Quoted exactly and dated only as precisely as the source. Copies of one release count as one origin. A withdrawn statement stays visible and is labelled.
23 April 2026 · Financing · Whole project
Closed
DOE Advanced Reactor Demonstration Program cooperative agreement, 50/50 cost share (covers the first Xe-100 plant and the TX-1 fuel facility, not this plant alone)
Company reported X-energy (SEC prospectus, 424B4) · Counterparty: U.S. Department of Energy · Government cost share · USD 1.2bn
“The cooperative agreement for the program, signed in February 2021 (the “ARDP Agreement”), provides 50/50 cost share of $2.4 billion of eligible costs ($1.2 billion reimbursement) through 2027”
Source: X-energy (SEC prospectus, 424B4) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
11 May 2023 · Customer / offtake · Whole project
Agreement signed
Joint development agreement between Dow and X-energy; Dow named an ARDP sub-awardee
Joint release Dow and X-energy (joint release, Dow newsroom) · Counterparty: Dow · Bindingness not stated
“Dow and X-energy previously announced their entry into a joint development agreement ("JDA") to install an advanced SMR nuclear plant at an industrial site in North America. The U.S. Department of Energy ("DOE") named Dow a sub-awardee under X-energy's Advanced Reactor Demonstration Program ("ARDP") Cooperative Agreement.”
Source: Dow and X-energy (joint release, Dow newsroom) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
13 August 2026 · Customer / offtake · Whole project
Agreement signed
Master Project Development Agreement with Dow, continuing the 2023 joint development agreement
Company reported X-energy (SEC Form 10-Q, Q2 2026) · Counterparty: Dow · Bindingness not stated
“During the year ended December 31, 2025, the Company entered into the Master Project Development Agreement (“MPDA”) with Dow, which is a continuation of the project under the previously existing joint development agreement with Dow entered into during the year ended December 31, 2023”
Source: X-energy (SEC Form 10-Q, Q2 2026) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
Target stated 31 March 2025 · Construction · Whole project
Target: construction, Date not disclosed
Revised at permit filing: construction "later this decade", start-up "early next decade"
Joint release Dow and X-energy (joint release, Dow newsroom)
“The proposed project could begin construction later this decade and start up early next decade.”
Source: Dow and X-energy (joint release, Dow newsroom) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
Target stated 31 March 2025 · Permissions · Whole project
Target: permission issued, Date not disclosed
Construction permit approval timeline stated at filing ("could take up to 30 months")
Joint release Dow and X-energy (joint release, Dow newsroom) · Authority: U.S. Nuclear Regulatory Commission · Jurisdiction: United States (federal)
“Approval of the construction permit is an important step forward that could take up to 30 months. Once the permit is received and upon Dow confirming the ability to deliver the project while achieving its financial return targets, construction could begin.”
Source: Dow and X-energy (joint release, Dow newsroom) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
2 May 2025 · Permissions · Whole project
Application submitted
Construction permit application, four-unit Long Mott Generating Station (10 CFR part 50)
Regulator issued U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) · Authority: U.S. Nuclear Regulatory Commission · Jurisdiction: United States (federal)
“On March 31, 2025, Long Mott Energy, LLC., a wholly owned subsidiary of the Dow Chemical Company, filed an application for a construction permit for a four-unit power reactor facility to be located in Calhoun County, Texas”
Source: U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
10 June 2025 · Permissions · Whole project
Application accepted for review
Construction permit application accepted for docketing (Docket No. 50-614)
Regulator issued U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) · Authority: U.S. Nuclear Regulatory Commission · Jurisdiction: United States (federal)
“The NRC staff determined that the LME application is complete and acceptable for docketing in accordance with 10 CFR 2.101(a) and 10 CFR part 50 and assigned the Docket No. 50-614. The NRC staff provided LME notice of the acceptance and docketing determination by letter dated May 12, 2025”
Source: U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
14 May 2025 · Technical milestones · Whole project
Design disclosed
Xe-100 reactor output and design life
Government record U.S. Department of Energy, Office of Nuclear Energy
“A single reactor can produce 80 megawatts of electric output or 200 megawatts of process heat and is designed to operate for 60 years.”
Source: U.S. Department of Energy, Office of Nuclear Energy ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
Target stated 11 May 2023 · Construction · Whole project
Target: construction, 2026
Original plan at site selection: construction to begin in 2026, completion by the end of the decade
Joint release Dow and X-energy (joint release, Dow newsroom)
“Construction on the four-reactor project is expected to begin in 2026 and to be completed by the end of this decade.”
Source: Dow and X-energy (joint release, Dow newsroom) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
20 February 2026 · Permissions · Whole project
Application accepted for review
Contested hearing: Licensing Board admits San Antonio Bay Estuarine Waterkeeper as a party (application still under review)
Regulator issued U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) · Authority: NRC Atomic Safety and Licensing Board · Jurisdiction: United States (federal)
“Thereafter, in a January 22, 2026 issuance the Board determined that Petitioner had standing and had submitted a contention that was, in part, admissible and so admitted Petitioner as party to this proceeding.”
Source: U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
23 April 2026 · Customer / offtake · Whole project
Agreement signed
Dow can end the MPDA and Commercial Cooperation Agreement at any time for convenience
Company reported X-energy (SEC prospectus, 424B4) · Counterparty: Dow · Bindingness not stated
“For example, Dow may terminate its MPDA and CCA with us at any time for convenience without regard for our performance.”
Source: X-energy (SEC prospectus, 424B4) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
20 May 2026 · Permissions · Whole project
Permission issued
Environmental review step only: exemptions from the environmental impact statement requirement, with an environmental assessment and finding of no significant impact (not the construction permit)
Regulator issued U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) · Authority: U.S. Nuclear Regulatory Commission · Jurisdiction: United States (federal)
“The NRC is granting the exemptions, and issuing the environmental assessment (EA) and FONSI concurrently to satisfy its obligations under the National Environmental Policy Act of 1969 (NEPA) and requirements under NRC regulations, related to the proposed action.”
Source: U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
4 June 2026 · Technical milestones · Whole project
Conflicting sourcesDesign disclosed
Plant configuration as described by X-energy: four 80 MWe reactors, 320 MWe
Company reported X-energy (SEC filing, Q1 2026 results presentation)
“One Xe-100 Plant consists of four 80 MWe reactors, for a total capacity of 320 MWe”
Source: X-energy (SEC filing, Q1 2026 results presentation) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
4 June 2026 · Technical milestones · Whole project
Conflicting sourcesTesting reported
Irradiation testing of TRISO-X pebble fuel (the Xe-100's fuel) at Idaho National Laboratory
Company reported X-energy (SEC filing)
“In addition, irradiation testing for the TRISO-X pebble fuel is in progress at Idaho National Laboratory in collaboration with the NRC.”
Source: X-energy (SEC filing) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
13 August 2026 · Financing · Whole project
Drawn / disbursed
Cumulative ARDP reimbursements to X-energy as of June 30, 2026 (whole award: plant and TX-1 fuel facility work)
Company reported X-energy (SEC Form 10-Q, Q2 2026) · Counterparty: U.S. Department of Energy · Government cost share · About USD 546.7m
“As of June 30, 2026, we have been reimbursed approximately $546.7 million in funding under the ARDP.”
Source: X-energy (SEC Form 10-Q, Q2 2026) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
Target stated 13 August 2026 · Operational delivery · Whole project
Target: commercial operation, Date not disclosed
Construction after the permit; commercial operation "in the early 2030s"
Company reported X-energy (SEC Form 10-Q, Q2 2026)
“The Dow project’s Construction Permit Application is anticipated to be received in the first quarter of 2027, following which construction can commence, and its commercial operations date is expected to be in the early 2030s.”
Source: X-energy (SEC Form 10-Q, Q2 2026) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
13 August 2026 · Financing · Whole project
Conflicting sourcesAnnounced
Funding responsibility for building the plant: Dow funds it and is eligible for 50% ARDP reimbursement
Company reported X-energy (SEC Form 10-Q, Q2 2026) · Counterparty: Dow; U.S. Department of Energy · Government cost share
“Finally, for the construction of the Xe-100 plant, Dow is responsible for the funding of the Xe-100 plant at the Seadrift site and is eligible to receive 50% reimbursement for this funding through the ARDP program.”
Source: X-energy (SEC Form 10-Q, Q2 2026) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
13 August 2026 · Financing · Whole project
Conflicting sourcesClosed
DOE approves ARDP continuation application: budget period extended through March 2027
Company reported X-energy (SEC filing) · Counterparty: U.S. Department of Energy · Government cost share
“X-energy has received formal approval of its ARDP continuation application for a budget period extension through March 2027.”
Source: X-energy (SEC filing) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
13 August 2026 · Financing · Whole project
Conflicting sourcesConditional
Additional ARDP allocation to X-energy: selected, but subject to a contract modification and continuation approvals (amount not stated)
Company reported X-energy (SEC Form 10-Q, Q2 2026) · Counterparty: U.S. Department of Energy · Government cost share
“While we have been notified that we were selected to receive an additional amount under the ARDP, any increase in the amount allocated to X-energy remains subject to execution of a subsequent contract award modification to the ARDP Agreement by the DOE’s contracting officer and continuation application approvals.”
Source: X-energy (SEC Form 10-Q, Q2 2026) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
20 August 2026 · Permissions · Whole project
Application accepted for review
NRC notices the mandatory (uncontested) hearing on the construction permit application, set for September 22, 2026 (application still under review)
Regulator issued U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) · Authority: U.S. Nuclear Regulatory Commission · Jurisdiction: United States (federal)
“The U.S. Nuclear Regulatory Commission (NRC) is providing public notice of an uncontested hearing on a construction permit application from Long Mott Energy, LLC (LME) for construction of the Long Mott Generating Station (LMGS), a four reactor facility to be built in Calhoun County, Texas.”
Source: U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
20 August 2026 · Technical milestones · Whole project
Design disclosed
Plant configuration as described by the NRC: four Xe-100 reactors, 800 MW thermal
Regulator issued U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) · Counterparty: U.S. Nuclear Regulatory Commission
“The facility, designated as LMGS, would be an 800 megawatts-thermal nuclear power plant comprising four X-Energy, LLC (X-energy) Xe-100 small modular high-temperature gas-cooled reactors and associated common facilities in Calhoun County, Texas.”
Source: U.S. Nuclear Regulatory Commission (Federal Register, via govinfo.gov) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
Target stated 13 August 2026 · Permissions · Whole project
Target: permission issued, Q1 2027
Construction permit expected in the first quarter of 2027 (18-month NRC review)
Company reported X-energy (SEC Form 10-Q, Q2 2026) · Authority: U.S. Nuclear Regulatory Commission · Jurisdiction: United States (federal)
“a wholly owned subsidiary of Dow, filed a Construction Permit Application (“CPA”) with the NRC in March 2025 which was docketed in May 2025 for an 18-month review period with an expected review completion by late 2026 and receipt of the CPA expected in the first quarter of 2027.”
Source: X-energy (SEC Form 10-Q, Q2 2026) ↗ · Open in the ledger · What this does and does not establish · source read 11 November 2026
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