General Motors' (GM.US) battery joint venture with LG Energy Solution, Ultium Cells LLC, will commence production of energy storage batteries at its Tennessee facility next month. This move is designed to repurpose the idled plant, which faced underutilization following GM's scaling back of electric vehicle plans, and to enter the rapidly expanding stationary energy storage market. Tom Gallagher, Vice President of Operations at Ultium, stated in an interview that the company will rehire approximately 700 workers who were temporarily laid off in January from the Spring Hill, Tennessee plant to begin producing lithium iron phosphate batteries. These batteries will be supplied to LG, which will then sell them to grid operators and data center clients. The plant, which first began operations in 2024, previously produced nickel-cobalt-manganese batteries for the Cadillac Lyriq, Vistiq, and the Honda Acura ZDX SUV, employing up to 1,350 workers at full capacity. Gallagher remarked, "Our ability to pivot our capacity to a new commercial opportunity in an extremely short period of time is a differentiator compared to other joint ventures." He revealed that the factory retooling cost "tens of millions of dollars," and the laid-off workers are expected to return by the end of April.
General Motors, along with many of its peers, is attempting to mitigate billions of dollars in losses in the electric vehicle sector by shifting joint venture plants from automotive batteries to energy storage batteries, or by divesting related businesses entirely. Although former President Trump's regulatory rollbacks and the removal of key EV tax credits have weakened an already slowing U.S. EV market, market forecasts indicate U.S. electricity demand will grow by 12% by 2030, with data center demand accounting for over a third of that increase.
For LG, the transformation of the Tennessee plant is a crucial part of its broader strategic pivot. While LG still plans to produce automotive batteries for General Motors, it is increasing production line flexibility to ensure operations can continue even during periods of weak EV demand. The Korean battery manufacturer is retooling four other EV battery plants in North America, including two in Michigan, a joint venture with Honda in Ohio, and a former joint venture with Stellantis in Windsor, Canada, all to shift production to lithium iron phosphate batteries for stationary energy storage systems. Its other Ultium joint venture plant with GM in Ohio will continue producing EV batteries for GM; a new plant in Arizona is also set to begin EV battery production this year.
Bob Lee, President of LG Energy Solution North America, indicated that the cost of retooling a plant for LFP battery production is typically 10% to 20% of the original investment, as only some equipment needs adjustment. UBS analyst Tim Bush noted that the U.S. market is a critical growth source for LG, unlike Europe, due to regulatory barriers. Bush stated that in terms of revenue and profit growth, "it's a bright spot." UBS highlighted that LG and its energy storage system customers could benefit from federal subsidies covering about 60% of storage system costs, including the 45X battery production tax credit and the 48E investment tax credit retained in the Trump budget proposal.
Tristan Doherty, Chief Product Officer at Vertech, LG's stationary energy storage system integration unit, expressed that even if the AI-driven data center construction boom slows, there is sufficient electricity demand in North America to absorb LG's available capacity. Doherty, speaking from LG's new Windsor factory, said, "Being able to retool these facilities in under a year means we can react quickly and actually hit capacity. We will be supplying U.S.-made cells to a majority of the U.S. market." UBS predicts that the combined market share of Korean manufacturers in the U.S. utility-scale market could rise from less than 10% in 2025 to over 50% by 2027.
For General Motors, the shift to energy storage systems is viewed as temporary. GM spokesperson Stu Fowle stated that the value of converting the Ultium plant to produce energy storage cells lies in returning furloughed workers to their jobs and keeping the plant ready for automotive battery production. In the future, General Motors plans to utilize lithium manganese-rich batteries, to be produced by LG. The two companies are betting that these manganese-rich batteries can compete on cost with lithium iron phosphate while offering superior performance. GM has not specified a U.S. production location, but the Spring Hill plant is capable of producing lithium manganese-rich batteries.
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