Status Header
| Facility | Panasonic Energy, De Soto, Kansas (wholly owned) |
| Announced capacity | 32 GWh |
| Chemistry | 2170 cylindrical; cathode chemistry unconfirmed for this facility in located public disclosures |
| Investment | ~$4B per press reports; not confirmed from a located Panasonic SEC filing or press release as of 2026-07-17 |
| Stated status | Mass production of 2170 cells begun July 2025; four lines operational; data-center cell production disclosed June 2026 with mass production targeted FY3/29 |
Assessed status: Producing, but line allocation between EV and data-center applications is undisclosed. The 32 GWh figure persists in US capacity trackers as automotive. Its application-addressable breakdown cannot be verified. Panasonic's historical 2170 production for Tesla has been NCA; whether De Soto produces NCA, NMC, or both has not been independently confirmed.
The Ledger
2022-07 — Stated: Panasonic announces a 32 GWh EV battery manufacturing facility in De Soto, Kansas, positioned as expansion of automotive cylindrical cell supply for North America. Investment reported at approximately $4B across multiple outlets. Source note: the originating Panasonic press release or filing establishing the 32 GWh and $4B figures has not been independently located for this audit. Both numbers are carried from contemporaneous press reporting and have been repeated without revision in subsequent Panasonic materials. The figures are treated here as established but not primary-sourced.
Observed: Kansas approves an incentive package for the project. The specific dollar value, job-commitment thresholds, and clawback provisions of the Kansas incentive agreement have not been located in publicly available records as of 2026-07-17.
Gap: None on the announcement itself. The incentive agreement's terms are a structural unknown. That unknown becomes load-bearing later.
2023 through 2025-06 — Stated: Construction proceeds on announced timeline. Workforce hiring ramps toward stated targets.
Observed: KDOT initiates a dedicated infrastructure improvement project around the site, road upgrades graded as a state transportation agency priority. Construction activity tracks the stated timeline per local reporting. No WARN Act filings identified. No DOE LPO conditional commitment or closed loan appears in public LPO project listings. De Soto is self-financed with state incentives, which simplifies the proof-state picture: no conditional-commitment-to-closed-loan transition to track, no LPO modification risk to monitor.
Gap: None. Stated and observed align on site, timeline, application, and workforce trajectory.
2025-07-14 — Stated: Panasonic Energy announces mass production of 2170 cylindrical cells at De Soto. Four production lines operational. Approximately 1,800 employees. The facility targets approximately 32 GWh annual capacity once fully operational.
Observed: Production start consistent with original timeline. The 1,800-employee figure is verifiable against state incentive job-commitment thresholds in principle, though the specific thresholds remain unlocated. No WARN Act filings identified.
Gap: None on production start or workforce. The Kansas incentive agreement's terms, including whether product-application conditions attached to job and investment commitments, remain unconfirmed from public sources.
2026-06-08 (Investor Day) — Stated: Panasonic Energy's investor day discloses that De Soto will produce cells for data-center applications. Data-center cell mass production targeted FY3/29 (fiscal year ending March 2029). The deck's language:
"ramping up the Kansas factory and converting it for data center applications"
"Converting" implies reallocation of existing or planned capacity, not pure addition. The deck does not quantify the share being converted versus retained for automotive.
Observed: First public disclosure that De Soto output will include non-automotive applications. The investor day materials are silent on: how many of four operational lines are allocated to EV versus data-center cells; what share of current or planned capacity remains EV-addressable; whether the 32 GWh nameplate refers to automotive output, data-center output, or a combined total across both applications.
Gap: The facility's stated purpose has changed. The original narrative was 32 GWh of automotive cells. The June 2026 disclosure introduces a second application and quantifies nothing about the split. Anyone modeling domestic EV cell supply from US manufacturing can no longer carry De Soto as "32 GWh automotive." The defensible entry is "up to 32 GWh, application split unknown."
2026-06-17 (Kansas Reflector) — Stated: Kansas Reflector reports, citing a Panasonic representative, that EV cell production would continue at De Soto, with first data-center battery cells anticipated mid-to-late 2028 or early 2029. The framing presents data-center work as coexisting with continuing EV production. Kansas Reflector also reports the second wing expected operational by 2027.
Observed: The company's language carries zero quantitative content. A facility producing 30 GWh EV and 2 GWh data-center satisfies this framing. So does 5 GWh EV and 27 GWh data-center. No line-level or GWh-level allocation is disclosed. The company has not publicly stated how many lines produce EV cells, how many are being converted or added for data-center applications, or whether conversion requires new equipment versus reconfiguration of existing lines.
Gap: The stated position is consistent with continued EV production at any scale from token to dominant. It resolves nothing.
As of 2026-07-17 — Additional signals checked:
| Signal | Finding |
|---|---|
| 45X credit claims | No public disclosure of facility-level 45X claims for De Soto identified. Consistent with the broader pattern: no US battery facility has public facility-level 45X compliance evidence as of this date. Whether data-center cell output is 45X-eligible cannot be assessed without disclosure of both claims and Treasury's end-use eligibility interpretations. |
| Second wing | Kansas Reflector reports expected operational by 2027. No additional public evidence of construction progress, permitting, or equipment installation identified. Application mix for the second wing: undisclosed. |
| WARN Act filings | None identified through 2026-07-17. |
| Equipment supplier orders | No De Soto-specific references identified in earnings materials or press releases from major battery equipment suppliers (Wuxi Lead, Manz, Schuler, or others). |
| SEC filings | No Panasonic Holdings or subsidiary filings mentioning impairment, restructuring, or application conversion specific to De Soto identified. |
| Satellite/aerial imagery | No trade press references identified. |
| Job postings | Current posting volume and composition not independently verified. Whether posting language distinguishes between EV-line and data-center-line roles: unknown. |
Trajectory Assessment
Through July 2025, De Soto was among the cleaner proof files in the US battery manufacturing registry. On-time production start, workforce at stated levels, no layoffs or federal loan complications, no downsizing. The gap between stated and observed was negligible.
June 2026 changed what the gap measures. Four lines are running. Capacity exists. But how much of that capacity serves the application it was announced for now sits behind a disclosure wall Panasonic has not opened.
Before June 2026, stated narrative and observable evidence were aligned on both existence and application. After June 2026, the facility split into two applications without disclosing the allocation. The gap moved from whether De Soto is real to whether the number attached to it in every US EV supply model means what those models assume it means.
Every US capacity tracker and aggregate domestic supply model carrying De Soto as 32 GWh of EV cell capacity is now carrying an unquantified assumption. What would narrow the gap: Panasonic disclosing line-level or GWh-level allocation by application; publication of 45X credit claims distinguishing eligible output by end use; or named OEM customer evidence that anchors at least one side of the split.
If the current pattern holds, the second wing's reported 2027 completion adds capacity whose application allocation is equally opaque. That compounds the uncertainty. And the previously immaterial gap in the Kansas incentive agreement, whether application-specific conditions attached to the state's job and investment commitments, becomes relevant if the EV share drops materially below what was originally presented to Kansas.
Until a resolving signal surfaces, De Soto is a facility that is producing but whose contribution to domestic EV cell supply cannot be stated as a number.
Last verified: 2026-07-17
- Application conversion is spreading: Samsung SDI disclosed that StarPlus Energy in Indiana has been gradually converting lines from EV to ESS batteries since Q4 2025, with LFP mass production expected Q4 2026, but has not disclosed converted-line GWh, yield, or customer qualification evidence.
- BlueOval SK split restructures: Ford's May 2026 8-K shows the BlueOval SK joint venture has legally separated into Ford-owned Kentucky plants and SK-owned Tennessee operations, with Tennessee targeting automotive and ESS mass production in 2028, turning one DOE-backed project row into two with divergent product plans.
- MACR safe harbor still pending: IRS Notice 2026-15 provides interim MACR guidance but says forthcoming safe-harbor tables have not yet been published, leaving facilities like De Soto unable to demonstrate compliance with the prohibited-foreign-entity material-assistance test through a standardized framework.
- Data-center demand is unproven: Panasonic's conversion language targets FY3/29 for data-center cell mass production, but as Kansas Reflector reported from a Panasonic representative, first data-center cells are anticipated mid-to-late 2028 or early 2029, meaning no shipped product evidence will exist for at least two years.