Case File · De Soto, Kansas · Johnson County
Former ammo plant. $4B battery megaplant.
Kansas passed the APEX Act in February 2022 specifically to land a mega-investment project. Five months later Panasonic Energy selected De Soto for an approximately $4 billion cylindrical Li-ion battery plant at the former Sunflower Army Ammunition Plant. Mass production of automotive cells began July 2025. The Kansas playbook for repurposing a federal-legacy industrial site is now on the record.
Cited site read: 70/100 — operational megaplant with live remediation and EV-cycle risk.
~$4B
Investment
~1.2M m²
Site
APEX
Incentive Act
Jul 2025
Production Start
Sunflower AAP
Legacy
70/100
RealClear
De Soto, KS · 2022 — 2025
APEX Act to cylindrical cells.
Three years from enabling legislation to mass production on a former federal industrial site.
February 2022
Kansas passes the APEX Act
The Kansas Legislature passes the Attracting Powerful Economic Expansion (APEX) Act in a special-session posture, creating a tiered incentive package specifically targeted at landing a mega-investment project in the state. The legislation is widely understood to be aimed at a Panasonic battery project then in national competition.
July 13, 2022
Kansas announces Panasonic selects De Soto
Governor Laura Kelly and the Kansas Department of Commerce announce Panasonic Energy's selection of De Soto for an approximately $4B cylindrical lithium-ion battery plant. The site is at the former Sunflower Army Ammunition Plant, now redeveloped as Astra Enterprise Park. The announcement is the first use of the APEX Act.
2022–2023
Site preparation and construction on the former Sunflower AAP
Panasonic Energy of North America begins site-prep and construction on the ~1.2 million square meter (~300-acre equivalent) build. The project leverages the pre-existing federal industrial designation and utility posture of the Sunflower site; environmental remediation obligations tied to the legacy Army use remain under federal oversight.
2023–2024
Infrastructure and grid build-out accelerate
Infrastructure upgrades around the site, including road, water, and electric-transmission capacity, accelerate to serve the battery plant and anticipated supplier cluster. The City of De Soto, Johnson County, and Kansas DOT coordinate road and utility upgrades.
July 2025
Mass production of automotive Li-ion cells begins
Panasonic Energy reports mass production of cylindrical Li-ion cells for automotive customers has begun at the De Soto facility. The plant is operational. Industry trade press confirms the opening timeline and capacity ramp details.
December 2025
Expanded battery deal announced for 2026 ramp
Panasonic Energy and automotive customers announce an expanded battery supply arrangement keyed to the De Soto plant, with a capacity ramp targeted for 2026. The expansion signals durable demand despite broader EV-cycle softness.
Ongoing
De Soto plant anchors a Kansas battery supply cluster
The De Soto facility becomes the anchor for a Kansas-centered battery supply cluster, with Panasonic and its customers driving supplier interest in surrounding Johnson County and Kansas City metro-area industrial parcels.
Ongoing
Environmental remediation oversight continues on former Sunflower land
Federal remediation obligations tied to the legacy Sunflower Army Ammunition Plant use remain under oversight. The Panasonic site sits within the broader redevelopment footprint; any future expansion must coordinate with remediation boundaries.
The Counterparties
State legislature, governor, local partners.
Every actor here is on the APEX Act record, Kansas Department of Commerce file, or Panasonic press release.
Panasonic Energy of North America
Applicant and Operator
Documented Record
Selected De Soto, Kansas in July 2022 for an approximately $4B cylindrical Li-ion battery plant. Began mass production of automotive cells at the site in July 2025.
U.S. corporate subsidiary of Panasonic Holdings Corporation. Read the parent's investor communications alongside PENA press for the full capacity-ramp picture — the De Soto site is a material piece of parent-level battery strategy.
Governor Laura Kelly
Governor of Kansas
Documented Record
Signed the APEX Act into law and announced Panasonic's selection of De Soto on July 13, 2022 as the largest economic development project in Kansas history at announcement.
State-level political sponsorship was clean. The 'largest in Kansas history' framing was official gubernatorial messaging; verify against Kansas Department of Commerce data before reusing the superlative in client materials.
Kansas Legislature
APEX Act Sponsors
Kansas State Capitol
Documented Record
Passed the Attracting Powerful Economic Expansion (APEX) Act in a February 2022 special-session posture, creating the tiered incentive package used for the Panasonic selection.
The APEX Act was the critical legislative move. Kansas-style megasite incentive legislation is a replicable template; watch how other Midwest states follow with tiered mega-project programs.
Kansas Department of Commerce
Incentive Administrator
Documented Record
Administered the APEX Act incentive package for the Panasonic project and coordinated site-selection negotiations alongside state and local partners.
The Commerce department is the reporting counterparty for ongoing APEX compliance and disclosure. Any future APEX-eligible project in Kansas runs through this agency.
City of De Soto / Johnson County
Local Government Partners
De Soto, KS
Documented Record
Coordinated local permitting, infrastructure upgrades, and public-facing communications around the plant's siting and construction on the former Sunflower AAP footprint.
Local government posture was aligned throughout. The redevelopment of the Sunflower site had been a long-standing local economic-development priority; Panasonic's selection was the capstone outcome of that multi-decade work.
Astra Enterprise Park / Sunflower Redevelopment
Master Developer
Documented Record
Sunflower Redevelopment (Astra Enterprise Park) assembled and marketed the former Sunflower Army Ammunition Plant site, carrying the pre-existing industrial posture that made the Panasonic selection possible.
Private master-developer infrastructure at federal-legacy industrial sites is an underrated competitive advantage for Midwest jurisdictions. De Soto shows the long tail of brownfield-to-megasite redevelopment.
Why De Soto Moved Fast
Six enablers and two live risks.
Federal-legacy site + purpose-built state legislation produced a megaplant in under 36 months.
APEX Act Was Purpose-Built
The Kansas Legislature passed APEX in February 2022 specifically to land a mega-investment project. Purpose-built legislation is the cleanest incentive path for a mega-manufacturing siting decision.
Federal-Legacy Industrial Posture
The Sunflower Army Ammunition Plant had already operated as federal industrial for decades. The land-use conversation was a known quantity on day one.
Local Government Aligned
Johnson County and the City of De Soto had worked Sunflower-site redevelopment for years. Panasonic walked into a jurisdiction that knew what it wanted.
Utility Capacity Pre-Staged
Transmission and water capacity around Sunflower had been sized for industrial use for generations. Long-lead utility items weren't standing starts.
Risk — Environmental Remediation Legacy
The Sunflower AAP carries ongoing federal remediation obligations. Any future expansion must coordinate with remediation boundaries — plan multi-agency review time.
Risk — EV Demand Cycle
U.S. EV demand softening has compressed battery capex cycles industry-wide. Monitor Panasonic Holdings investor communications for capacity-ramp adjustments at the De Soto plant.
The Intelligence
What RealClear reads at Astra Enterprise Park.
Legislation. Federal-legacy land. Local alignment. Operational plant. Remediation tail.
Site Analysis
Panasonic Energy of North America
De Soto, KS — former Sunflower Army Ammunition Plant (Astra Enterprise Park)
Favorable Conditions
- Site reuse of former Sunflower Army Ammunition Plant — pre-industrial posture
- Kansas APEX Act (Attracting Powerful Economic Expansion) incentive package
- ~$4B initial commitment; ~1.2M m² (~300-acre equivalent) build
- Panasonic Energy of North America as U.S. corporate counterparty
- Mass production of automotive cylindrical Li-ion cells began July 2025
Site History
Former federal Sunflower AAP site — long industrial footprint; now Astra Enterprise Park.
State Incentives
Kansas APEX Act (2022) passed specifically to land a mega-investment project.
Risk — Environmental Legacy
Historic contamination at the Sunflower AAP continues to carry federal remediation oversight.
Risk — EV Demand Softness
U.S. EV demand softening has compressed battery capex cycles industry-wide.
Recommendation
PROVEN MEGASITE-ON-FEDERAL-LEGACY PATTERN. Kansas passed the APEX Act specifically to land this class of project, and De Soto repurposed a federal industrial site with pre-existing infrastructure. Watch environmental remediation oversight and follow EV-cycle demand commentary from Panasonic Holdings for capacity-ramp signals.
Federal-legacy land is an underrated advantage
Screen your next battery site for legacy-industrial posture.
This cited case review examines the cited APEX legislation, industrial inventory, and battery-capex record relevant to the De Soto site and selected manufacturing comparables.
Cited research summary · Not legal advice · Verify independently before making investment decisions