Exhibit 16 March 22, 2002 Office of the Chief Accountant Securities and Exchange Commission 450 Fifth Street, N.W. Washington, D.C. 20549 Dear Sir: We have read paragraphs 1 and 3 through 5 of Item 4included in the Form 8-K dated March 15, 2002 of the Public Service Company of New Hampshire filed with the Securities and Exchange Commission and are in agreement with the statements contained therein. Very truly yours, /s/ ARTHUR ANDERSEN LLP cc: Mr. John H. Forsgren Vice Chairman, Executive Vice President and Chief Financial Officer Northeast Utilities