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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details)	Dec. 31, 2013	Sep. 30, 2013 Customers
Credit of Customers [Member]
Derivative
Number of customers that represent the percent of outstanding accounts receivable	3	3
Percent of total outstanding accounts receivables	23.00%	26.00%
Power Purchase Agreement
Derivative
Megawatts	440

X

- Definition

Megawatts of summer net capability

+ References

No definition available.

+ Details

Name:	tve_Megawatts
Namespace Prefix:	tve_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of customers that represent the percent of outstanding accounts receivable.

+ References

No definition available.

+ Details

Name:	tve_NumberOfCustomersThatRepresentPercentOfOutstandingAccountsReceivable
Namespace Prefix:	tve_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percent of total outstanding accounts receivables represented by a certain number of customers.

+ References

No definition available.

+ Details

Name:	tve_PercentOfTotalOutstandingAccountsReceivables
Namespace Prefix:	tve_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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