EXHIBIT 12 COMPUTATION IN SUPPORT OF RATIO OF EARNINGS TO FIXED CHARGES For Year Ended December 31, 1998 (Dollar Amounts in Thousands) Allegheny Generating Company Earnings: Net Income $ 22,753 Fixed charges (see below) 13,987 Income taxes 11,006 Total earnings $ 47,746 Fixed Charges: Interest on long-term debt $ 10,848 Other interest 3,139 Estimated interest component of rentals --- Total fixed charges $ 13,987 Ratio of Earnings to Fixed Charges 3.41