Capacity of plant

No definition available.

Name:	creg_CapacityOfPlant
Namespace Prefix:	creg_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Estimated Additional Construction Cost

+ References

No definition available.

+ Details

Name:	creg_EstimatedAdditionalConstructionCost
Namespace Prefix:	creg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Estimated Cost of Investment

+ References

No definition available.

+ Details

Name:	creg_EstimatedCostOfInvestment
Namespace Prefix:	creg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Expected Completion Date Of Facility

+ References

No definition available.

+ Details

Name:	creg_ExpectedCompletionDateOfFacility
Namespace Prefix:	creg_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Lease Agreement Monthly payment

+ References

No definition available.

+ Details

Name:	creg_LeaseAgreementMonthlyPayment
Namespace Prefix:	creg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number Of Phases Of Construction

+ References

No definition available.

+ Details

Name:	creg_NumberOfPhasesOfConstruction
Namespace Prefix:	creg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Production Plants

+ References

No definition available.

+ Details

Name:	creg_NumberOfProductionPlants
Namespace Prefix:	creg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Operating Lease Term Years

+ References

No definition available.

+ Details

Name:	creg_OperatingLeaseTermYears
Namespace Prefix:	creg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Increases in Monthly Rental Payment

+ References

No definition available.

+ Details

Name:	creg_PercentageIncreasesInMonthlyRentalPayment
Namespace Prefix:	creg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate costs related to construction and development services during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

Name:	us-gaap_ConstructionAndDevelopmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

Name:	us-gaap_ConstructionInProgressGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

+ References

+ Details

Name:	us-gaap_CostOfPropertyRepairsAndMaintenance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 122

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash payments to lessor's for use of assets under operating leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_PaymentsForRent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_SecurityDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Commitments - Additional Information (Detail)			1 Months Ended		3 Months Ended		6 Months Ended			1 Months Ended	3 Months Ended		6 Months Ended			1 Months Ended								1 Months Ended								6 Months Ended		1 Months Ended				6 Months Ended		1 Months Ended
Commitments - Additional Information (Detail)	Jun. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Mar. 05, 2010 Xi'an TCH	Jan. 20, 2010 Xi'an TCH MW	Jun. 30, 2012 Xi'an TCH USD ($)	Jun. 30, 2011 Xi'an TCH USD ($)	Jun. 30, 2012 Xi'an TCH USD ($)	Jun. 30, 2011 Xi'an TCH USD ($)	Jun. 30, 2012 Xi'an TCH CNY	Mar. 05, 2010 Xi'an TCH Monthly payment USD ($)	Jun. 30, 2012 ShangHai TCH USD ($)	Jun. 30, 2011 ShangHai TCH USD ($)	Jun. 30, 2012 ShangHai TCH USD ($)	Jun. 30, 2011 ShangHai TCH USD ($)	Jun. 30, 2012 ShangHai TCH Monthly payment USD ($)	Apr. 30, 2009 Erdos TCH signed with Metallurgy USD ($) Phase MW	Apr. 30, 2009 Erdos TCH signed with Metallurgy CNY Phase MW	Apr. 18, 2009 Erdos TCH signed with Metallurgy USD ($) Phase MW	Apr. 18, 2009 Erdos TCH signed with Metallurgy CNY	Apr. 30, 2009 Erdos TCH signed with Metallurgy Maximum MW	Apr. 18, 2009 Erdos TCH signed with Metallurgy Maximum MW	Apr. 30, 2009 Erdos TCH signed with Metallurgy Minimum USD ($)	Apr. 30, 2009 Erdos TCH signed with Metallurgy Minimum CNY	Mar. 31, 2010 Erdos TCH signed with Metallurgy Phase I	Apr. 30, 2009 Erdos TCH signed with Metallurgy Phase I MW Property	Apr. 18, 2009 Erdos TCH signed with Metallurgy Phase I MW Property	Apr. 30, 2009 Erdos TCH signed with Metallurgy Phase II MW Property	Apr. 18, 2009 Erdos TCH signed with Metallurgy Phase II MW Property	Apr. 30, 2009 Erdos TCH signed with Metallurgy steam per hour ton	Apr. 30, 2009 Erdos TCH signed with Metallurgy Phase III MW Property	Apr. 18, 2009 Erdos TCH signed with Metallurgy Phase III MW Property	Jun. 30, 2012 Erdos TCH signed with Metallurgy Phase III USD ($)	Dec. 31, 2011 Erdos TCH signed with Metallurgy Phase III USD ($)	Apr. 18, 2009 Maintenance And Operations Outsourcing USD ($)	Apr. 18, 2009 Maintenance And Operations Outsourcing CNY	Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co USD ($) MW	Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co CNY	Jun. 30, 2012 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co USD ($)	Dec. 31, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co USD ($)	Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co Project One MW Property	Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co Project Two MW Property	Feb. 28, 2011 Xi'an TCH signed with Shannxi Datong Coal Group Steel Ltd Co Project Three MW Property
Loss Contingencies [Line Items]
Operating lease term			2 years										1 year			20 years	20 years																			30 years	30 years
Operating lease expiry date			Mar. 04, 2012
Monthly rental payment										$ 16,360					$ 260
Rental expense					50,250	50,250	100,507	99,191			809	780	1,609	780
Percentage of increase in monthly rental payment							8.00%
Future minimum rental payments required under operating leases for 2013	215,000
Capacity of plant				12												70	70	70	70	120	120				18	18	27	27	30	25	25					23	23			3	15	1
Estimated total investment																79,000,000	500,000,000
Number of phases of construction of power generation system																3	3	3	3
Number of power generation system																									2	2	3	3		1	1									2	1	2
Minimum monthly payment for each 9MW power generation system																						220,000	1,500,000
Completion date of facility																								March of 2010		During the first quarter of 2010		Fourth quarter of 2010 and first quarter of 2011				End of 2012
Yearly cost of operation and maintenance of each power generation system																																		922,000.00	6,270,000
Construction in progress	32,542,628	32,466,242																														19,720,000	19,770,000					12,830,000	12,700,000
Estimated additional construction cost																																8,740,000						15,630,000
Quality deposit					334,388		334,388		2,125,000																							120,000
Construction costs																		$ 79,000,000	500,000,000																	$ 27,450,000	180,000,000