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BASIS OF PRESENTATION (Details)	3 Months Ended
	Mar. 31, 2013
BASIS OF PRESENTATION
Minimum period of prior notice to cancel supplemental agreement	30 days

X

- Definition

Represents the minimum period of notice which is required to exercise the right to cancel the supplemental agreement setting forth the terms of project.

+ References

No definition available.

+ Details

Name:	tge_MinimumPeriodOfWrittenNoticeToCancelSupplementalAgreement
Namespace Prefix:	tge_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	tge_NatureOfOperationsDisclosureAbstract
Namespace Prefix:	tge_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration