X0303 4 2010-03-22 0 0000003673 ALLEGHENY ENERGY, INC AYE 0001428312 Pappas Christopher D C/O ALLEGHENY ENERGY, INC. 800 CABIN HILL DRIVE GREENSBURG PA 15601 1 0 0 0 Common Stock, $1.25 par value 2010-03-22 4 A 0 44.861 A 10169.146 D Common Stock, $1.25 par value 2010-03-22 4 P 0 26.525 23.26 A 10195.671 D Phantom Stock 2010-03-22 4 A 0 9.324 A Common Stock 9.324 1467.583 D Issued in connection with the payment of a dividend on the Issuer's common stock, par value $1.25 per share (the "Common Stock") with respect to shares of Common Stock that Mr. Pappas has elected to defer under the Issuer's Revised Plan for Deferral of Compensation of Directors. Purchased pursuant to a pre-existing, written arrangement for the reinvestment of dividends. Under the Issuer's Revised Plan for Deferral of Compensation of Directors, non-employee members of the Issuer's Board of Directors (the "Board") may elect to defer receipt of all or a part of the cash portion of the director fees to which they become entitled in connection with their service on the Board and may opt to invest all or a portion of any such deferred amounts into a phantom stock fund maintained by the Issuer. Mr. Pappas previously elected to defer receipt of all of the cash portion of the fees payable to her and to invest such deferred amounts in the Issuer's phantom stock fund. Dividends on such deferred amounts are paid in additional units of phantom stock. Each unit of phantom stock is the economic equivalent of one share of Common Stock. The units of phantom stock are payable in cash upon the terminatino of Mr. Pappas's service on the Board. Amanda J. Skov Attorney-in-Fact 2010-03-24