<ARTICLE> UT <MULTIPLIER> 1,000 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> JUN-30-1997 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 2,987,432 <OTHER-PROPERTY-AND-INVEST> 780,016 <TOTAL-CURRENT-ASSETS> 452,361 <TOTAL-DEFERRED-CHARGES> 96,847 <OTHER-ASSETS> 288,327 <TOTAL-ASSETS> 4,604,983 <COMMON> 284,042 <CAPITAL-SURPLUS-PAID-IN> 507,741 <RETAINED-EARNINGS> 727,081 <TOTAL-COMMON-STOCKHOLDERS-EQ> 1,518,864 <PREFERRED-MANDATORY> 25,000 <PREFERRED> 78,475 <LONG-TERM-DEBT-NET> 1,175,734 <SHORT-TERM-NOTES> 1,000 <LONG-TERM-NOTES-PAYABLE> 238,312 <COMMERCIAL-PAPER-OBLIGATIONS> 0 <LONG-TERM-DEBT-CURRENT-PORT> 48,188 <PREFERRED-STOCK-CURRENT> 0 <CAPITAL-LEASE-OBLIGATIONS> 96,492 <LEASES-CURRENT> 6,670 <OTHER-ITEMS-CAPITAL-AND-LIAB> 1,416,248 <TOT-CAPITALIZATION-AND-LIAB> 4,604,983 <GROSS-OPERATING-REVENUE> 1,009,411 <INCOME-TAX-EXPENSE> 66,890 <OTHER-OPERATING-EXPENSES> 787,886 <TOTAL-OPERATING-EXPENSES> 854,776 <OPERATING-INCOME-LOSS> 154,635 <OTHER-INCOME-NET> 5,962 <INCOME-BEFORE-INTEREST-EXPEN> 160,597 <TOTAL-INTEREST-EXPENSE> 55,353 <NET-INCOME> 105,244 <PREFERRED-STOCK-DIVIDENDS> 0 <EARNINGS-AVAILABLE-FOR-COMM> 105,244 <COMMON-STOCK-DIVIDENDS> 91,047 <TOTAL-INTEREST-ON-BONDS> 35,933 <CASH-FLOW-OPERATIONS> 286,496 <EPS-PRIMARY> .91 <EPS-DILUTED> .91