Hydro One 40-F 2015 FY Annual report (Canada)

Exhibit 99.4

KPMG LLP Bay Adelaide Centre 333 Bay Street Suite 4600 Toronto ON M5H 2S5 Telephone    (416) 777-8500 Fax               (416) 777-8818 Internet         www.kpmg.ca

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Hydro One Inc.

We consent to the use of our report, dated February 11, 2016, with respect to the consolidated financial statements included in this annual report on Form 40-F.

Chartered Professional Accountants, Licensed Public Accountants

March 22, 2016

Toronto, Canada

KPMG LLP is a Canadian limited liability partnership and a member firm of the KPMG

network of independent member firms affiliated with KPMG International Cooperative

(“KPMG International”), a Swiss entity.

KPMG Canada provides services to KPMG LLP.