Tesla LG Battery Deal Secures $4.3 Billion Supply
Tesla LG battery deal sends domestic LFP cells to Houston and cuts Section 301 tariff risk, shifting trader focus to U.S. storage supply positioning.
KEY TAKEAWAYS
- Deal routes domestic LFP cells from Lansing into Houston Megapack, shielding supply from Section 301 tariffs.
- Agreement starts August 2027 and runs three years through July 2030 with extension and volume options.
- Lansing will convert to LFP prismatic cells at 50 GWh capacity; Megapack 3 is a 5 MWh unit.
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Tesla’s LG battery deal, announced by the U.S. Department of the Interior on March 17, 2026, will route domestically made cells from LG Energy Solution’s Lansing, Michigan, facility into Houston-built Megapack units. This arrangement positions Tesla’s energy business to avoid Chinese lithium iron phosphate (LFP) tariffs.
Deal Terms and Factory Plans
The supply agreement begins in August 2027 and runs three years through July 2030, with options to extend up to seven years and increase volumes. Deliveries will align with the mass production ramp of Tesla’s energy storage program.
LG’s Lansing plant, originally launched as the Ultium Cells 3 joint venture with General Motors and fully acquired by LG in May 2025, is converting from nickel-manganese-cobalt (NMC) pouch EV battery production to LFP prismatic cells for energy storage. The facility has 50 gigawatt-hours of annual capacity, and equipment orders to retool the line are underway.
These cells will power Tesla’s next-generation Megapack 3, a 5 megawatt-hour unit up from 3.9 megawatt-hours in the previous model. Megapack 3 will be assembled at Tesla’s Houston Megafactory, which targets 50 gigawatt-hours of annual production. Assembly is scheduled to start in late 2026, initially using existing inventory until the new cells become available in 2027 under the contract.
Strategic Impact and Market Context
The deal is structured to shield Tesla’s U.S. supply from Section 301 tariffs on Chinese LFP imports, which can reach 82.4%. Tesla’s energy storage deployments rose from 31.4 gigawatt-hours in 2024 to 46.7 gigawatt-hours in 2025. The LG agreement complements a separate $2.1 billion contract with Samsung SDI for roughly 10 gigawatt-hours per year, reflecting Tesla’s efforts to diversify North American LFP sourcing.
By shifting part of its cell supply to domestic production timed with Houston assembly, Tesla aims to reduce exposure to high import duties and secure batteries for its growing storage business. The timing and domestic sourcing will influence U.S. storage supply as the new cell lines come online and optional contract extensions are exercised.
