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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating Activities:    
Net Income $ 174,177 $ 164,934
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 125,051 110,161
Deferred income taxes and investment tax credits (195) 30,077
Changes in regulatory assets and liabilities 61,968 13,502
Pension and postretirement benefit plan expense 21,687 22,175
Contributions to pension and postretirement benefit plans (45,158) (43,851)
Earnings of unconsolidated equity-method investments (7,269) (13,650)
Distributions from unconsolidated equity-method investments 18,350 17,114
Allowance for equity funds used during construction (16,555) (16,153)
Other non-cash adjustments to net income, net 5,220 3,876
Change in:    
Accounts receivable (20,520) (12,435)
Accounts payable and other accrued liabilities (32,494) (10,033)
Taxes accrued/receivable 54,687 8,490
Other current assets 18,736 7,343
Other current liabilities (3,010) (5,451)
Other assets (5,357) (1,277)
Other liabilities (494) 595
Net cash provided by operating activities 348,824 275,417
Investing Activities:    
Additions to property, plant and equipment (207,340) (199,966)
Payments received from transmission project joint funding partners 5,934 6,853
Proceeds from the sale of emission allowances and renewable energy certificates 1,892 969
Purchase of available-for-sale securities (3,248) (9,843)
Proceeds from the sale of available-for-sale securities 3,755 14,453
Purchase of Life Insurance Investment 0 (10,000)
Other 183 (9)
Net cash used in investing activities (198,824) (197,543)
Financing Activities:    
Issuance of long-term debt 0 120,000
Retirement of long-term debt (1,064) (101,064)
Dividends on common stock (83,441) (77,350)
Net change in short-term borrowings (19,375) (14,600)
Acquisition of treasury stock (3,189) (3,287)
Make-whole premium on retirement of long-term debt 0 (13,895)
Other 0 (1,684)
Net cash used in financing activities (107,069) (91,880)
Net increase (decrease) in cash and cash equivalents 42,931 (14,006)
Cash and cash equivalents at beginning of the period 61,480 114,802
Cash and cash equivalents at end of the period 104,411 100,796
Supplemental Disclosure of Cash Flow Information:    
Income taxes 1,702 2,187
Interest (net of amount capitalized) 60,257 60,224
Non-cash investing activities:    
Additions to property, plant and equipment in accounts payable 23,502 21,583
Idaho Power Company    
Operating Activities:    
Net Income 169,192 160,370
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 124,599 109,704
Deferred income taxes and investment tax credits 1,972 12,679
Changes in regulatory assets and liabilities 61,965 13,502
Pension and postretirement benefit plan expense 21,704 22,191
Contributions to pension and postretirement benefit plans (45,174) (43,867)
Earnings of unconsolidated equity-method investments (5,068) (11,528)
Distributions from unconsolidated equity-method investments 17,500 16,264
Allowance for equity funds used during construction (16,555) (16,153)
Other non-cash adjustments to net income, net 12 (571)
Change in:    
Accounts receivable (27,369) (12,319)
Accounts payable and other accrued liabilities 14,155 (10,016)
Taxes accrued/receivable 35,967 8,172
Other current assets 18,732 7,326
Other current liabilities (3,004) (5,451)
Other assets (5,358) (1,277)
Other liabilities (354) 789
Net cash provided by operating activities 362,916 249,815
Investing Activities:    
Additions to property, plant and equipment (207,327) (199,964)
Payments received from transmission project joint funding partners 5,934 6,853
Proceeds from the sale of emission allowances and renewable energy certificates 1,892 969
Purchase of available-for-sale securities (3,248) (9,843)
Proceeds from the sale of available-for-sale securities 3,755 14,453
Purchase of Life Insurance Investment 0 (10,000)
Other 46 (108)
Net cash used in investing activities (198,948) (197,640)
Financing Activities:    
Issuance of long-term debt 0 120,000
Retirement of long-term debt (1,064) (101,064)
Dividends on common stock (83,478) (77,365)
Net change in short-term borrowings (21,800) 0
Make-whole premium on retirement of long-term debt 0 (13,895)
Other 0 (1,671)
Net cash used in financing activities (106,342) (73,995)
Net increase (decrease) in cash and cash equivalents 57,626 (21,820)
Cash and cash equivalents at beginning of the period 44,140 110,756
Cash and cash equivalents at end of the period 101,766 88,936
Supplemental Disclosure of Cash Flow Information:    
Income taxes (27,556) 19,796
Interest (net of amount capitalized) 60,208 60,034
Non-cash investing activities:    
Additions to property, plant and equipment in accounts payable $ 23,502 $ 21,583