CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents		$ 648	$ 352
Restricted cash and cash equivalents		67	176
Accounts receivable (less reserve:)
Customer		261	186
Other		36	103
Accounts receivable from affiliates		0	36
Unbilled revenues		125	218
Fuel, materials and supplies		468	455
Prepayments		52	70
Deferred income taxes		114	8
Price risk management assets		576	1,079
Assets of discontinued operations		266	0
Other current assets		9	18
Total Current Assets		2,622	2,701
Investments
Nuclear plant decommissioning trust funds		913	950
Other investments		25	30
Total Investments		938	980
Property, Plant and Equipment
Generation		13,167	11,318
Nuclear fuel		652	624
Other		320	293
Less: accumulated depreciation		6,479	6,242
Property, plant and equipment, net		7,660	5,993
Construction work in progress		411	443
Total Property, Plant and Equipment, net		8,071	6,436
Other Noncurrent Assets
Goodwill		0	72
Other intangibles		309	257
Price risk management assets		226	239
Other noncurrent assets		88	75
Total Other Noncurrent Assets		623	643
Total Assets		12,254	10,760
Current Liabilities
Short-term debt		0	630
Long-term debt due within one year		654	535
Accounts payable		278	361
Accounts payable to affiliates		0	50
Taxes		13	28
Interest		68	16
Price risk management liabilities		506	1,024
Liabilities of discontinued operations		5	0
Counterparty collateral		92	16
Other current liabilities		232	230
Total Current Liabilities		1,848	2,890
Long-term Debt		3,376	1,683
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,559	1,223
Investment tax credits		26	27
Price risk management liabilities		178	193
Accrued pension obligations		253	299
Asset retirement obligations		472	415
Other deferred credits and noncurrent liabilities		140	123
Total Deferred Credits and Other Noncurrent Liabilities		$ 2,628	$ 2,280
Commitments and Contingent Liabilities
Equity
Predecessor Member's Equity	[1]	$ 0	$ 3,930
Common Stock - $0.001 par value	[2]	0	0
Earnings reinvested		4,719	0
Accumulated other comprehensive income (loss)		(311)	0
Total Equity		(6)	(23)
Total Equity		4,402	3,907
Total Liabilities and Equity		12,254	10,760
Talen Energy Supply
Current Assets
Cash and cash equivalents		648	352
Restricted cash and cash equivalents		67	176
Accounts receivable (less reserve:)
Customer		261	186
Other		36	103
Accounts receivable from affiliates		0	36
Unbilled revenues		125	218
Fuel, materials and supplies		468	455
Prepayments		52	70
Deferred income taxes		114	8
Price risk management assets		576	1,079
Assets of discontinued operations		266	0
Other current assets		9	18
Total Current Assets		2,622	2,701
Investments
Nuclear plant decommissioning trust funds		913	950
Other investments		25	30
Total Investments		938	980
Property, Plant and Equipment
Generation		13,167	11,318
Nuclear fuel		652	624
Other		320	293
Less: accumulated depreciation		6,479	6,242
Property, plant and equipment, net		7,660	5,993
Construction work in progress		411	443
Total Property, Plant and Equipment, net		8,071	6,436
Other Noncurrent Assets
Goodwill		0	72
Other intangibles		309	257
Price risk management assets		226	239
Other noncurrent assets		88	75
Total Other Noncurrent Assets		623	643
Total Assets		12,254	10,760
Current Liabilities
Short-term debt		0	630
Long-term debt due within one year		654	535
Accounts payable		278	361
Accounts payable to affiliates		0	50
Taxes		13	28
Interest		68	16
Price risk management liabilities		506	1,024
Liabilities of discontinued operations		5	0
Counterparty collateral		92	16
Other current liabilities		232	230
Total Current Liabilities		1,848	2,890
Long-term Debt		3,376	1,683
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,559	1,223
Investment tax credits		26	27
Price risk management liabilities		178	193
Accrued pension obligations		253	299
Asset retirement obligations		472	415
Other deferred credits and noncurrent liabilities		140	123
Total Deferred Credits and Other Noncurrent Liabilities		$ 2,628	$ 2,280
Commitments and Contingent Liabilities
Equity
Member's Equity		$ 4,402	$ 3,907
Total Liabilities and Equity		$ 12,254	$ 10,760

[1] Represents Talen Energy Supply's predecessor member's equity prior to the June 1, 2015 spinoff transaction. Upon completion of the spinoff, the predecessor member's equity was transferred to Talen Energy Corporation's additional paid-in capital. See Note 1 for additional information on the spinoff.

[2] 1,000,000 shares authorized; 128,509 shares issued and outstanding at September 30, 2015.