Monday, September 14, 2026
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Monday, September 14, 2026 Admin

CCO.TO ·

News release

Mergers & Acquisitions

Saskatoon

Saskatchewan

Canada

supplement dated November 12, 2024, to its short form base shelf prospectus dated November 12, 2024.

US Department of Energy to Jumpstart Nuclear Supply Chain and Accelerate

Deployment of Westinghouse AP1000® reactors

June 23, 2026

Cameco Corporation (TSX: CCO; NYSE: CCJ) welcomes the US Department of

Energy (DOE) Office of Energy Dominance Financing (EDF) regarding its conditional commitment for the

American Nuclear Supply Chain Loans to reenergize the large-scale nuclear reactor supply chain, drive down

costs and accelerate the deployment of AP1000 reactors in the US and globally. The DOE

commitment for a loan package of up to US$17.5 billion is expected to provide the majority of the financing for

Westinghouse Electric Company (Westinghouse) to purchase the long-lead time items for up to 10 AP1000

nuclear reactors in the United States.

capacity using the proven AP1000 reactor technology,

the May 23, 2025 Executive Orders and other US government initiatives, we believe the right incentives are being

created to advance the rapid deployment of AP1000 reactors in the US. The expansion of nuclear power in the

United States is expected to create significant opportunities for Westinghouse and Cameco, accelerating growth

procurement and subsequent construction phase.

While this

Westinghouse, its owners, and its partners must satisfy certain technical, legal, environmental, and financial

conditions before DOE enters into definitive financing documents and funds the loan.

Background

Brookfield Renewable Partners (Brookfield) and Cameco acquired Westinghouse in November 2023. The

We expect the DOE loan arrangement to be implemented through a special purpose vehicle of Westinghouse

(SPV) that will administer the loan funding for up to five project funding vehicles jointly owned by Westinghouse

and the applicable partner for the procurement of the long-lead items at a fixed price for two reactors per project.

Both the SPV and the approved partner are required to fully commit their project equity totaling approximately

$500 million each or $1 billion per project upfront prior to accessing DOE loan funds. As approved partners reach

NEWS RELEASE

All amounts in Canadian dollars

unless specified otherwise

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final investment decisions for the applicable projects, the DOE loan is expected to be repaid from the proceeds of

the sale of the long-lead items.

The loan package arrangements contemplated by the conditional commitment are subject to, among other risks,

the factors discussed below under Forward Looking Information and remain subject to

Westinghouse, its owners, and its partners satisfying certain technical, legal, environmental, and financial

conditions with DOE, negotiation and completion of definitive agreements, any required approvals, and other

customary conditions. There can be no assurance that definitive agreements will be entered into or that the

proposed loan package will be completed on the terms currently contemplated, or at all.

We are separately advancing discussions on the strategic partnership entered into among Brookfield, Cameco and

the US Department of Commerce in October 2025.

Caution about Forward-Looking Information

expectations for the future, which we refer to as forward-looking

information. Forward-

identify forward-looking information. Forward- current views, which can change significantly, and

actual results and events may be significantly different from what we currently expect. Examples of forward-looking information in this news

release include: the entering into the loan package of up to US$17.5 billion, the expected initiation of orders for long-lead items, the

commitment of project equity, the expected repayment of the DOE loan from the proceeds of the sale of long-lead items, and the

negotiation and execution of definitive agreements, satisfaction of closing conditions and any required approvals.

Material risks that could lead to different results include: the risk that definitive agreements are not entered into, that required approvals are

not obtained, that conditions to completion including required technical, legal, environmental and financial conditions are not satisfied, that

the proposed financing terms change materially, or that the proposed transaction is not completed.

In presenting the forward-looking information, Cameco has made material assumptions which may prove incorrect about the ability of the

parties to negotiate and execute definitive agreements, obtain any required approvals, satisfy closing conditions, and complete the

proposed transaction on acceptable terms or at all.

5 annual MD&A, 2026 first quarter MD&A and most recent annual information form for

terial

assumptions we have made. We will not necessarily update this information unless we are required to by securities laws.

Profile

Cameco is one of the largest global providers of the uranium fuel needed to power a secure energy future. Our competitive position is based

-grade reserves and low-cost operations, as well as significant investments across

the nuclear fuel cycle, including ownership interests in Westinghouse Electric Company and Global Laser Enrichment. Utilities around the

world rely on Cameco to provide global nuclear fuel solutions for the generation of safe, reliable, carbon-free nuclear power. Our shares

trade on the Toronto and New York stock exchanges. Our head office is in Saskatoon, Saskatchewan, Canada.

As used in this news release, the terms we, us, our, the Company and Cameco mean Cameco Corporation and its subsidiaries unless

otherwise indicated.

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Investor inquiries Media inquiries

Cory Kos Veronica Baker

306-716-6782 306-385-5541

[email protected] [email protected]