Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-224669 on Form S-3 of our report dated November 19, 2018 (March 1, 2019, as to the effects of the adoption of ASU2017-07 during the three months ended December 31, 2018) relating to the financial statements of Washington Gas Light Company, appearing in this Annual Report on Form 10-K of Washington Gas Light Company for the year ended December 31, 2019.

/s/ Deloitte & Touche LLP

McLean, Virginia

February 28, 2020