Canadian Solar Financial and Operational Summary Q1 2022

Disciplined management of opex, working capital and capex Operating Expenses as % of Revenue Working Capital Days (1) Total operating expenses Days 2020 2021 2Q21 3Q21 4Q21 1Q22 11.0% 14.4% 13.5% 13.6% 13.5% Inventory turnover 63 89 76 107 89 120 7.8% 6.5% 6.4% Accounts 5.6% 41 46 39 59 46 55 4.4% receivable turnover Selling & distribution expenses Accounts payable turnover 117 123 108 144 110 148 Cash conversion cycle -13 12 7 22 25 27 7.6% 6.6% 6.5% 5.9% General & 5.6% administrative expenses Capital Expenditures (2) 11.7% 8.2% 8.4% 9.1% 9.6% 8.1% c.850 1.5% 430 1.2% 1.3% 1.1% 320 Research & development 1.1% 280 290 330 expenses 2018 2019 2020 2021 1Q22 TTM 2017 2018 2019 2020 Capex, $mn 2021 Capex as % of revenue 1) Inventory turnover days calculated as average gross inventory (adding back provisions) divided by cost of revenues x365 Account receivables days calculated as average gross accounts receivable (adding back bad debt allowance) divided by total revenues x365. Accounts payable days calculated as average accounts payable divided by cost of revenues x365. 2) Capex for PP&E only (does not include capex related to project development). 2022E CanadianSolar MAKE THE DIFFERENCE 38

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