<ARTICLE> UT
<LEGEND>
This schedule contains summary financial information extracted from the
related Form 10-K 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>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<EXCHANGE-RATE>                                      1
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    9,093,341
<OTHER-PROPERTY-AND-INVEST>                  2,702,734
<TOTAL-CURRENT-ASSETS>                       1,301,676
<TOTAL-DEFERRED-CHARGES>                     5,126,296
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                              18,224,047
<COMMON>                                        23,245
<CAPITAL-SURPLUS-PAID-IN>                    3,595,404
<RETAINED-EARNINGS>                            945,241
<TOTAL-COMMON-STOCKHOLDERS-EQ>               4,563,890
<PREFERRED-MANDATORY>                          256,246
<PREFERRED>                                    648,395
<LONG-TERM-DEBT-NET>                         6,001,264
<SHORT-TERM-NOTES>                             257,845
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                 159,974
<LONG-TERM-DEBT-CURRENT-PORT>                  668,837
<PREFERRED-STOCK-CURRENT>                       38,464
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                55,219
<OTHER-ITEMS-CAPITAL-AND-LIAB>               5,573,913
<TOT-CAPITALIZATION-AND-LIAB>               18,224,047
<GROSS-OPERATING-REVENUE>                    6,319,647
<INCOME-TAX-EXPENSE>                           394,827
<OTHER-OPERATING-EXPENSES>                   4,784,228
<TOTAL-OPERATING-EXPENSES>                   5,179,055
<OPERATING-INCOME-LOSS>                      1,140,592
<OTHER-INCOME-NET>                                   0
<INCOME-BEFORE-INTEREST-EXPEN>               1,140,592
<TOTAL-INTEREST-EXPENSE>                       572,293
<NET-INCOME>                                   568,299
<PREFERRED-STOCK-DIVIDENDS>                          0
<EARNINGS-AVAILABLE-FOR-COMM>                        0
<COMMON-STOCK-DIVIDENDS>                       341,467
<TOTAL-INTEREST-ON-BONDS>                      477,059
<CASH-FLOW-OPERATIONS>                       1,488,306
<EPS-BASIC>                                       2.50
<EPS-DILUTED>                                     2.50