XML 63 R68.htm IDEA: XBRL DOCUMENT v3.2.0.727

Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details)	Jun. 30, 2015 merchants Megawatts Customers	Apr. 14, 2015 Megawatts	Sep. 30, 2014 Customers
Derivative
Number of active future commission merchants | merchants	2
Megawatts of Power Purchase Agreement		700
Credit of Customers
Derivative
Number of customers that represent the concentration of accounts receivable percent outstanding | Customers	3		3
Percent of total outstanding accounts receivables	26.00%		27.00%
Megawatts of Power Purchase Agreement
Derivative
Megawatts of Power Purchase Agreement	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

Number of active future commission merchants to clear commodity contracts.

+ References

No definition available.

+ Details

Name:	tve_NumberOfActiveFutureCommissionMerchants
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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=tve_CreditOfCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=us-gaap_LongTermContractForPurchaseOfElectricPowerDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: