100-hour iron-based storage system connects to a regional grid
A multi-day storage installation using iron chemistry begins supplying a utility under a capacity arrangement.
Source: Huburb demo record · no external source attached
EnergyMaturity: Early
Long-Duration Storage
Storage that discharges for ten hours or more — iron-air, flow batteries, thermal and mechanical systems — as opposed to the four-hour lithium standard.
Why does it matter?
Grids with heavy wind and solar have multi-day gaps that short-duration batteries cannot cover. Long-duration storage is what lets renewables supply firm power instead of needing gas backup.
How does it work?
Energy is stored chemically, thermally or mechanically in cheap, abundant materials, trading round-trip efficiency for very low cost per stored kilowatt-hour.
Where is it today?
Multiple pilot and early commercial projects are connected to grids. Cost curves and cycle life over decades remain to be demonstrated.
Applications
- · Grid firming
- · Industrial load shifting
- · Microgrids
Key challenges
- · Round-trip efficiency
- · Cycle life
- · Market rules that reward duration
Advantages
- · Cheap materials
- · Multi-day discharge
- · Siting flexibility
Infrastructure required
Grid interconnection and capacity market participation.