[Canadian Solar Comments on European Commission Letter Raising Potential Issues Concerning Compliance with the Undertaking Agreement GUELPH, Ontario, March 10, 2015 — Canadian Solar Inc. (the “Company”, or “Canadian Solar”) (NASDAQ: CSIQ), one of the world’s largest solar power companies, today stated that the European Commission has informed the Company of potential issues identified in the course of verifying Canadian] [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 3 4]