Company: HYNLY
Filing Date: 2025-02-20
Form Type: 40-F
Source: 0001712356-25-000012
Chunk: 2

Company: Hydro One Ltd
Filing Date: 2025-02-20
Form: 40-F
Chunk 2
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1934, as amended (the “Exchange Act”), to mean controls and other procedures of an issuer that are designed to ensure that information required to be disclosed by an issuer in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the United States Securities and Exchange Commission’s (the “Commission”) rules and forms.

At the direction of Hydro One Limited’s (the “Registrant”) Chief Executive Officer and Chief Financial Officer, management evaluated disclosure controls and procedures as of the end of the period covered by this report. Based on that evaluation, management concluded that the Registrant’s disclosure controls and procedures were effective as at December 31, 2024.

See the disclosure provided under the heading “Disclosure Controls and Procedures and Internal Control over Financial Reporting” on page 36 of Exhibit 99.3, the Registrant’s Management’s Discussion and Analysis (the “MD&A”) which is incorporated by reference herein.

Management’s Annual Report on Internal Control over Financial Reporting and Attestation Report of the Registered Public Accounting Firm

Management is responsible for establishing and maintaining adequate disclosure controls and procedures and internal control over financial reporting as described in the MD&A. Management evaluated the effectiveness of the design and operation of internal control over financial reporting based on the framework and criteria established in the Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on that evaluation, management concluded that the Registrant's internal control over financial reporting was effective as of December 31, 2024.

Internal control, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives and due to its inherent limitations, may not prevent or detect all misrepresentations. Furthermore, the effectiveness of internal control is affected by change and subject to the risk that internal control effectiveness may change over time.

This annual report does not include an attestation report of the Registrant’s registered public accounting firm regarding internal control over financial reporting.

The report of management on our internal control over financial reporting is provided under the heading “Management’s Report” in the Registrant’s audited consolidated financial statements, which is filed as Exhibit 99.2 and is incorporated by reference herein.

### Changes in Internal Control Over Financial Reporting
There were no significant changes in the design of the Registrant’s internal control over financial reporting during the year ended December 31, 2024 that have materially affected, or are reasonably likely