X0202 4 2006-04-03 0 0001062379 KEYSPAN CORP KSE 0001195331 LUTERMAN GERALD ONE METROTECH CENTER BROOKLYN NY 11201 0 1 0 0 Executive Officer Deferred Stock Unit 2006-04-03 4 A 0 4746.711 40.90 A Common Stock 4746.711 395496.857 D Deferred Stock Unit 2006-04-03 4 A 0 949.342 40.90 A Common Stock 949.342 396446.200 D The security converts to Keyspan common stock on a one-for-one basis. The reporting person received deferred stock units pursuant to the Officers Deferred Stock Unit Plan by deferring a portion of their award pursuant to the Annual Incentive Compensation Plan. The deferred stock units track the performance of KeySpan common stock and are generally payable in KeySpan common stock, except in the case of a change of control which results in a cash payment. The reporting person received deferred stock units based upon a 20% match provided by the Company. These deferred stock units track the performance of the Company's common stock and are payable in cash upon retirement, disabilty, death, change in control, but not resignation. /s/Colleen A. Meade, as Attorney in Fact 2006-04-05