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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) $ 147 $ 121 $ 89
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 227 238 211
Deferred income taxes 56 67 82
Renewable adjustment clause deferrals 22 (12) (11)
Regulatory deferral of settled derivative instruments 12 26 (31)
Power cost deferrals, net of amortization 10 (1) (18)
Increase (decrease) in net liabilities from price risk management activities 9 118 (145)
Regulatory deferrals--price risk management activities (6) (118) 145
Senate Bill 408 amortization (7) (13) 0
Allowance for equity funds used during construction (5) (13) (18)
Decoupling mechanism deferrals, net of amortization 3 (10) 7
Unrealized gains on non-qualified benefit plan trust assets 0 (5) (8)
Other non-cash income and expenses, net 38 27 43
Changes in working capital:      
(Increase) decrease in receivables and unbilled revenues (15) 24 11
Decrease (increase) in margin deposits 3 (27) 133
Income tax refund received 9 53 0
Increase in income taxes receivable 0 (22) (53)
Increase (decrease) in payables and accrued liabilities 5 (11) (16)
Other working capital items, net (7) 0 2
Contribution to pension plan (26) (30) 0
Contribution to voluntary employees’ benefit association trust (16) (1) 0
Distribution of Trojan refund liability 0 0 (34)
Other, net (6) (20) (3)
Net cash provided by operating activities 453 391 386
Cash flows from investing activities:      
Capital expenditures (300) (450) (696)
Purchases of nuclear decommissioning trust securities 50 46 36
Sales of nuclear decommissioning trust securities 46 50 36
Distribution from nuclear decommissioning fund 0 19 0
Other, net 5 (3) (4)
Net cash used in investing activities (299) (430) (700)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 0 249 580
Payments on long-term debt (73) (186) (142)
Proceeds from Issuance of Common Stock, net of issuance cost 0 0 170
Issuances (maturities) of commercial paper, net 11 19 (65)
Borrowings on short-term debt 0 11 0
Payments on short-term debt 0 (11) (7)
Borrowings on revolving lines of credit 0 0 82
Payments on revolving lines of credit 0 0 (213)
Dividends paid (79) (78) (72)
Premium paid on repayment of long-term debt (7) 0 0
Debt issuance costs 0 (2) (5)
Noncontrolling interests’ capital (distributions) contributions (4) 10 7
Net cash (used in) provided by financing activities (152) 12 335
Change in cash and cash equivalents 2 (27) 21
Cash and cash equivalents, beginning of year 4 31 10
Cash and cash equivalents, end of year 6 4 31
Supplemental disclosures of cash flow information:      
Cash paid for interest, net of amounts capitalized 103 98 74
Cash paid for income taxes 3 0 2
Non-cash investing and financing activities:      
Accrued capital additions 19 12 17
Accrued dividends payable 21 20 20
Preliminary engineering transferred to Construction work in progress from Other noncurrent assets $ 7 $ 0 $ 0