Third Quarter 2019 Financial Highlights

Atlantic Power Corporation (NYSE: AT) (TSX: ATP) ("Atlantic Power" or the "Company") plans to release its financial results for the three and nine months ended September 30, 2019 after the market closes on the afternoon of Thursday, October 31, 2019. A telephone conference call and webcast hosted by Atlantic Power's management team will be held on Friday, November 1, 2019 at 8:30 AM ET. Management's prepared remarks and the accompanying presentation for the conference call will be posted on the Conference Calls page of the Company's website (www.atlanticpower.com) on the evening of October 31st. During the conference call, management will present brief prepared remarks with the majority of the time allocated to addressing questions from analysts and investors.

Atlantic Power Corporation (NYSE: AT) (TSX: ATP) ("Atlantic Power" or the "Company") announced today that it has executed a new ten-year Energy Purchase Agreement (EPA) with BC Hydro for the Williams Lake biomass plant in British Columbia, Canada. The new EPA is effective October 1, 2019. The plant had been operating under a short-term EPA since April 2, 2018, which expired on September 30, 2019.