Company: HYNLY
Filing Date: 2025-05-08
Form Type: 6-K
Source: 0001712356-25-000025
Chunk: 0

Company: Hydro One Ltd
Filing Date: 2025-05-08
Form: 6-K
Chunk 0
---
### 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: May 2025

#### Commission File Number: 333-225519-01

### HYDRO ONE LIMITED
<div align='center'>(Translation of Registrant’s name into English)

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

(Address of principal executive offices)</div>

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

<div align='center'>Form 20-F ☐ Form 40-F ☒</div>

### EXHIBIT INDEX
| 99.1 
 99.2 |     | Unaudited interim consolidated financial statements of the Registrant as at and for the three months ended March 31, 2025 and 2024 
 Management’s Discussion and Analysis of the Registrant as at and for the three months ended March 31, 2025 and 2024                |
|:-----|:----|:-----------------------------------------------------------------------------------------------------------------------------------|
| 99.3 |     | Certification of President and Chief Executive Officer                                                                             |
| 99.4 |     | Certification of Executive Vice President, Chief Financial and Regulatory Officer                                                  |

### 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/ Harry Taylor                                                          |     |             |
| Name: Harry Taylor                                                        |     |             |
| Title:   Executive Vice President, Chief Financial and Regulatory Officer |     |             |
| Date:                                                                     |     | May 8, 2025 |