Lithium iron phosphate has become the default chemistry for grid storage, and for good reason. Sodium-ion is now arriving at commercial scale, and clients increasingly ask whether it belongs on their site. The honest answer is: sometimes.
Where LFP still leads
LFP offers a mature supply chain, well-understood degradation and higher energy density, which keeps land use and enclosure counts down. For most multi-hour projects today, it remains the safer financial choice.
We choose a chemistry per project, not per brochure.
Sodium-ion is attractive where its strengths matter: better cold-weather performance, no lithium in the supply chain, and a wider safe operating window. The trade-off is lower density and a shorter track record.
How we compare them
Lifetime cost per delivered MWh, not cost per installed kWh
Site climate and how much heating or cooling each option needs
Available land and the number of enclosures required
Warranty terms, supplier strength and bankability
For now, most of our projects still use LFP. We expect that mix to change, and we design so that later augmentation can use either.
