logistical and operational complexities of deploying a novel battery chemistry across diverse grid environments.

Background

The global energy transition hinges on solving the intermittency of renewable power. Solar panels only generate electricity when the sun shines, and wind turbines only when the wind blows. This creates a fundamental challenge for maintaining a stable power grid, which traditionally relies on always-on, dispatchable sources like fossil fuel plants. For years, lithium-ion batteries have dominated the short-duration storage market, typically providing power for a few hours. However, their cost and material limitations make them less suitable for storing energy for multiple days – the 'long-duration' storage problem. This gap is precisely where technologies like iron-air batteries aim to fit. Iron-air batteries use abundant, inexpensive materials like iron, water, and air, reacting to store and release energy. They essentially 'rust' and 'de-rust' to generate electricity. This approach sidesteps the supply chain bottlenecks and high costs associated with materials like cobalt, nickel, and lithium found in conventional batteries. The timing of Ore Energy's funding also coincides with an unprecedented surge in electricity demand driven by the rapid expansion of AI data centers, which require massive, continuous power. This new demand layer adds urgency to finding reliable, sustainable baseload power solutions beyond traditional fossil fuels.

Precedents

The history of energy storage is littered with promising technologies that struggled to reach commercial scale. From various flow batteries to molten salt systems, many have faced challenges related to cost, efficiency, cycle life, or manufacturing complexity. The journey from lab prototype to grid-scale deployment is often long and capital-intensive, requiring not just technical validation but also robust supply chains, rigorous safety standards, and integration into existing grid infrastructure. Investors have historically been cautious with novel battery chemistries, often preferring incremental improvements to established technologies. However, the current energy transition and the growing demand for stable, renewable power have created a renewed appetite for risk in the long-duration storage sector. Companies like Form Energy, which also develops iron-air batteries, have attracted significant investment, indicating a broader market shift. The pattern suggests that while the path is difficult, breakthroughs are possible, particularly when a technology offers a clear advantage in cost, duration, and material sourcing, as Ore Energy claims to do. The success of any new battery technology often depends less on its initial scientific proof and more on its ability to be manufactured affordably at scale and integrated reliably into complex energy systems.

Ore Energy's successful funding round matters because it represents a significant vote of confidence in a specific category of long-duration energy storage that could fundamentally alter the economics and reliability of renewable energy. If iron-air batteries can indeed deliver 100 hours of storage at a fraction of the cost of lithium-ion, it changes the calculus for grid operators and developers of renewable projects. This technology could make it feasible to store excess solar and wind power for several days, bridging periods of low generation and effectively turning intermittent renewables into a reliable, 'baseload' power source. This would directly reduce the need for natural gas peaker plants, which currently fill these gaps, leading to lower carbon emissions and potentially more stable electricity prices. Beyond environmental benefits, the ability to provide multi-day storage is becoming critical for energy-intensive sectors like AI. The vast server farms powering AI models demand constant, reliable electricity. Without long-duration storage, the growth of AI could become heavily reliant on fossil fuels, undermining broader decarbonization efforts. Ore Energy’s approach, using abundant and inexpensive materials, also offers a pathway to greater energy security, reducing reliance on complex global supply chains for critical minerals. In essence, this investment is not just about a startup; it's about pushing forward a solution that could unlock the next phase of the energy transition and underpin the sustainable growth of emerging technologies.

Scenarios

Analysis

One potential outcome is that Ore Energy successfully scales its manufacturing and deploys its iron-air batteries in pilot projects across Europe, proving their economic and technical viability at a larger scale. This could lead to further investment rounds and accelerate the adoption of long-duration storage solutions, potentially displacing some natural gas capacity and reducing carbon emissions from the grid.

Another possibility is that while the technology proves effective, Ore Energy encounters significant hurdles in scaling production efficiently or integrating into diverse grid infrastructures. Manufacturing complex battery systems at a competitive cost is notoriously difficult, and unforeseen technical challenges or supply chain bottlenecks could slow deployment, requiring more time and capital than currently anticipated. Regulatory frameworks and market incentives for long-duration storage are also still evolving, which could impact the pace of adoption.

A third outcome could see Ore Energy's technology becoming a niche solution, perhaps ideal for specific industrial applications or remote microgrids, but struggling to achieve widespread utility-scale deployment against established or emerging competitors. The long-duration storage market is attracting numerous innovators with diverse chemistries, and the race to achieve cost-effectiveness and scalability is intense. Ore Energy's success will depend on its ability to execute on its manufacturing plans and demonstrate clear advantages over these competing technologies in real-world conditions.

Timeline

2026-08-04

Series A Funding Announcement

Ore Energy announced it secured $43 million in Series A funding from Plural and HV Capital, bringing its total capital raised to $61 million. The funding is aimed at commercializing its iron-air battery technology.

2028-12-31

Target for Production Scaling

Ore Energy has set a target to scale its iron-air battery production by 2028, which would involve establishing a new manufacturing facility to meet growing demand.

Frequently Asked Questions

Iron-air batteries are a type of electrochemical battery that uses iron, water, and air to store and release electrical energy. They work by oxidizing iron (essentially rusting it) to generate electricity and then reversing the process to recharge the battery. This chemistry allows for long-duration storage, typically many hours or even days, using abundant and low-cost materials.

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