Lithium-ion wins hours. Grids fail on days. Amsterdam-based Ore Energy raised $43 million Series A on August 4, 2026 (Plural and HV Capital leading; Positron Ventures in) to manufacture iron-air batteries that store power for up to ~100 hours. Total raised: ~$61 million.

Deal snapshot

Who uses the product

Buyers are utilities and energy retailers, not consumers:

• Budget Thuis (Dutch supplier) — up to 1 GWh iron-air deployment; 400 MWh phase one targeted for 2028 (company-described as continental Europe’s largest iron-air agreement).
• EDF — grid-connected pilot in France under real utility conditions (up to four days of storage demonstrated in the 2025 test window).

Systems ship as modular containers daisy-chained for capacity. Chemistry: oxidize/deoxidize iron electrodes (“rust and unrust”) using abundant materials — iron, water, air.

Why now

AI data centers, re-industrialization, and renewable penetration collide on the same constraint: firm, affordable electrons. Lithium covers short peaks; multi-day lulls still pull fossil peakers. Ore’s raise lands the same week as other AI-infra checks — storage is becoming part of the AI capex stack, not a separate climate niche.

Investor fit (honest scope)

Plural and HV Capital are European early-stage / growth firms (not yet profiled as separate entities in our U.S.-heavy directory). The round still maps to climate-tech checkbooks like Energy Impact Partners and Energy Transition Ventures in category — long-duration storage for grids — even though they are not disclosed participants here.

Likely reasons Ore took Plural + HV:

1. European industrial policy alignment (local supply chain story).
2. Manufacturing capital before 2028 delivery dates.
3. Climate-deep networks for utility procurement.

Competitive map

When not to overclaim

• Round-trip efficiency lags lithium — bulk and land use can kill siting.
• 2028 delivery slips turn LOIs into stranded narrative.
• Policy subsidies, not physics, may decide winners.

Practical takeaway

Operators / utilities: Diligence $/kWh-capacity, duration, and local content — not just chemistry novelty.
Investors: Iron-air is a manufacturing race; the Series A only buys a factory option.

Sources

1. Energy-Storage.News: https://www.energy-storage.news/european-multi-day-energy-storage-startup-ore-energy-raises-us43-million-in-series-a/
2. The Next Web: https://thenextweb.com/news/ore-energy-43m-iron-air-battery-series-a
3. Tech.eu: https://tech.eu/2026/08/04/multi-day-energy-startup-ore-energy-clinches-43m-in-new-investment-round/
4. Electrek: https://electrek.co/2026/08/04/europe-is-betting-big-on-a-battery-that-runs-for-four-days/