The archive · Climate & Energy · Strategic decision · 2012–2025
Natron's Sodium-Ion Bet Fails: First US Line Shuts
Natron bet on sodium-ion batteries for data centers, opened first US line, but shut down in 2025 after financing froze.
Natron Energy
What the business is
Natron makes sodium-ion batteries: it uses Prussian-blue electrodes and sodium electrolyte to produce batteries, focusing on data-center backup power, grid energy storage, industrial power supplies, and fast charging, claiming more than 50,000 cycles and charge/discharge about 10 times faster than lithium batteries.
Starting capital：Cumulative financing exceeded $363M (Khosla Ventures, Liberty Oilfield, United Airlines, and others); the Holland factory received an additional $40M for retrofitting, including $19.8M from ARPA-E.
How it started
In 2012, Colin Wessells founded Natron (Santa Clara, California), based on Prussian-blue electrode research from a Stanford University laboratory, making sodium-ion batteries that contain no lithium, cobalt, or nickel; ARPA-E was its first funding source in 2012 and added more in 2020, with strategic customers such as Chevron and Nabors participating, and cumulative financing exceeded $363M.
What happened
On 2024-04-29, the Holland, Michigan factory began commercial mass production, becoming the first commercial sodium-ion battery production line in the United States: it spent $40M to retrofit an existing $300M lithium-battery plant, with full production of about 600MW/year, and began shipping to data-center customers in 2024-06; in 2024-08 it announced building a $1.4B, 1.2M-square-foot gigafactory in eastern North Carolina, planned for 24GW annual output and 1062 jobs. In 2025-04 it received a $55.4M Series F follow-on, but from 2025-06 investors froze payments, and all summer financing options (shareholder follow-on investment, convertible debt, and a management buyout) failed.
How it ended up
Closure: on 2025-09-03 it ceased operations, closing the Holland and Santa Clara factories, permanently laying off 95 people, and about $25M in booked orders would no longer be delivered; the largest shareholder Sherwood Partners planned to sell the company's assets.
Background
Natron Energy was founded in California in 2012, making batteries with Prussian-blue electrodes plus sodium electrolyte, focusing on data-center backup power and grid energy storage: it claimed no lithium, cobalt, or nickel, non-flammable and non-explosive, more than 50,000 cycles, and charge/discharge about 10 times faster than lithium batteries. The company raised more than $363M cumulatively, with investors including Khosla Ventures, Liberty Oilfield, and United Airlines; ARPA-E was its earliest government funding.
On 2024-04-29, the Holland, Michigan factory began commercial mass production, becoming the first commercial sodium-ion battery production line in the United States: it spent $40M to retrofit an existing lithium-battery plant, with full production of about 600MW/year, and began shipping to data-center customers in 2024-06, directly betting on AI computing demand for 24/7 backup power. In 2024-08 the company further announced building a $1.4B gigafactory in eastern North Carolina, planned for 24GW annual output and 1062 jobs.
The turning point began in spring 2025: after receiving a $55.4M Series F follow-on in 2025-04, investors froze planned payments from 2025-06; throughout the summer the company tried shareholder follow-on investment, convertible debt, and management buyout options, confirmed the financing failure to the board at the end of 2025-08, ceased operations on 2025-09-03, closed the Holland and Santa Clara factories, laid off 95 people, about $25M in booked orders would no longer be delivered, and the largest shareholder Sherwood Partners began selling assets.
Industry backdrop: almost all global sodium-ion battery capacity (including capacity under construction) is in China, and U.S. peers Acculon, Bedrock Materials, and Peak Energy are also ramping up; a 2025-01 Stanford study also pointed to concerns about degradation in sodium-ion battery cycle life and long-term performance. Natron started as 'the first in North America' but could not convert its first-mover advantage into cash flow.
What has to be true
- Tech bet early and narrow: Prussian-blue advantages matched data centers, but all-in on immature chemistry.
- First mover meant heavy assets: factories became burden when orders and financing cut off.
- Market timing mismatch: 2024 factories built, 2025 demand not scaled, investors withdrew.
- Single financing source: Series F frozen, no fallback, $25M orders undelivered, liquidation.
What can be applied
First production line doesn't create market: capacity bets on cost curve, but orders and financing are oxygen. Tech leadership can't save cash flow.
Aftermath
As of 2026-09-01: Natron has ceased operations, two factories have closed, 95 people have been permanently laid off, about $25M in orders remain undelivered, and assets are being sold by the largest shareholder Sherwood Partners; the first baton of North American sodium-ion commercial mass production has thus been handed back to peers such as Acculon, Bedrock Materials, and Peak Energy, and the industry still has not achieved scale.
Sources
- Natron Energy Scales Up Production of Sodium-ion Batteries at West Michigan Facility
- Facing liquidity problems, sodium-ion startup Natron Energy closes its doors
- Battery maker building $1.4B 'gigafactory' goes out of business
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