Hydro One union ratifies new contract through 2028

Hydro One Limited filed a 6-K to share that members of the Society of United Professionals have ratified a new collective agreement for Hydro One Inc. employees.

Rhea-AI Filing Summary

Hydro One Limited filed a 6-K to share that members of the Society of United Professionals have ratified a new collective agreement for Hydro One Inc. employees. The contract is retroactive from October 1, 2025 and runs to March 31, 2028, covering engineering, supervisory and other professional roles across its Ontario operations.

Hydro One highlights its scale as Ontario’s largest electricity transmission and distribution provider, serving 1.5 million customers, with $36.7 billion in assets as of December 31, 2024 and $8.5 billion of 2024 revenues. In 2024 it invested $3.1 billion in its networks and purchased $2.9 billion of goods and services, supported by a workforce of 10,100 employees.

FAQ

What did Hydro One Limited (HRNNF) announce in this 6-K filing?

Hydro One Limited disclosed that members of the Society of United Professionals ratified a new collective agreement for Hydro One Inc. employees. The deal covers engineering, supervisory and other professional roles across Ontario and is retroactive from October 1, 2025 through March 31, 2028.

Who is covered by Hydro One’s new Society of United Professionals agreement?

The ratified agreement covers Society of United Professionals members working at Hydro One Inc. It applies to employees in engineering, supervisory and other professional positions across Hydro One’s Ontario operations, recognizing their contributions while aligning with the company’s focus on delivering value and reliability for customers.

What is the term of Hydro One’s new union agreement with Society members?

The new agreement is effective retroactively from October 1, 2025 and runs until March 31, 2028. This multi-year term provides labor stability for Hydro One’s engineering, supervisory and professional staff across Ontario during that period, following ratification by Society of United Professionals members.

How large is Hydro One Limited (HRNNF) based on the figures disclosed?

Hydro One Limited describes itself as Ontario’s largest electricity transmission and distribution provider, serving 1.5 million customers. It reports $36.7 billion in assets as of December 31, 2024, 2024 annual revenues of $8.5 billion, and a workforce of 10,100 employees supporting its network.

How much did Hydro One invest in its networks and suppliers in 2024?

In 2024, Hydro One invested $3.1 billion in its transmission and distribution networks. It also supported the broader economy by purchasing $2.9 billion of goods and services, illustrating ongoing infrastructure spending and procurement tied to its electricity operations across Ontario.

On which exchanges are Hydro One Limited securities traded?

Hydro One Limited states that its common shares are listed on the Toronto Stock Exchange. It also notes that certain Hydro One Inc. medium term notes are listed on the New York Stock Exchange, providing access to both Canadian equity and U.S. debt capital markets.

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Accepted by SEC EDGAR 01/30/2026 - 07:40 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16 or 15d-16

under the Securities Exchange Act of 1934

For the month of: January 2026

Commission File Number: 333-225519-01

HYDRO ONE LIMITED

(Translation of Registrant’s name into English)

483 Bay Street, South Tower, 8th Floor, Toronto Ontario M5G 2P5 Canada

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☐   Form 40-F ☒

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

HYDRO ONE LIMITED

/s/ Cassidy McFarlane

Name: Cassidy McFarlane

Title: General Counsel

Date: January 30, 2026

EXHIBIT INDEX

99.1 News Release dated January 30, 2026

Exhibit 99.1

Members of the Society of United Professionals ratify collective agreement

TORONTO, January 30, 2026 - Hydro One Inc. (Hydro One) is pleased to announce that Society of United Professionals (Society) members have ratified the tentative agreement reached on January 12, 2026. The new agreement will take effect retroactively from October 1, 2025 to March 31, 2028 and covers employees in engineering, supervisory and other professional roles, across Hydro One’s operations in Ontario.

“Thank you to the Society leadership and the bargaining teams for their efforts to reach a fair and balanced outcome,” said David Lebeter, President and Chief Executive Officer, Hydro One. “This agreement recognizes the important contributions of our employees while ensuring we remain focused on delivering value and reliability for our customers.”

Hydro One Limited (TSX: H)

Hydro One Limited, through its wholly-owned subsidiaries, is Ontario’s largest electricity transmission and distribution provider with 1.5 million valued customers, $36.7 billion in assets as at December 31, 2024, and annual revenues in 2024 of $8.5 billion.

Our team of 10,100 skilled and dedicated employees proudly build and maintain a safe and reliable electricity system which is essential to supporting strong and successful communities. In 2024, Hydro One invested $3.1 billion in its transmission and distribution networks, and supported the economy through buying $2.9 billion of goods and services.

We are committed to the communities where we live and work through community investment, sustainability and diversity initiatives.

Hydro One Limited’s common shares are listed on the TSX and certain of Hydro One Inc.’s medium term notes are listed on the NYSE. Additional information can be accessed at www.hydroone.com, www.sedarplus.com or www.sec.gov.

For More Information

For more information about everything Hydro One, please visit www.hydroone.com where you can find additional information including links to securities filings, historical financial reports, and information about the Company’s governance practices, corporate social responsibility, customer solutions, and further information about its business.

Forward-looking statements and information:

This press release may contain “forward-looking information” within the meaning of applicable Canadian securities laws and “forward-looking statements” within the meaning of applicable U.S. securities laws (collectively, “forward-looking information”). Statements containing forward-looking information are made pursuant to the “safe harbour” provisions of applicable Canadian and U.S. securities laws. Words such as “expect”, “anticipate”, “intend”, “attempt”, “may”, “plan”, “will”, “can”, “believe”, “seek”, “estimate”, and variations of such words and similar expressions are intended to

identify such forward-looking information. These statements are not guarantees of future performance or actions and involve assumptions and risks and uncertainties that are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expressed, implied or forecasted in such forward-looking information. Some of the factors that could cause actual results or outcomes to differ materially from the results expressed, implied or forecasted by such forward-looking information, including some of the assumptions used in making such statements, are discussed more fully in Hydro One’s filings with the securities regulatory authorities in Canada, which are available on SEDAR+ at www.sedarplus.com. Hydro One does not intend, and it disclaims any obligation, to update any forward-looking information, except as required by law.

For further information:

Media can contact Hydro One Media Relations 24 hours a day at 1-877-506-7584 (toll-free in Ontario only) or 416-345-6868