EXHIBIT 12 COMPUTATION IN SUPPORT OF RATIO OF EARNINGS TO FIXED CHARGES For the Three Months Ended March 31, 2001 (Dollar Amounts in Thousands) Monongahela Power Earnings: Net income $ 30,089 Plus: Fixed charges (see below) 14,649 Income taxes 19,037 Amort of capitalized interest 4 Income distributions of equity investee 2,160 Less: Capitalized interest (275) Inc from unconsolidated equity investee (1,488) Total Earnings $ 64,176 Fixed Charges: Interest on long-term debt $ 12,834 Other interest 692 Estimated interest component of rentals 1,123 Total Fixed Charges $ 14,649 Ratio of Earnings to Fixed Charges 4.38