Two Factories, One Bankruptcy
Workers at the LG-GM Ultium Cells plant in Spring Hill, Tennessee are preparing for a different kind of production run. The cells once destined for electric vehicle drivetrains will give way to lithium iron phosphate cells for stationary energy storage. LG and GM are converting part of their joint venture facility to LFP production for the storage market.
Spring Hill is not an anomaly. It is one of two North American battery factory pivots now underway, part of a broader industrial realignment as EV demand cools and stationary storage demand keeps building.
The pivot. LG Energy Solution is also converting its Lansing, Michigan facility into a prismatic LFP cell hub under a $4.3 billion supply agreement with Tesla, confirmed by the U.S. Department of the Interior. Production is scheduled to begin in 2027, with the cells feeding Tesla’s Megapack 3 assembly line in Houston. Tesla’s energy division generated $12.8 billion in revenue in 2025, up 26.6% year over year. The company expects to begin shipping Megapack 3 units in the second half of 2026, claiming 40% construction cost reductions and the ability to deploy 1 GWh in 20 business days.
The pattern across both factories is consistent: manufacturers that invested billions in EV cell production are redirecting capacity toward stationary storage, the market segment that is still accelerating.
The bankruptcy. While Tesla was locking up domestic cell supply, the company that had been the third-largest U.S. battery storage integrator was being sold from a bankruptcy docket.
A U.S. Bankruptcy Court approved FlexGen’s acquisition of substantially all of Powin’s business assets: intellectual property, hardware designs, software, IT systems, and customer relationships. Powin, previously the third-largest U.S. BESS integrator behind Sungrow and Tesla, filed for bankruptcy in mid-2025 following a $44 million payment dispute with CATL and more than $300 million in debt.
Powin’s collapse traces to a specific dependency. The Oregon-based integrator relied on CATL for proprietary cell formats. When the payment dispute escalated, Powin had no fallback supplier. The dependency proved fatal: a company with genuine technical capability and a decade of deployments could not survive the loss of its sole cell source.
The squeeze. The independent integrator model, in which a company buys cells from a manufacturer, adds software and system design, then sells completed storage systems, is being compressed from both directions.
Battery OEMs have expanded into selling turnkey systems directly to project developers, reducing the role of the integration layer. Vertically integrated players like Tesla secure multi-billion-dollar domestic cell supply and manufacture their own modules, leaving diminishing margin for a middleman. Powin had built real technical capability, earning recognition for its battery management system expertise. None of that protected it when its primary cell supplier relationship collapsed.
The field. FlexGen now inherits Powin’s 11.3 GWh of installed projects and customer relationships, attempting to assemble a viable competitive position from the acquisition. The company is betting that Powin’s software IP and customer base matter more than owning cell production.
The U.S. integrator market has narrowed. Tesla is vertically integrated and accelerating. Sungrow retains the scale advantages of Chinese manufacturing. Fluence now produces domestically at facilities in Utah and Texas. FlexGen is building from Powin’s remains. The list of companies capable of competing for large U.S. storage projects is shorter than it was a year ago, and the barriers to entry are higher. Securing a reliable, long-term cell supply is no longer a procurement task; it is an existential requirement.
The conversion. The Spring Hill and Lansing conversions represent a structural shift in how North American battery manufacturing capacity is allocated. The EV battery buildout that absorbed tens of billions in capital investment over the past five years is finding its second act in stationary storage.
LG will supply Spring Hill cells for grid-scale storage, renewable energy, and data center applications across North America. The Lansing facility will produce cells for Tesla’s Megapack line. Two factories that were built for electric vehicles will instead stabilize the grid.
The economics. These shifts are not occurring in a vacuum. Chinese-made BESS units now face an effective tariff rate of approximately 60%, combining the reciprocal tariff with a 25% Section 301 tariff on battery components. Industry analysts note that while the long-term technology cost curve continues downward, near-term system prices in the U.S. will return to approximately 2024 levels. The divergence between global cost deflation and U.S. tariff-driven inflation creates a two-speed market: one in which domestic manufacturing capability becomes a competitive advantage rather than a cost center.
Tesla’s $4.3 billion LG deal and the Ultium Cells conversion are direct responses to that two-speed dynamic. Companies that can source FEOC-compliant cells from domestic or allied-nation production will avoid the tariff penalty. Companies that cannot will compete at a structural cost disadvantage.
Powin’s bankruptcy is the cautionary tale. It is not enough to design good systems or write capable software. In a market where cell supply determines survival, the companies that control their supply chains (or secure binding, long-term agreements with those who do) will persist. The rest will find themselves on a bankruptcy docket, with their intellectual property sold to the highest bidder.
LFP cells from production lines that until recently assembled electric vehicle battery packs will be powering commercial and grid-scale storage through the end of the decade.
Sources
U.S. Government Confirms Tesla as Mystery Buyer in $4.3 Billion LG Energy Solution LFP Deal (pv magazine USA)
LG and GM Pivot Ultium Cells JV to LFP Battery Production for U.S. Storage Market at Tennessee Plant (pv magazine USA)
LG Energy Solution’s $4.3 Billion Agreement with Tesla and LFP Manufacturing with GM (Energy-Storage.News)
US Bankruptcy Court Approves FlexGen Acquisition of Powin Assets Including All IP (Energy-Storage.News)
Can FlexGen Leverage Powin’s Bankruptcy to Compete with Tesla? (Latitude Media)
Tesla, LG to Build $4.3B Battery Plant as Part of Supply Agreement (Utility Dive)
BESS Prices Set to Increase in Short Term (Energy-Storage.News)
Powin Bankrupt: What It Means for Grid Batteries (Canary Media)