Exhibit 99.8

Consent of Report of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in Registration Statements Nos. 333-215777 on Form S-8, 333-214787 on Form F-10, and 333-218032 on Form F-3 and to the use of our reports dated February 14, 2018 relating to the consolidated financial statements of Fortis Inc. and subsidiaries and the effectiveness of Fortis Inc.’s internal control over financial reporting appearing in this Annual Report on Form 40-F of Fortis Inc. for the year ended December 31, 2017.

/s/ Deloitte LLP    

Chartered Professional Accountants

St. John’s, Canada

February 14, 2018