EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 333-212616 and No. 333-208571) on Form S-8 and (No. 333-270658) on Form S-3 of our reports dated February 22, 2024, with respect to the consolidated financial statements (and financial statement schedule I) of Avangrid, Inc. and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

New York, New York

February 22, 2024