<ARTICLE> UT <LEGEND> This schedule contains summary financial information extracted from the related Form 10-Q financial statements for FirstEnergy Corp. and is qualified in its entirety by reference to such financial statements. (Amounts in 1,000's, except earnings per share.) </LEGEND> <CIK> 0001031296 <NAME> FIRSTENERGY CORP. <MULTIPLIER> 1,000 <CURRENCY> U.S. DOLLARS <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> MAR-31-1999 <EXCHANGE-RATE> 1 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 9,219,634 <OTHER-PROPERTY-AND-INVEST> 2,416,743 <TOTAL-CURRENT-ASSETS> 1,085,249 <TOTAL-DEFERRED-CHARGES> 5,466,737 <OTHER-ASSETS> 0 <TOTAL-ASSETS> 18,188,363 <COMMON> 23,553 <CAPITAL-SURPLUS-PAID-IN> 3,667,052 <RETAINED-EARNINGS> 768,993 <TOTAL-COMMON-STOCKHOLDERS-EQ> 4,459,598 <PREFERRED-MANDATORY> 294,710 <PREFERRED> 660,195 <LONG-TERM-DEBT-NET> 6,335,289 <SHORT-TERM-NOTES> 145,769 <LONG-TERM-NOTES-PAYABLE> 0 <COMMERCIAL-PAPER-OBLIGATIONS> 119,965 <LONG-TERM-DEBT-CURRENT-PORT> 742,822 <PREFERRED-STOCK-CURRENT> 40,154 <CAPITAL-LEASE-OBLIGATIONS> 0 <LEASES-CURRENT> 58,537 <OTHER-ITEMS-CAPITAL-AND-LIAB> 5,331,324 <TOT-CAPITALIZATION-AND-LIAB> 18,188,363 <GROSS-OPERATING-REVENUE> 1,417,410 <INCOME-TAX-EXPENSE> 92,925 <OTHER-OPERATING-EXPENSES> 1,041,687 <TOTAL-OPERATING-EXPENSES> 1,134,612 <OPERATING-INCOME-LOSS> 282,798 <OTHER-INCOME-NET> 0 <INCOME-BEFORE-INTEREST-EXPEN> 282,798 <TOTAL-INTEREST-EXPENSE> 146,077 <NET-INCOME> 136,721 <PREFERRED-STOCK-DIVIDENDS> 0 <EARNINGS-AVAILABLE-FOR-COMM> 0 <COMMON-STOCK-DIVIDENDS> 86,138 <TOTAL-INTEREST-ON-BONDS> 511,753 <CASH-FLOW-OPERATIONS> 212,630 <EPS-PRIMARY> .60 <EPS-DILUTED> .60