[EXECUTION 2,778,000 Shares CANADIAN SOLAR INC. Common Shares UNDERWRITING AGREEMENT February 11, 2014 CREDIT SUISSE SECURITIES (USA) LLC J.P. MORGAN SECURITIES LLC As Representatives of the Several Underwriters Ladies and Gentlemen: 1. Introductory Company Underwriters Firm Securities Securities Optional Securities Offered Securities Concurrent Offering . Canadian Solar Inc., a Canada Business Corporations Act corporation (“ 2. (a) Filing and Effectiveness] [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 Incorporation by Reference 2 CANADIAN SOLAR INC. Form 6-K TABLE OF CONTENTS]

[Canadian Solar Announces Pricing of Concurrent Offerings of 2,778,000 Common Shares and GUELPH, Ontario, February 12, 2014 - Canadian Solar Inc. (NASDAQ: CSIQ) (the “Company”, or “Canadian Solar”), one of the world’s largest solar power companies, today announced that it priced the offering of 2,778,000 common shares of the Company, with no par value (the “Common Shares”) (the “Common Shares] [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 CONTEN]

[Canadian Solar Announces the Concurrent Offerings of 2,600,000 Common Shares and US$100 Million GUELPH, Ontario, February 11, 2014 Credit Suisse Securities (USA) LLC, J.P. Morgan Securities LLC and Nomura Securities International, Inc. will act as joint book-running managers for the Common Shares Offering. The closing of the Notes Offering is contingent upon the closing of the Common Shares Offering, and] [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 Announces the Sale its Fourth Utility Scale Solar Power Plant in Ontario to a Fund Managed by BlackRock GUELPH, Ontario and TORONTO, February 6, 2014 — Canadian Solar Inc. (NASDAQ: CSIQ) ( the “Company”, or “Canadian Solar”), one of the world’s largest solar power companies, today announced that its subsidiary, Canadian Solar Solutions Inc., entered into an agreement] [Canadian Solar Announces the Sale of a 10MW Utility Scale Solar Power Plant in Ontario to a Fund Managed by BlackRock TORONTO and GUELPH, Ontario, January 27, 2014 - Canadian Solar Inc. (NASDAQ: CSIQ) (the “Company”, or “Canadian Solar”), one of the world’s largest solar power companies, today announced that its subsidiary, Canadian Solar Solutions Inc., entered into an agreement] [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]