6-K

SECURITIES AND EXCHANGECOMMISSION

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: April 2025

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.

EXHIBIT INDEX

EX-99.1

Exhibit 99.1

Tim Hodgson resigns as Chair of the Board of Directors

TORONTO, April 29, 2025—Hydro One Limited announced today that Tim Hodgson has resigned from his position as Chair of the Board of the Directors after successfully running in the federal election, during which time he was on an unpaid leave of absence.

The Board of Directors has launched a process to select a new Chair. In the interim, Susan Wolburgh Jenah will continue to serve as Interim Chair of the Board and as Chair of the Governance and Regulatory Committee.

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Hydro One Limited (TSX: H)

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

Our team of approximately 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 approximately $3.1 billion in its transmission and distribution networks, and supported the economy through buying approximately $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 further information, please contact:

Investors: investor.relations@hydroone.com or 416-345-5943 ****

Media: Media.relations@hydroone.com or 416-345-6868