Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Climate Tech

Alsym Thinks It Can Break the U.S. Battery Manufacturing Curse

After a string of high-profile failures, this sodium-ion startup has a proprietary chemistry and a plan to compete on cost.

Sodium and Alsym.
Heatmap Illustration/Getty Images, Alsym Energy

It’s been a bad year for batteries. Grand plans to commercialize novel chemistries and build a manufacturing base outside of China have stumbled, with the collapse of both Northvolt and Natron casting a shadow over the sector. But just as many may be losing faith, there’s a new player in the space: Alsym Energy announced today that it’s rolling out a sodium-ion battery designed for stationary storage that it says will be cheaper than lithium-ion systems from day one.

“It’s always the darkest before the sunrise,” Alsym’s co-founder and CEO Mukesh Chatter told me, saying that past failures in the battery space are irrelevant to the specific tech his company is pursuing. The startup, which raised a $78 million Series C round last April, is targeting the battery energy storage market across utility-scale, commercial, and industrial applications — everything from grid-connected systems to power for data centers, high rise buildings, and mining operations.

Alsym’s chemistry is called sodium iron pyrophosphate, or NFPP+. The “plus” represents dopants — small amounts of additional elements — which are added to the chemistry to improve performance. While the specific dopants and the battery’s electrolyte are proprietary, Chatter told me that the technology doesn’t require the critical minerals lithium, cobalt, or nickel, and that the company will source raw materials entirely from the U.S. or its allies.

The product, which is scheduled to deploy on a small scale next year and reach higher volumes in 2027, follows a decade of research into nonflammable lithium-ion alternatives. The company spent years testing different chemistries after it spun out of MIT in 2015, before settling on NFPP+ chemistry within the last 18 months. Chatter remained tight-lipped about the specifics of that process, noting only that the company faced “a couple of false starts,” coupled with supply chain challenges earlier this year.

Now, though, those years of research might have finally paid off. “I believe we are farthest ahead than anyone else in that space today in the United States,” he told me.

One of Alsym’s key advantages, Chatter explained, is that its battery has been certified by the independent safety body Underwriter Laboratories as nonflammable, compared to lithium-ion batteries, which are notoriously not. Alsym’s battery also offers superior performance at both high and low temperatures. The company’s cells will be cost-competitive with the leading lithium-ion chemistry right off the bat, Chatter told me, and the overall system will be 30% cheaper because the battery’s thermal stability and ability to perform at high temperatures eliminates the need for the costly, maintenance-heavy cooling systems. It’s a similar value proposition to that of Peak Energy, another startup seeking to deploy sodium-ion battery storage systems.

While sodium-ion cells are less energy dense than lithium-ion, eliminating the entire HVAC system means that the system itself isn’t all that much bulkier, making it possible to deploy in space-constrained environments such as commercial or residential buildings.

Alsym aims to manufacture its sodium-ion cells in the U.S., both for supply chain security and to take advantage of the country’s abundant sodium reserves. The latter, Chatter told me, means that “it will be cheaper to build it in the United States than anywhere else.”

While Alsym operates a pilot plant making sodium-ion cells, the company plans to scale its production through partnerships with third parties who either operate existing lithium-ion cell facilities or are in the process of building them, as sodium-ion cells can be produced on the same lines. “We want to partner with somebody who has that scale,” Chatter told me, explaining that a company of Alsym’s size could never compete with China by going at it alone. “But if we can partner with a much larger player who has the heft and the skill set and expertise to build large plants — or already has lithium ion plants — then we can compete head to head.”

Tata Energy, a leading power company in India worth about $14 billion, led Alsym’s Series C round. Chatter said the company also has strategic support from several mining companies, with other early use cases likely to include microgrid installations as well as primary or backup power for data centers and telecom companies.

“It’s not exactly the most glamorous space right now,” Chatter admitted, acknowledging the string of recent battery company failures. “But things happen in ebbs and flows.” He thinks the sodium-ion sector just needs one big success to prove its potential as a safer, cheaper alternative. “It really is all about cost and revenue opportunities,” he told me. If all goes according to plan for Alsym, we won’t have to wait much longer to see if he’s right.

Blue

You’re out of free articles.

Subscribe today to experience Heatmap’s expert analysis 
of climate change, clean energy, and sustainability.
To continue reading
Create a free account or sign in to unlock more free articles.
or
Please enter an email address
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
Climate Tech

Exclusive: Octopus Energy Launches Battery-Powered Electricity Plan With Lunar

The companies are offering Texas ratepayers a three-year fixed-price contract that comes with participation in a virtual power plant.

Octopus and Lunar Energy.
Heatmap Illustration/Getty Images

Customers get a whole lot of choice in Texas’ deregulated electricity market — which provider to go with, fixed-rate or variable-rate plan, and contract length are all variables to consider. If a customer wants a home battery as well, that’s yet another exercise in complexity, involving coordination with the utility, installers, and contractors.

On Wednesday, residential battery manufacturer and virtual power plant provider Lunar Energy and U.K.-based retail electricity provider Octopus Energy announced a partnership to simplify all this. They plan to offer Texas electricity ratepayers a single package: a three-year fixed-rate contract, a 30-kilowatt-hour battery, and automatic participation in a statewide network of distributed energy resources, better known as a virtual power plant, or VPP.

Keep reading...Show less
Blue
AM Briefing

Blowing the Whistle

On Trump’s renewables embargo, Project Vault, and perovskite solar

Pollution.
Heatmap Illustration/Getty Images

Current conditions: Illinois far outpaces every other state for tornadoes so far this year, clocking 80, with Mississippi in a distant second with 43 • Western North Carolina’s Blue Ridge Mountains face high wildfire risk during the day and frost at night • A magnitude 7.4 earthquake off the coast of Honshu, Japan, has raised the risk of a tsunami.

THE TOP FIVE

1. Whistleblowers allege big problems with corporate carbon standards-setter

The nonprofit that sets the standards against which tens of thousands of companies worldwide measure their greenhouse gas emissions is secretive and ideologically tilted toward industry. That’s the conclusion of a new whistleblower report on which Heatmap’s Emily Pontecorvo got her hands yesterday. The problems at the Greenhouse Gas Protocol “are systemic,” and the nonprofit “seems to be moving further away from its commitment to accountability,” the report said. Danny Cullenward, the economist and lawyer focused on scientific integrity in climate science at the University of Pennsylvania’s Kleinman Center for Energy Policy who authored the report, sits on the Protocol’s Independent Standards Board. Due to a restrictive non-disclosure agreement preventing him from talking about what he has witnessed, he instead relied on publicly available information to illustrate the report. “Not only does the nonprofit community not have a voice on the board,” Cullenward wrote, but the absence of those voices “risks politicizing the work of scientist Board members.” Emily added: “While the Protocol’s official decision-making hierarchy deems scientific integrity as its top priority, in practice, scientists are left to defend the science to the business community.” The report follows a years-long process meant to bolster the group’s scientific credibility. “Critics have long faulted the Protocol for allowing companies to look far better on paper than they do to the atmosphere,” Emily explains. But creating standards that are both scientifically robust and feasible to implement is no easy feat.

Keep reading...Show less
Red
Carbon Removal

Leading Climate Standards Group Fraught With Secrecy and Bias, Whistleblowers Say

A new report shared exclusively with Heatmap documents failures of transparency and governance at the Greenhouse Gas Protocol.

Pollution and trees.
Heatmap Illustration/Getty Images

It is something of a miracle that tens of thousands of companies around the world voluntarily report their greenhouse gas emissions each year. In 2025, more than 22,100 businesses, together worth more than half the global stock market, disclosed this data. Unfortunately, it’s an open secret that many of their calculations are far off the mark.

This is not exactly their fault. To aid in the tedious process of tallying up carbon and to encourage a basic level of uniformity in how it’s done, companies rely on standards created by a nonprofit called the Greenhouse Gas Protocol. The group’s central challenge is ensuring that its standards are both credible and feasible — two qualities often in tension in greenhouse gas accounting. The method that produces the most accurate emissions inventory may not always be feasible, while the method that’s easy to implement may produce wildly inaccurate results.

Keep reading...Show less
Yellow