ROUNDUP: Non-Lithium Energy Storage System Technology Advances in US, Spain, and Scotland

Why It Matters

Longer‑lasting, domestically sourced storage reduces replacement costs and financing risk, accelerating renewable integration and grid resilience worldwide.

Key Takeaways

• Unigrid’s Na‑ion cells achieve 5,000 cycles, 95% retention
• Projected 20,000 cycles give up to 25‑year battery life
• Inlyte partners Ervin to source domestic iron for SMC batteries
• CIUDEN tests 1 MW/8 MWh VRFB, part of 15 MWh storage hub
• Sunamp Mini stores 80 kWh heat, cuts CO₂ in one year

Pulse Analysis

Sodium‑ion technology is emerging as a credible alternative to lithium, driven by Unigrid’s breakthrough NCO chemistry that delivers 5,000 full‑depth cycles with over 95% capacity retention. By aligning battery longevity with the typical 25‑year life of solar PV modules, developers can adopt battery‑as‑a‑service models and lock in predictable O&M costs, a shift that could reshape financing structures for utility‑scale solar projects across the United States.

Inlyte Energy’s collaboration with Ervin Industries underscores a strategic push for a fully domestic supply chain in the United States. Leveraging recycled iron powders for its iron‑sodium (ZEBRA) batteries not only taps existing metal‑working infrastructure but also mitigates geopolitical risks associated with overseas raw material sourcing. With a pilot deployment slated for 2027 and a production facility planned for 2026, the move signals growing confidence in non‑lithium chemistries to meet the country’s long‑duration storage needs.

Europe and the UK are also diversifying storage portfolios. Spain’s CIUDEN completed operational testing of a 1 MW/8 MWh vanadium redox flow battery, integrating it into a broader 15 MWh hub that includes sodium‑sulfur and lithium‑ion units, thereby providing flexible, multi‑year storage for green‑hydrogen and synthetic‑fuel projects. Meanwhile, Sunamp’s Central Bank Mini brings phase‑change thermal storage to industrial heat streams, delivering up to 80 kWh of reusable heat and achieving a CO₂ payback in under a year. Together, these advances illustrate a global trend toward resilient, non‑lithium storage solutions that can support decarbonisation targets across power, heat, and industrial sectors.