[Canadian Solar Announces Expiration of Put Option Exercise Period for Its GUELPH, Ontario, Canada, Dec. 18, 2012 — Canadian Solar Inc. (the “Company”, or “Canadian Solar”) (NASDAQ: CSIQ), one of the world’s largest solar power companies, About Canadian Solar Canadian Solar Inc. is one of the world’s largest solar companies. As a leading vertically integrated provider of ingots, wafers, solar] [FORM 6-K CANADIAN SOLAR INC. No. 199 Lushan Road Suzhou New District Suzhou, Jiangsu 215129 People’s Republic of China Form 20-F x Form 40-F o o o CANADIAN SOLAR INC. Form 6-K TABLE OF CONTENTS]

[Canadian Solar Appoints Guangchun Zhang as Chief Operating Officer GUELPH, Ontario, Canada, Dec. 13, 2012 — Canadian Solar Inc. (the “Company”, or “Canadian Solar”) (NASDAQ: CSIQ), one of the world’s largest solar power companies, today announced the appointment of Mr. Guangchun Zhang as Chief Operating Officer. Reporting directly to Canadian Solar Chairman and Chief Executive Officer, Dr. Shawn Qu, Mr.] [FORM 6-K CANADIAN SOLAR INC. No. 199 Lushan Road Suzhou New District Suzhou, Jiangsu 215129 People’s Republic of China Form 20-F x Form 40-F o o o CANADIAN SOLAR INC. Form 6-K TABLE OF]

[Canadian Solar Receives C$139 Million Non-Recourse Construction Financing Agreement The loan facility is intended to support the simultaneous construction of five utility-scale solar power plants totaling 49 MW AC. Developed by Canadian Solar, the projects are expected to be built and connected through 2012 and 2013. All of the projects have been awarded a 20-year power purchase contract (the “FIT] [FORM 6-K CANADIAN SOLAR INC. No. 199 Lushan Road Suzhou New District Suzhou, Jiangsu 215129 People’s Republic of China Form 20-F x Form 40-F o o o CANADIAN SOLAR INC. Form 6-K TABLE]