X0306 4 2014-02-28 0 0001419242 ATLANTIC POWER CORP AT 0001487813 Welch Barry Edward C/O ATLANTIC POWER CORPORATION ONE FEDERAL STREET, 30TH FLOOR BOSTON MA 02110 1 1 0 0 Chief Executive Officer Notional shares 2014-02-28 4 A 0 227273 A Common shares 227273 251942 D Represents a grant of notional shares pursuant to the Company's Long-Term Incentive Plan ("LTIP") in 2014 in respect of the 2013 performance year that vest ratably with respect to one-third on each of February 28, 2015, February 28, 2016 and February 28, 2017. Under the LTIP, each notional share represents a right to receive one-third in cash, which will be deposited into the reporting persons applicable payroll tax withholding account, and the remainder in common shares. The amount of securities beneficially owned following the reported transactions reflect those holdings as of the date of this Form. The total includes dividend equivalent rights accrued on the notional shares previously earned pursuant to the LTIP. Dividend equivalent rights are credited in notional shares. /s/Barry E. Welch 2014-03-21