X0202 4 2006-04-05 0 0000003673 ALLEGHENY ENERGY, INC AYE 0001322841 Park Hyun C/O ALLEGHENY ENERGY, INC. 800 CABIN HILL DRIVE GREENSBURG PA 15601 0 1 0 0 Vice Pres. & General Counsel Common Stock, $1.25 par value per share 2006-04-05 4 M 0 10000 34.355 A 10000 D Common Stock, $1.25 par value per share 2006-04-05 4 F 0 3389 34.355 D 6611 D Stock Units 2006-04-05 4 M 0 10000 D Common Stock 10000 40000 D Represents shares of the Issuer's Common Stock issued to Mr. Park in connection with the vesting of Stock Units. Calculated based on the average of the high and low sales prices for a share of the Issuer's Common Stock on the New York Stock Exchange on April 5, 2006. Shares of the Issuer's Common Stock withheld as payment for required minimum federal, state and local tax withholdings. Mr. Park was granted 50,000 Stock Units on April 5, 2005. One-fifth of the Stock Units vested on April 5, 2006. The remaining Stock Units will vest in equal installments on each April 5 from 2007 through 2010, provided that Mr. Park is an employee of the Issuer on the applicable vesting date. The Issuer pays holders of Stock Units the full value of each vested Stock Unit on each applicable vesting date in stock, subject to the holder's election to defer payments, if any. /s/ Amanda J. Skov, Attorney-in-Fact 2006-04-07