X0202 4 2006-03-31 0 0000003673 ALLEGHENY ENERGY, INC AYE 0001222260 SERKES JEFFREY D C/O ALLEGHENY ENERGY, INC. 800 CABIN HILL DRIVE GREENSBURG PA 15601 0 1 0 0 Sr. VP & Chief Fin. Officer Common Stock, $1.25 par value 2006-03-31 4 M 0 107218 34.17 A 160372 D Common Stock, $1.25 par value 2006-03-31 4 F 0 40124 34.17 D 120248 D Common Stock, $1.25 par value 682.4833 I ESOSP Stock Units 2006-03-31 4 M 0 107218 D Common Stock 107218 559923 D Represents shares of the Issuer's Common Stock issued to Mr. Serkes in connection with the vesting Stock Units. Calculated based on the average of the high and low sale prices for a share of the Issuer's Common Stock on the New York Stock Exchange on March 31, 2006. Shares of the Issuer's Common Stock withheld as payment for minimum federal, state and local tax withholdings required. Held through the Allegheny Energy, Inc. Employee Stock Ownership and Savings Plan. Mr. Serkes was granted 714,795 Stock Units on February 18, 2004. One-third of the Stock Units vested on July 3, 2004 and one-third vested on July 3, 2005. The remaining one-third will vest on July 3, 2006, provided that Mr. Serkes is an employee of the Issuer on that date. The Issuer pays holders of Stock Units the full value of each vested Stock Unit in shares of its Common Stock, subject to the holder's election to defer payments, if any. With respect to the Stock Units that vested on July 3, 2004, Mr. Serkes elected to receive 23,827 of the underlying shares on July 3, 2004 and to defer his receipt of the remaining 214,438 shares until July 3, 2006. With respect to the Stock Units that vested on July 3, 2005, Mr. Serkes elected to receive 23,827 of the underlying shares on July 3, 2005 and to defer his receipt of (a) 107,218 shares until March 31, 2006 and (b) 107,220 shares until January 2, 2007. /s/ Amanda J. Skov, Attorney-in-Fact 2006-04-04