AXIUMAXIUM

LE 8 SEPTEMBRE 2021 – RECURRENT ENERGY COMPLETES MAJORITY SALE OF 1.4 GWH ENERGY STORAGE RELIABILITY PROJECT IN CALIFORNIA

GUELPH, Ontario – Canadian Solar Inc. (“Canadian Solar” or “the Company”)
(NASDAQ: CSIQ) today announced that its wholly-owned subsidiary, Recurrent Energy, LLC
(“Recurrent Energy”), sold an 80% stake in its 350 MW / 1400 MWh Crimson storage project to
Axium Infrastructure (“Axium”). Recurrent Energy will retain the remaining 20% ownership.
Construction of the storage project will begin in Q3 2021 and is expected to reach commercial
operation by the summer of 2022.