Image: Kecko ( CC BY 2.0 )
What it is
On 17 March 2026 Form Energy and FuturEnergy Ireland announced an agreement to deploy a 10 MW / 1,000 MWh (1 GWh) iron-air system in the northwest of Ireland: Form’s first announced international project, anticipated online in 2029. Coverage names the Ballynahone Energy Storage site in County Donegal. One hundred hours at 10 MW is the arithmetic of 1 GWh. This is a contracted demonstration, not a running Irish battery.
Problem it targets
Ireland’s wind-heavy grid curtails power when the island cannot use or export it, then burns something else when the wind drops for days. Multi-day storage is the stated gap.
How it works
The same iron-air chemistry as Form’s U.S. projects: reversible rusting of iron, abundant materials, large footprint. Planning and grid connection still sit in front of any electron.
Status and players
Form Energy; FuturEnergy Ireland. Neighbor card: the much larger Google-Xcel 300 MW / 30 GWh U.S. filing.
Risks and limits
Planning appeals, interconnection, and whether 2029 holds. Ten megawatts will not rewrite an island grid. Do not count an agreement as delivered megawatt-hours.
Sources
Form Energy 17 March 2026 Ireland note: 10 MW / 1 GWh, online anticipated 2029. An agreement is not a running battery.