October 14, 2009

Kitchener, ON, Canada: Canadian Solar Announces Follow-on Public Offering

Canadian Solar intends to offer, subject to market and other conditions, approximately 6 million shares of common stock. In connection with this offering, the underwriters will have an option to purchase up to an additional 900,000 shares of common stock. The company is conducting the offering pursuant to an effective registration statement under the Securities Act of 1933.

The company plans to use the net proceeds for general corporate purposes. Pending application of the funds, the Company expects to invest the net proceeds in short-term interest-bearing securities or bank deposits.

The offering is being made solely by means of a prospectus supplement and accompanying prospectus. This press release does not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale is unlawful.

Morgan Stanley, Deutsche Bank Securities Inc. and Piper Jaffray & Co. are serving as joint bookrunners of this offering, and Wells Fargo Securities is serving as co-manager. Copies of the preliminary prospectus supplement and final prospectus supplement, when available, may be obtained from Morgan Stanley & Co. Incorporated, 1585 Broadway, New York, NY 10036.

Based on its selected unaudited financial results, Canadian Solar believes that its net revenues for the third quarter of 2009 will be approximately $210 million to $215 million, with shipments of approximately 101 MW to 103 MW, compared to prior guidance for shipments of approximately 90 MW to 100 MW. We expect to report a gross margin of 16% to 17% for the third quarter of 2009.

Based on the high level of interest in Canadian Solar's products at the Hamburg trade show and subsequent purchase orders, the Company is raising its guidance for full year 2009 shipments to approximately 295 MW to 305 MW, including expected shipments of 127 MW to 137 MW for the fourth quarter of 2009. This compares to prior guidance for shipments of approximately 260 MW to 270 MW for the full year 2009, and earlier full year 2009 guidance of 200 MW to 220 MW. The Company continues to make improvements in its cost structure, which it expects will positively impact ongoing profitability.

Dr. Shawn Qu, Chairman and CEO said: "Demand has continued to be strong among our core customer group as well as among new customers. We anticipate that Q4 2009 will be even stronger than Q3 2009 in terms of shipments and we expect to maintain similar gross margins. We plan to increase our solar module manufacturing capacity to 1 GW, our solar cell capacity to 700 MW and our ingot and wafer capacity to 350 MW by the end of 2010 to meet demand levels."

Further details about: Canadian Solar Inc.