Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 45,286	$ 36,812
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	14,450	13,571
Deferred income taxes, net	5,157	6,554
Provision for uncollectible accounts	2,249	2,106
Other, net	(124)	514
Net change in:
Accounts receivable and accrued utility revenues	(114,184)	(97,349)
Inventories	8,985	5,473
Deferred fuel and power costs	2,086	4,845
Accounts payable	13,198	292
Other current assets	802	8,936
Other current liabilities	24,405	(7,126)
Net cash provided (used) by operating activities	2,310	(25,372)
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for property, plant and equipment	(34,254)	(29,728)
Net costs of property, plant and equipment disposals	(1,491)	(322)
Decrease (increase) in restricted cash	3,181	(2,106)
Net cash used by investing activities	(32,564)	(32,156)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of dividends	(17,536)	0
Increase in bank loans	56,000	63,900
Other	91	293
Net cash provided by financing activities	38,555	64,193
Cash and cash equivalents increase	8,301	6,665
CASH AND CASH EQUIVALENTS:
End of period	13,008	7,924
Beginning of period	4,707	1,259
Increase	$ 8,301	$ 6,665