Exhibit 23.1.7

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-233896-01on Form S-3 of our report dated February 20, 2020, relating to the consolidated financial statements of Piedmont Natural Gas, Inc. and subsidiaries appearing in this Annual Report on Form 10-K of Piedmont Natural Gas, Inc. for the year ended December 31, 2019.

/s/ Deloitte & Touche LLP

Charlotte, North Carolina

February 20, 2020