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STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities    
Net income $ 91,550 $ 60,417
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 98,128 97,126
Demand side management program amortization 837 837
Deferred income taxes (2,306) 48,099
Amortization of investment tax credits (26) (66)
Allowance for equity funds used during construction (6,618) (4,004)
Net derivative losses 31 31
Other, net (5) 10
Changes in operating assets and liabilities:    
Accounts receivable (25,351) (12,210)
Accrued unbilled revenues 2,329 (16,668)
Inventories 7,915 5,411
Prepayments and other 671 7,028
Accounts payable 640 16,799
Net regulatory assets and liabilities 46,163 (3,477)
Other current liabilities 13,937 (2,896)
Pension and other employee benefit obligations (7,885) (21,946)
Change in other noncurrent assets 4,397 (373)
Change in other noncurrent liabilities (458) (2,351)
Net cash provided by operating activities 223,949 171,767
Investing activities    
Utility capital/construction expenditures (478,352) (279,918)
Allowance for equity funds used during construction 6,618 4,004
Investments in utility money pool arrangement 46,000 0
Repayments from utility money pool arrangement 111,000 0
Payments for (Proceeds from) Other Investing Activities 0 (493)
Net cash used in investing activities (406,734) (276,407)
Financing activities    
Proceeds from short-term borrowings, net 132,000 56,000
Borrowings under utility money pool arrangement 180,000 572,000
Repayments under utility money pool arrangement (80,000) (511,000)
Capital contributions from parent 360 45,000
Repayment of long-term debt 0 (18)
Dividends paid to parent (60,008) (57,585)
Proceeds from (Payments for) Other Financing Activities (31) 0
Net cash provided by financing activities 172,321 104,397
Net change in cash and cash equivalents (10,464) (243)
Cash and cash equivalents at beginning of period 10,871 844
Cash and cash equivalents at end of period 407 601
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (36,680) (40,450)
Cash (paid) received for income taxes, net (7,560) 17,213
Supplemental disclosure of non-cash investing transactions:    
Property, plant and equipment additions in accounts payable $ 43,286 $ 34,529