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Condensed Consolidating Financial Information (Details 4) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Cash Flows from Operating Activities    
Net Income$ (55)$ 223$ 306$ 491
Adjustments to reconcile net income/(loss) to net cash (used)/provided by operating activities:    
Distributions and equity in (earnings)/losses of unconsolidated affiliates  8(19)
Depreciation and amortization238210665620
Provision for bad debts  4146
Amortization of nuclear fuel  3130
Amortization of financing costs and debt discount/premiums  2523
Gain (Loss) on debt extinguishment  580
Amortization of intangibles and out-of-market contracts  118(17)
Changes in deferred income taxes and liability for uncertain tax benefits  (829)272
Changes in nuclear decommissioning trust liability  2026
Changes in derivatives  (201)(48)
Changes in collateral deposits supporting energy risk management activities  7(116)
Impairment charge on investment  4810
Impairment of Long-Lived Assets Held-for-use16001600
Cash used/(provided) by changes in other working capital  (222)(167)
Net Cash Provided/(Used) by Operating Activities  6681,141
Cash Flows from Investing Activities    
Intercompany loans to subsidiaries  00
Acquisition of businesses, net of cash acquired  (352)(142)
Investment in subsidiaries   0
Capital expenditures  (1,355)(490)
Increase in restricted cash, net  (92)(17)
Increase/(Decrease) in restricted cash to support equity requirements for DOE funded projects  (316)0
Decrease in notes receivable  2728
Purchases of emission allowances  (27)(56)
Proceeds from sale of emission allowances  614
Investments in nuclear decommissioning trust fund securities  (314)(245)
Proceeds from sales of nuclear decommissioning trust fund securities  294219
Proceeds from renewable energy grants  0102
Proceeds from sale of assets  1430
Investments in unconsolidated affiliates  (17)0
Other  (29)(13)
Net Cash (Used)/Provided by Investing Activities  (2,161)(570)
Cash Flows from Financing Activities    
Proceeds from intercompany loans  00
Payment of intercompany dividends  00
Payment of dividends to preferred stockholders  (7)(7)
Payment for treasury stock  (378)(180)
Installment proceeds from sale of noncontrolling interest in subsidiary  050
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements  (61)58
Proceeds from issuance of long-term debt  5,7101,252
Proceeds from issuance of term loan for funded letter of credit facility  01,300
Increase in restricted cash supporting funded letter of credit  1,300(1,301)
Settlement of Funded Leter of Credit  (1,300)0
Proceeds from issuance of common stock  22
Payment of debt issuance costs  (149)(70)
Payments for short and long-term debt  (5,450)(529)
Net Cash Provided/(Used) by Financing Activities  (333)575
Effect of exchange rate changes on cash and cash equivalents  2(3)
Net (Decrease)/Increase in Cash and Cash Equivalents  (1,824)1,143
Cash and Cash Equivalents at Beginning of Period  2,9512,304
Cash and Cash Equivalents at End of Period1,1273,4471,1273,447
Guarantor Subsidiaries
    
Cash Flows from Operating Activities    
Net Income  185873
Adjustments to reconcile net income/(loss) to net cash (used)/provided by operating activities:    
Distributions and equity in (earnings)/losses of unconsolidated affiliates  (10)12
Depreciation and amortization224198626590
Provision for bad debts  4146
Amortization of nuclear fuel  3130
Amortization of financing costs and debt discount/premiums   0
Gain (Loss) on debt extinguishment  0 
Amortization of intangibles and out-of-market contracts  118(17)
Changes in deferred income taxes and liability for uncertain tax benefits  123480
Changes in nuclear decommissioning trust liability  2026
Changes in derivatives  (199)(48)
Changes in collateral deposits supporting energy risk management activities  5(116)
Impairment charge on investment  481 
Impairment of Long-Lived Assets Held-for-use160 160 
Cash used/(provided) by changes in other working capital  (1,182)(551)
Net Cash Provided/(Used) by Operating Activities  3991,325
Cash Flows from Investing Activities    
Intercompany loans to subsidiaries  (191)(1,261)
Acquisition of businesses, net of cash acquired  00
Investment in subsidiaries   0
Capital expenditures  (295)(223)
Increase in restricted cash, net  (54)1
Increase/(Decrease) in restricted cash to support equity requirements for DOE funded projects  0 
Decrease in notes receivable  00
Purchases of emission allowances  (27)(56)
Proceeds from sale of emission allowances  614
Investments in nuclear decommissioning trust fund securities  (314)(245)
Proceeds from sales of nuclear decommissioning trust fund securities  294219
Proceeds from renewable energy grants   84
Proceeds from sale of assets  141
Investments in unconsolidated affiliates  (1) 
Other  (11)0
Net Cash (Used)/Provided by Investing Activities  (579)(1,466)
Cash Flows from Financing Activities    
Proceeds from intercompany loans  38126
Payment of intercompany dividends  (65)(44)
Payment of dividends to preferred stockholders  00
Payment for treasury stock  00
Installment proceeds from sale of noncontrolling interest in subsidiary   0
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements  (61)58
Proceeds from issuance of long-term debt  1167
Proceeds from issuance of term loan for funded letter of credit facility   0
Increase in restricted cash supporting funded letter of credit  00
Settlement of Funded Leter of Credit  0 
Proceeds from issuance of common stock  00
Payment of debt issuance costs  0(1)
Payments for short and long-term debt  00
Net Cash Provided/(Used) by Financing Activities  28146
Effect of exchange rate changes on cash and cash equivalents  00
Net (Decrease)/Increase in Cash and Cash Equivalents  (152)5
Cash and Cash Equivalents at Beginning of Period  16820
Cash and Cash Equivalents at End of Period16251625
Non-Guarantor Subsidiaries
    
Cash Flows from Operating Activities    
Net Income  2347
Adjustments to reconcile net income/(loss) to net cash (used)/provided by operating activities:    
Distributions and equity in (earnings)/losses of unconsolidated affiliates  2(17)
Depreciation and amortization1092823
Provision for bad debts   0
Amortization of nuclear fuel   0
Amortization of financing costs and debt discount/premiums  55
Gain (Loss) on debt extinguishment  0 
Amortization of intangibles and out-of-market contracts  00
Changes in deferred income taxes and liability for uncertain tax benefits  63
Changes in nuclear decommissioning trust liability  00
Changes in derivatives  10
Changes in collateral deposits supporting energy risk management activities  20
Impairment charge on investment  0 
Impairment of Long-Lived Assets Held-for-use0 0 
Cash used/(provided) by changes in other working capital  211(82)
Net Cash Provided/(Used) by Operating Activities  278(21)
Cash Flows from Investing Activities    
Intercompany loans to subsidiaries  00
Acquisition of businesses, net of cash acquired  (91)(142)
Investment in subsidiaries   1,724
Capital expenditures  (1,027)(224)
Increase in restricted cash, net  (38)(18)
Increase/(Decrease) in restricted cash to support equity requirements for DOE funded projects  (254) 
Decrease in notes receivable  2728
Purchases of emission allowances  00
Proceeds from sale of emission allowances  00
Investments in nuclear decommissioning trust fund securities  00
Proceeds from sales of nuclear decommissioning trust fund securities  00
Proceeds from renewable energy grants   18
Proceeds from sale of assets  00
Investments in unconsolidated affiliates  (16) 
Other  (8)(16)
Net Cash (Used)/Provided by Investing Activities  (1,407)1,370
Cash Flows from Financing Activities    
Proceeds from intercompany loans  44886
Payment of intercompany dividends  (1,304)(37)
Payment of dividends to preferred stockholders  00
Payment for treasury stock  00
Installment proceeds from sale of noncontrolling interest in subsidiary   50
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements  00
Proceeds from issuance of long-term debt  798145
Proceeds from issuance of term loan for funded letter of credit facility   0
Increase in restricted cash supporting funded letter of credit  1,300(1,301)
Settlement of Funded Leter of Credit    
Proceeds from issuance of common stock  00
Payment of debt issuance costs  (41)(8)
Payments for short and long-term debt  (77)(282)
Net Cash Provided/(Used) by Financing Activities  1,124(1,347)
Effect of exchange rate changes on cash and cash equivalents  2(3)
Net (Decrease)/Increase in Cash and Cash Equivalents  (3)(1)
Cash and Cash Equivalents at Beginning of Period  111120
Cash and Cash Equivalents at End of Period108119108119
NRG Energy, Inc.
    
Cash Flows from Operating Activities    
Net Income  306492
Adjustments to reconcile net income/(loss) to net cash (used)/provided by operating activities:    
Distributions and equity in (earnings)/losses of unconsolidated affiliates  1,184(854)
Depreciation and amortization43117
Provision for bad debts   0
Amortization of nuclear fuel   0
Amortization of financing costs and debt discount/premiums  2018
Gain (Loss) on debt extinguishment  58 
Amortization of intangibles and out-of-market contracts  00
Changes in deferred income taxes and liability for uncertain tax benefits  (958)(211)
Changes in nuclear decommissioning trust liability  00
Changes in derivatives  (3)0
Changes in collateral deposits supporting energy risk management activities  00
Impairment charge on investment  0 
Impairment of Long-Lived Assets Held-for-use0 0 
Cash used/(provided) by changes in other working capital  742466
Net Cash Provided/(Used) by Operating Activities  1,360(82)
Cash Flows from Investing Activities    
Intercompany loans to subsidiaries  (486)(212)
Acquisition of businesses, net of cash acquired  (261)0
Investment in subsidiaries   (1,724)
Capital expenditures  (33)(43)
Increase in restricted cash, net  00
Increase/(Decrease) in restricted cash to support equity requirements for DOE funded projects  (62) 
Decrease in notes receivable  00
Purchases of emission allowances  00
Proceeds from sale of emission allowances  00
Investments in nuclear decommissioning trust fund securities  00
Proceeds from sales of nuclear decommissioning trust fund securities  00
Proceeds from renewable energy grants   0
Proceeds from sale of assets  029
Investments in unconsolidated affiliates  0 
Other  (10)3
Net Cash (Used)/Provided by Investing Activities  (852)(1,947)
Cash Flows from Financing Activities    
Proceeds from intercompany loans  1911,261
Payment of intercompany dividends  00
Payment of dividends to preferred stockholders  (7)(7)
Payment for treasury stock  (378)(180)
Installment proceeds from sale of noncontrolling interest in subsidiary   0
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements  00
Proceeds from issuance of long-term debt  4,7961,100
Proceeds from issuance of term loan for funded letter of credit facility   1,300
Increase in restricted cash supporting funded letter of credit  00
Settlement of Funded Leter of Credit  (1,300) 
Proceeds from issuance of common stock  22
Payment of debt issuance costs  (108)(61)
Payments for short and long-term debt  (5,373)(247)
Net Cash Provided/(Used) by Financing Activities  (2,177)3,168
Effect of exchange rate changes on cash and cash equivalents  00
Net (Decrease)/Increase in Cash and Cash Equivalents  (1,669)1,139
Cash and Cash Equivalents at Beginning of Period  2,6722,164
Cash and Cash Equivalents at End of Period1,0033,3031,0033,303
Eliminations
    
Cash Flows from Operating Activities    
Net Income  (208)[1](921)[1]
Adjustments to reconcile net income/(loss) to net cash (used)/provided by operating activities:    
Distributions and equity in (earnings)/losses of unconsolidated affiliates  (1,168)[1]840[1]
Depreciation and amortization0[1]0[1]0[1]0[1]
Provision for bad debts   [1]0[1]
Amortization of nuclear fuel   [1]0[1]
Amortization of financing costs and debt discount/premiums   [1]0[1]
Gain (Loss) on debt extinguishment  0[1] 
Amortization of intangibles and out-of-market contracts  0[1]0[1]
Changes in deferred income taxes and liability for uncertain tax benefits  0[1]0[1]
Changes in nuclear decommissioning trust liability  0[1]0[1]
Changes in derivatives  0[1]0[1]
Changes in collateral deposits supporting energy risk management activities  0[1]0[1]
Impairment charge on investment  0[1] 
Impairment of Long-Lived Assets Held-for-use0[1] 0[1] 
Cash used/(provided) by changes in other working capital  7[1]0[1]
Net Cash Provided/(Used) by Operating Activities  (1,369)[1](81)[1]
Cash Flows from Investing Activities    
Intercompany loans to subsidiaries  677[1]1,473[1]
Acquisition of businesses, net of cash acquired  0[1]0[1]
Investment in subsidiaries   0[1]
Capital expenditures  0[1]0[1]
Increase in restricted cash, net  0[1]0[1]
Increase/(Decrease) in restricted cash to support equity requirements for DOE funded projects  0[1] 
Decrease in notes receivable  0[1]0[1]
Purchases of emission allowances  0[1]0[1]
Proceeds from sale of emission allowances  0[1]0[1]
Investments in nuclear decommissioning trust fund securities  0[1]0[1]
Proceeds from sales of nuclear decommissioning trust fund securities  0[1]0[1]
Proceeds from renewable energy grants   0[1]
Proceeds from sale of assets  0[1]0[1]
Investments in unconsolidated affiliates  0[1] 
Other  0[1]0[1]
Net Cash (Used)/Provided by Investing Activities  677[1]1,473[1]
Cash Flows from Financing Activities    
Proceeds from intercompany loans  (677)[1](1,473)[1]
Payment of intercompany dividends  1,369[1]81[1]
Payment of dividends to preferred stockholders  0[1]0[1]
Payment for treasury stock  0[1]0[1]
Installment proceeds from sale of noncontrolling interest in subsidiary   0[1]
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements  0[1]0[1]
Proceeds from issuance of long-term debt  0[1]0[1]
Proceeds from issuance of term loan for funded letter of credit facility   0[1]
Increase in restricted cash supporting funded letter of credit  0[1]0[1]
Settlement of Funded Leter of Credit  0[1] 
Proceeds from issuance of common stock  0[1]0[1]
Payment of debt issuance costs  0[1]0[1]
Payments for short and long-term debt  0[1]0[1]
Net Cash Provided/(Used) by Financing Activities  692[1](1,392)[1]
Effect of exchange rate changes on cash and cash equivalents  0[1]0[1]
Net (Decrease)/Increase in Cash and Cash Equivalents  0[1]0[1]
Cash and Cash Equivalents at Beginning of Period  0[1]0[1]
Cash and Cash Equivalents at End of Period$ 0[1]$ 0[1]$ 0[1]$ 0[1]
[1]All significant intercompany transactions have been eliminated in consolidation.