Panasonic Energy began mass production of 2170 cylindrical cells at De Soto, Kansas on 2025-07-14 (Panasonic Energy press release). By 2026-02-03, two of eight lines were running, a fourth starting up, plant approaching 50% capacity with 1,400 workers on site (Kansas Reflector, citing VP of HR). Second wing construction underway; two of four additional lines expected operational 2027.
Multi-customer by design, not a single-OEM joint venture. Combined with Nevada (~41 GWh), full Kansas buildout brings US Panasonic cell capacity to ~73 GWh. No chemistry conversion, application pivot, or ownership restructuring announced or signaled. Last verified 2026-02-03.