Hydro One 6-K Hydro One submits $5 billion investment plan to the Ontario Energy Board to keep Ontario’s

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM6-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: March 2019

Commission File Number:001-36115

HYDRO ONE INC.

(Translation of Registrant’s name into English)

483 Bay Street, South, 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 Form20-F or Form40-F.

Form20-F    ☐                Form40-F    ☒

Indicate by check mark if the registrant is submitting the Form6-K in paper as permitted by RegulationS-T Rule 101(b)(1):    ☐

Indicate by check mark if the registrant is submitting the Form6-K in paper as permitted by RegulationS-T Rule 101(b)(7):    ☐

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 INC.

/s/ James Scarlett

Name: James Scarlett

Title: Chief Legal Officer

Date: March 21, 2019

EXHIBIT INDEX

99.1 Hydro One Inc. news release dated March 21, 2019.