EXHIBIT 99.1 WASHINGTON GAS LIGHT COMPANY AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS Twelve Months Ended June 30, 2000 (Unaudited) (Dollars in Thousands) PRE-TAX PREFERRED STOCK DIVIDENDS Preferred Dividends $ 1,326 Effective Income Tax Rate 0.3701 Complement of Effective Income Tax Rate (1 - Tax Rate) 0.6299 Pre-Tax Preferred Dividends $ 2,105 ============ FIXED CHARGES Interest Expense $ 41,347 Amortization of Debt Premium, Discount and Expense 456 Interest Component of Rentals 12 ------------ Total Fixed Charges 41,815 Pre-tax Preferred Dividends 2,105 ------------ Total $ 43,920 ============ EARNINGS Net Income $ 85,500 Add: Income Taxes Applicable to Utility Operating Income 46,904 Income Taxes Applicable to Non-Utility Operating Income 4,204 Income Taxes Applicable to Other Income (Expenses)--Net (883) Total Fixed Charges 41,815 ------------ Total Earnings $ 177,540 ============ Ratio of Earnings to Fixed Charges and Preferred Stock Dividends 4.0 ============