Exhibit 23.7 CONSENT OF SG BARR DEVLIN We hereby consent to the use of our opinion in the Joint Proxy Statement/Prospectus of Consolidated Edison, Inc. and Northeast Utilities included in this Registration Statement of Consolidated Edison, Inc. and to all references to our firm included in or made a part of this Registration Statement. In giving such consent, we do not thereby admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations adopted by the Securities and Exchange Commission thereunder. SG BARR DEVLIN A division of SG Cowen Securities Corporation New York, New York February 29, 2000