Energy Grid
It’s in the sea. It’s in your kitchen. It’s the sixth most common element in the Earth’s crust. Sodium is everywhere. So why aren’t sodium ion batteries?
The main thing holding sodium ion batteries back is that sodium ions are chunky. Properly chunky. With a mass about three times that of lithium, that extra bulk comes at a cost in battery chemistry. Bigger ions mean you can’t pack as many into a cell, which drags down energy density. And unless you’re nostalgic for the old Nokia brick or happy with an electric vehicle that gives up halfway through your journey, that’s a problem. Sodium ion batteries simply don’t cut it for many of today’s modern applications. Yet, with lithium supply chains under strain, environmental questions around mining getting louder, and growing concerns over lithium ion fire risks, you’re left wondering… surely sodium ion batteries must be good for something?
Why sodium actually has a lot going for it
In many ways, sodium ions are perfect for batteries. Sodium is abundant, less environmentally damaging to obtain, and the batteries charge faster, work across wider temperature ranges, and are far less likely to catch fire or explode. But the energy density issue really is the one flaw you can’t ignore. It’s like finding the perfect partner, but then you find out they clap when the plane lands. Tragic. That said, while the low energy density is a dealbreaker for portable tech, it matters much less once you scale up to the size and requirements of battery energy storage (BESS) systems.
Enter the energy storage boom
The BESS market is on track to double by the end of the decade, landing somewhere between $120 billion and $150 billion. The rapid rollout of renewable energy is one of the drivers because, as we all know, the sun doesn’t always shine and the wind doesn’t always blow. At the moment, we still rely on gas to fill the gaps but if we’re aiming for net zero, it’s all eyes on energy storage.
The International Energy Agency says global energy storage needs to increase six times by 2030 to support the renewable energy boom, with 90% of that coming from batteries. But you also need to consider the growing demand for compute. New AI data centres require huge amounts of power and their electricity use can spike or drop within minutes. Batteries help smooth those swings because they respond in only seconds. And with interconnection queues stretching into the multi year range, more companies are colocating data centres with on site energy generation and battery storage to secure reliable power without waiting for grid upgrades.
All of this makes battery storage more important than ever.
Where sodium shines
Back in January, the largest lithium ion battery fire on record broke out in Moss Landing, California, forcing more than 1,500 people to evacuate. As more BESS installations sit close to cities, homes, and critical infrastructure, safer chemistries genuinely matter. That’s where sodium ion batteries come into their own, because grid storage doesn’t need to be light and it certainly doesn’t need to fit in your pocket. It needs to be dependable and it needs to be safe.
One huge step forward for sodium ion batteries was the recent announcement from Peak Energy. They agreed a multi year deal with Jupiter Power to supply up to 4.75 GWh of sodium ion battery systems between 2027 and 2030, including 720 MWh in 2027 alone, the largest single sodium ion deployment ever announced. The contract is worth over $500 million.
As Peak Energy’s CEO Landon Mossburg put it,
“Sodium-ion will be the winning technology for grid-scale storage, which is absolutely essential to meet increasing demand from hyperscalers and AI. Deploying the world’s largest sodium-ion energy storage system with one of the nation’s top Independent Power Producers proves that sodium is ready for today and will dominate the future.”
In leagues of their own
Lithium isn’t going anywhere. It’s still the best choice for portable electronics, electric vehicles, and anything where size and weight matter. But sodium is carving out a clear role in stationary storage where the priorities are completely different. Safer chemistry, easier to source, and ideal for a world that needs huge volumes of reliable energy storage. Sodium ion batteries are well placed to meet rising AI driven power needs and help cover the gaps renewable energy can’t fill. So think of it less as lithium’s rival and more as its dependable friend. The one who claps when the plane lands, yes, but still turns up exactly when you need them.
