EXHIBIT 12 COMPUTATION IN SUPPORT OF RATIO OF EARNINGS TO FIXED CHARGES For the Three Months Ended March 31, 2001 (Dollar Amounts in Thousands) Allegheny Energy, Inc. Earnings: Net income * $ 100,514 Plus: Fixed charges (see below) 67,191 Income taxes * 67,546 Amort of capitalized interest 44 Equity in Earnings - Ventures 604 Less: Capitalized interest (1,140) Total Earnings $ 234,759 Fixed Charges: Interest on long-term debt $ 49,478 Other interest 14,164 Estimated interest component of rentals 3,549 Total Fixed Charges $ 67,191 Ratio of Earnings to Fixed Charges 3.49 * Net Income and income taxes excludes accounting changes