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Refundable Deposits from Customers for Systems Leasing (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Refundable Deposit From Customers For Systems Leasing [Abstract] |  |
Balance of refundable deposits from customers | $ 0 | $ 544,709

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- References No definition available. + Details
Name: | creg_RefundableDepositFromCustomersForSystemsLeasingAbstract
Namespace Prefix: | creg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15a) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_CustomerAdvancesAndDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant