# Energy storage startup financing

> Live situation record from CLSTR: https://clstr.news/situations/energy-storage-startup-financing
> Updated: 2026-08-04T09:00:01.000Z. Sources: 10. Developments: 2.

In late July 2026, Antora Energy of San Jose closed a $550 million Series C round to fund a second U.S. manufacturing plant and expand production of solid‑carbon heat‑storage blocks for long‑duration thermal storage in data centres, steelmaking and other high‑energy‑use sectors.

In early August 2026, Dutch startup Ore Energy announced a $43 million Series A financing, bringing its total funding to $61 million. The round was led by Plural and HV Capital with participation from Positron Ventures. The capital will be used to build Ore Energy’s first European manufacturing plant and to reach gigawatt‑hour‑scale production by 2028. The company has completed pilot projects at Delft’s Green Village and EDF’s Lab les Renardières in France and signed a 1 GWh off‑take agreement with Budget Thuis, with an initial 400 MWh delivery planned for 2028. Both firms are pursuing large‑scale, multi‑day storage solutions to enable deeper renewable integration for grids, AI data‑centers and industrial facilities.

## Claims

- Ore Energy raised $43 million in a Series A funding round. (corroborated by 4 sources)
- The Series A round was led by Plural and HV Capital, with participation from Positron Ventures. (corroborated by 4 sources)
- Ore Energy plans to build its first manufacturing facility and achieve gigawatt‑hour‑scale production by 2028. (corroborated by 4 sources)
- Iron‑air batteries can store renewable electricity for up to 100 hours. (corroborated by 4 sources)
- The batteries use only iron, water and air, avoiding lithium and cobalt. (corroborated by 4 sources)
- Ore Energy signed a 1 GWh off‑take agreement with Dutch utility Budget Thuis, with an initial 400 MWh delivery slated for 2028. (corroborated by 4 sources)
- Pilot projects were completed at Delft’s Green Village and at EDF Lab les Renardières in France. (corroborated by 4 sources)
- Ore Energy's total funding reached $61 million after the round. (corroborated by 2 sources)

## Timeline

### 2026-08-04: Ore Energy secures $43 million Series A to scale iron‑air batteries

Amsterdam‑based Ore Energy raised $43 million in a Series A round led by Plural and HV Capital to scale iron‑air batteries that store renewable power for up to 100 hours, with plans for a European factory and G

4 sources. https://clstr.news/cluster/dutch-energy-storage-startup-ore-energy-secures-43-million-series-a-funding

### 2026-07-31: Antora Energy secures $550 million to scale heat‑battery production

Antora Energy raised $550 million in a Series C round to expand its heat‑battery technology, targeting decarbonisation of data centres and heavy industry.

7 sources. https://clstr.news/cluster/antora-energy-secures-550-million-to-scale-heatbattery-production

---
Cite as: Energy storage startup financing. CLSTR, https://clstr.news/situations/energy-storage-startup-financing