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STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Operating Activities:      
Net income $ 52,758 $ 62,640 $ 63,825
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation, amortization and accretion 49,283 41,339 39,764
Deferred income taxes and investment tax credits 22,053 30,554 23,885
Other - net 957 75 3,431
Changes in assets and liabilities:      
Accounts receivable – net (650) (9,359) 3,106
Unamortized purchased gas adjustments 23,141 (14,955) (2,001)
Deferred purchased gas costs 13,300 11,090 44,565
Accounts payable 35,445 (8,790) (4,860)
Advance customer billings – net (8,248) 9,916 (1,579)
Taxes accrued 3,666 (1,169) 1,387
Natural gas stored underground (30,626) 22,441 (1,594)
Other assets and liabilities 2,835 (15,681) (2,742)
Net cash provided by operating activities 163,914 128,101 167,187
Investing Activities:      
Capital expenditures (130,788) (108,843) (67,638)
Other investments (2,511) 3,439 631
Acquisition of MGE (975,000) 0 0
Net cash used in investing activities (1,108,299) (105,404) (67,007)
Financing Activities:      
Issuance of first mortgage bonds 550,000 0 0
Maturity of first mortgage bonds (25,000) 0 (25,000)
Issuance (Repayment) of short-term debt - net 33,900 (5,900) (83,650)
Notes Payable Issued 25,000 0 0
Change in book overdrafts (1,255) 1,455 (545)
Issuance of common stock 431,682 4,311 2,549
Non-employee directors’ restricted stock awards 0 (565) (494)
Dividends paid (42,518) (36,896) (35,821)
Employees’ taxes paid associated with restricted shares withheld upon vesting (931) (1,203) (1,162)
Excess tax benefits from stock-based compensation 1,778 338 314
Other (2,747) (57) (13)
Net cash provided by (used in) financing activities 969,909 (38,517) (143,822)
Net (Decrease) Increase in Cash and Cash Equivalents 25,524 (15,820) (43,642)
Cash and Cash Equivalents at Beginning of Year 27,457 43,277 86,919
Cash and Cash Equivalents at End of Year 52,981 27,457 43,277
Supplemental Disclosure of Cash Paid (Refunded) During the Year for:      
Interest 26,304 24,557 25,332
Income taxes $ (9,375) $ 1,540 $ 6,860