X0306 4 2020-03-31 0 0001419242 ATLANTIC POWER CORP AT 0001333101 Howell Kevin C/O ATLANTIC POWER CORPORATION 3 ALLIED DRIVE, SUITE 155 DEDHAM MA 02026 1 0 0 0 Deferred share units 2020-03-31 4 A 0 10021 2.06 A Common shares 10021 149446 D Deferred share units are granted under the Company's Deferred Share Unit Plan, which provides for the payment of all accrued deferred share units to the reporting person following his or her termination as a director. Each deferred share unit is equal to the economic equivalent of one common share. /s John S. Miele, attorney-in-fact 2020-04-01