13 Exhibit 23.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements on Forms S-3 (File Nos. 333-55890 and 33-57840) of Boston Edison Company of our report dated January 26, 2001 relating to the financial statements and the financial statement schedule, which appear in this Form 10-K. PricewaterhouseCoopers LLP Boston, Massachusetts January 26, 2001