Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated February 14, 2018, relating to the consolidated financial statements of Fortis Inc. and subsidiaries (the “Corporation”) and the effectiveness of the Corporation’s internal control over financial reporting, appearing in the Corporation’s Annual Report on Form 40-F for the year ended December 31, 2017.

/s/ Deloitte LLP

St. John’s, Canada

August 8, 2018