The number of interests in solar power plants sold during the year.

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Amounts due from parties associated with the reporting entity as cash funded, due within 1 year (or 1 business cycle).

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Represents the percentage of units purchased.

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Amount of revenue from providing services earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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RELATED PARTY BALANCES AND TRANSACTIONS (Details) ¥ in Thousands, ¥ in Thousands, R$ in Thousands, R in Thousands, $ in Thousands	6 Months Ended		11 Months Ended		12 Months Ended											24 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 CNY (¥)	Nov. 30, 2020 USD ($)	Nov. 30, 2020 CNY (¥)	Dec. 31, 2020 USD ($) item shares	Dec. 31, 2020 CNY (¥) item shares	Dec. 31, 2020 JPY (¥) item shares	Dec. 31, 2020 BRL (R$) item shares	Dec. 31, 2019 USD ($) item shares	Dec. 31, 2019 CNY (¥) item shares	Dec. 31, 2019 JPY (¥) item shares	Dec. 31, 2019 ZAR (R) item shares	Dec. 31, 2018 USD ($) item shares	Dec. 31, 2018 CNY (¥) item shares	Dec. 31, 2018 JPY (¥) item shares	Dec. 31, 2019 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
RELATED PARTY BALANCES AND TRANSACTIONS
Amount due from related party					$ 5,834				$ 31,232							$ 31,232
Amounts due to related parties					314				10,077							$ 10,077
Amounts drawn down					177,214
Revenue from sale of solar products					$ 62,726				$ 99,470				$ 119,825
RSUs
RELATED PARTY BALANCES AND TRANSACTIONS
Granted (in shares) \| shares					1,105,640	1,105,640	1,105,640	1,105,640	706,637	706,637	706,637	706,637	759,702	759,702	759,702
Pilipinas Newton Energy Corp
RELATED PARTY BALANCES AND TRANSACTIONS
Cash funding from affiliate					$ 16
Equity Method Investment, Ownership Percentage					40.00%												40.00%
Salgueiro I Renewable Energy S.A
RELATED PARTY BALANCES AND TRANSACTIONS
Trade receivable from affiliate					$ 3,364
Equity Method Investment, Ownership Percentage					20.00%												20.00%
Revenue from sale of solar products					$ 11,636
Percentage of ownership after sale transaction					20.00%	20.00%	20.00%	20.00%
Salgueiro II Renewable Energy S.A.
RELATED PARTY BALANCES AND TRANSACTIONS
Trade receivable from affiliate					$ 195
Equity Method Investment, Ownership Percentage					20.00%												20.00%
Revenue from sale of solar products					$ 9,996
Percentage of ownership after sale transaction					20.00%	20.00%	20.00%	20.00%
Jaba 4 Energias Renovveis S.A.
RELATED PARTY BALANCES AND TRANSACTIONS
Trade receivable from affiliate					$ 2,123
Equity Method Investment, Ownership Percentage					20.00%												20.00%
Revenue from sale of solar products					$ 3,696
Percentage of ownership after sale transaction					20.00%	20.00%	20.00%	20.00%
Salgueiro III Renewable Energy S.A.
RELATED PARTY BALANCES AND TRANSACTIONS
Equity Method Investment, Ownership Percentage					20.00%												20.00%
Trade payable to affiliate					$ 104
Revenue from sale of solar products					$ 9,403
Percentage of ownership after sale transaction					20.00%	20.00%	20.00%	20.00%
Jaiba 3 Renewable Energy S.A.
RELATED PARTY BALANCES AND TRANSACTIONS
Revenue from sale of solar products					$ 5,971
Percentage of ownership after sale transaction					20.00%	20.00%	20.00%	20.00%
Jaiba 9 Renewable Energy S.A.
RELATED PARTY BALANCES AND TRANSACTIONS
Revenue from sale of solar products					$ 1,372
Percentage of ownership after sale transaction					20.00%	20.00%	20.00%	20.00%
ET Solutions South Africa 1 Pty
RELATED PARTY BALANCES AND TRANSACTIONS
Revenue from sale of solar products									$ 40,970			R 586,832	$ 6,859	¥ 45,407
Percentage of ownership after sale transaction																49.00%
Canadian Solar Infrastructure Fund, Inc
RELATED PARTY BALANCES AND TRANSACTIONS
Number of solar power plants sold \| item					2	2	2	2	3	3	3	3	5	5	5
Percent of units purchased					14.66%	14.66%	14.66%	14.66%	14.66%	14.66%	14.66%	14.66%	14.66%	14.66%	14.66%
Canadian Solar Infrastructure Fund, Inc \| Asset management service
RELATED PARTY BALANCES AND TRANSACTIONS
Trade payable to affiliate					$ 136
Revenue from providing development services					3,723		¥ 394,506		$ 2,573		¥ 281,094		$ 2,210		¥ 247,341
Canadian Solar Infrastructure Fund, Inc \| O & M Service
RELATED PARTY BALANCES AND TRANSACTIONS
Revenue from providing development services					7,564		805,021		2,052		223,598		1,105		122,529
Canadian Solar Infrastructure Fund, Inc \| Revenue
RELATED PARTY BALANCES AND TRANSACTIONS
Revenue from sale of solar products					$ 8,392		¥ 888,000		$ 53,874		¥ 5,889,000		109,597		12,276,404
Canadian Solar Infrastructure Fund, Inc \| Other operating income or expense
RELATED PARTY BALANCES AND TRANSACTIONS
Revenue from sale of solar products													$ 836		¥ 89,238
Suzhou iSilver Materials Co
RELATED PARTY BALANCES AND TRANSACTIONS
Percent of units purchased									14.63%	14.63%	14.63%	14.63%	14.63%	14.63%	14.63%
Purchase from related party			$ 24,301	¥ 168,032					$ 50,359	¥ 350,590			$ 74,490	¥ 512,154
Suzhou Kzone Equipment Technology Co., Ltd
RELATED PARTY BALANCES AND TRANSACTIONS
Percent of units purchased									32.00%	32.00%	32.00%	32.00%	32.00%	32.00%	32.00%
Purchase from related party	$ 1,048	¥ 7,381							$ 8,787	¥ 61,174			$ 6,056	¥ 41,635
Dr. Shawn Qu \| RSUs
RELATED PARTY BALANCES AND TRANSACTIONS
Granted (in shares) \| shares					26,073	26,073	26,073	26,073	26,691	26,691	26,691	26,691	83,805	83,805	83,805
Dr. Shawn Qu \| Chinese Commercial Banks
RELATED PARTY BALANCES AND TRANSACTIONS
Maximum borrowing capacity					$ 20,648				$ 203,549				$ 185,045			$ 203,549	¥ 135,000	¥ 1,420,000	¥ 1,270,000
Amounts drawn down					$ 0				$ 82,937				$ 155,956			$ 82,937
Luoyang Jiwa New Material Technology Co., Ltd [Member]
RELATED PARTY BALANCES AND TRANSACTIONS
Equity Method Investment, Ownership Percentage					20.00%												20.00%
Trade payable to affiliate					$ 210
Percent of units purchased					20.00%	20.00%	20.00%	20.00%	20.00%	20.00%	20.00%	20.00%
Purchase from related party					$ 4,545	¥ 31,388			$ 2,584	¥ 18,124
Lavras Solar Holding S.A
RELATED PARTY BALANCES AND TRANSACTIONS
Equity Method Investment, Ownership Percentage					20.00%												20.00%
Purchase from related party					$ 974
Purchase cost incurred from related party \| R$								R$ 5,061