EXHIBIT 99.1 WASHINGTON GAS LIGHT COMPANY AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS Twelve Months Ended March 31, 2000 (Unaudited) (Dollars in Thousands) PRE-TAX PREFERRED STOCK DIVIDENDS Preferred Dividends $ 1,328 Effective Income Tax Rate 0.3689 Complement of Effective Income Tax Rate (1 - Tax Rate) 0.6311 Pre-Tax Preferred Dividends $ 2,104 ============= FIXED CHARGES Interest Expense $ 39,820 Amortization of Debt Premium, Discount and Expense 505 Interest Component of Rentals 12 ------------- Total Fixed Charges 40,337 Pre-tax Preferred Dividends 2,104 ------------- Total $ 42,441 ============= EARNINGS Net Income $ 84,031 Add: Income Taxes Applicable to Utility Operating Income 44,250 Income Taxes Applicable to Non-Utility Operating Income 5,465 Income Taxes Applicable to Other Income (Expenses)--Net (604) Total Fixed Charges 40,337 ------------- Total Earnings $ 173,479 ============= Ratio of Earnings to Fixed Charges and Preferred Stock Dividends 4.1 ============= - 1 -