EXHIBIT 15 May 6, 1994 To Northeast Utilities: We are aware that Northeast Utilities has incorporated by reference in its Registration Statement No. 33-34622 and No. 33- 40156 its Form 10-Q for the quarter ended March 31, 1994, which includes our report dated May 6, 1994 covering the unaudited interim financial information contained therein. Pursuant to Regulation C of the Securities Act of 1933, that report is not considered a part of the registration statement prepared or certified by our firm within the meaning of Sections 7 and 11 of the Act. Very truly yours, ARTHUR ANDERSEN & CO. Arthur Andersen & Co.