Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
WGL Holdings, Inc.
OPERATING ACTIVITIES
Net income	$ 148,602	$ 137,018
ADJUSTMENTS TO RECONCILE NET INCOME TO NET CASH PROVIDED BY OPERATING ACTIVITIES
Depreciation and amortization	68,124	72,032
Amortization of:
Other regulatory assets and liabilities-net	2,748	2,957
Debt related costs	671	570
Deferred income taxes-net	48,563	75,043
Accrued/deferred pension cost (income)	13,131	8,798
Compensation expense related to equity awards	2,027	1,812
Provision for doubtful accounts	15,783	13,739
Other non-cash charges (credits)-net	(1,654)	(144)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable and unbilled revenues-net	(68,469)	(78,638)
Gas costs and other regulatory assets/liabilities-net	24,369	54,484
Storage gas	34,458	80,796
Other prepayments	18,455	11,084
Accounts payable and other accrued liabilities	46,220	(9,603)
Wages payable	2,712	3,453
Customer deposits and advance payments	(1,544)	(9,752)
Accrued taxes	22,927	2,783
Accrued interest	8,440	8,405
Other current assets	7,887	(3,001)
Other current liabilities	(30,119)	10,945
Deferred gas costs-net	(1,333)	29,946
Deferred assets-other	31,752	(41,692)
Deferred liabilities-other	(32,794)	(2,418)
Other-net	2,239	91
Net Cash Provided by (Used in) Operating Activities	363,195	368,708
FINANCING ACTIVITIES
Common stock issued	11,299	14,141
Long-term debt issued	75,000	51,502
Long-term debt retired	(30,000)	(74,379)
Debt issuance costs	(167)	(330)
Notes payable issued (retired)-net	(87,417)	(176,789)
Dividends on common stock and preferred stock	(59,413)	(57,048)
Other financing activities-net	(3,552)	(894)
Net Cash Used in Financing Activities	(94,250)	(243,797)
INVESTING ACTIVITIES
Capital expenditures (excluding Allowance for Funds Used During Construction)	(128,710)	(84,473)
Investment in non-utility interests	(10,054)	0
Net Cash Used in Investing Activities	(138,764)	(84,473)
INCREASE IN CASH AND CASH EQUIVALENTS	130,181	40,438
Cash and Cash Equivalents at Beginning of Year	8,849	7,845
Cash and Cash Equivalents at End of Period	139,030	48,283
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Income taxes paid - net	2,453	49,662
Interest paid	21,972	21,182
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Project debt financing activities - net	(3,539)	0
Capital expenditures included in accounts payable and other accrued liabilities	18,487	3,218
Washington Gas Light Company
OPERATING ACTIVITIES
Net income	107,943	121,599
ADJUSTMENTS TO RECONCILE NET INCOME TO NET CASH PROVIDED BY OPERATING ACTIVITIES
Depreciation and amortization	66,533	70,610
Amortization of:
Other regulatory assets and liabilities-net	(2,954)	2,957
Debt related costs	671	570
Deferred income taxes-net	33,136	77,983
Accrued/deferred pension cost (income)	13,024	8,133
Compensation expense related to equity awards	1,934	1,737
Provision for doubtful accounts	12,650	10,701
Other non-cash charges (credits)-net	(2,695)	(850)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable and unbilled revenues-net	(50,528)	(38,539)
Gas costs and other regulatory assets/liabilities-net	24,369	54,484
Storage gas	45,760	51,078
Other prepayments	13,638	(14,438)
Accounts payable and other accrued liabilities	5,028	(15,583)
Wages payable	2,629	3,223
Customer deposits and advance payments	456	(9,752)
Accrued taxes	8,122	1,967
Accrued interest	8,440	8,405
Other current assets	5,000	2,033
Other current liabilities	(10,921)	(1,231)
Deferred gas costs-net	(1,333)	29,946
Deferred assets-other	30,539	(32,053)
Deferred liabilities-other	(14,905)	(7,295)
Other-net	2,559	292
Net Cash Provided by (Used in) Operating Activities	299,095	325,977
FINANCING ACTIVITIES
Long-term debt issued	75,000	51,502
Long-term debt retired	(30,000)	(74,379)
Debt issuance costs	(167)	(330)
Notes payable issued (retired)-net	(43,419)	(124,791)
Dividends on common stock and preferred stock	(55,587)	(54,794)
Other financing activities-net	(434)	(788)
Net Cash Used in Financing Activities	(54,607)	(203,580)
INVESTING ACTIVITIES
Capital expenditures (excluding Allowance for Funds Used During Construction)	(112,575)	(80,915)
Net Cash Used in Investing Activities	(112,575)	(80,915)
INCREASE IN CASH AND CASH EQUIVALENTS	131,913	41,482
Cash and Cash Equivalents at Beginning of Year	4,390	5,160
Cash and Cash Equivalents at End of Period	136,303	46,642
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Income taxes paid - net	0	38,713
Interest paid	21,870	21,044
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Project debt financing activities - net	(3,539)	0
Capital expenditures included in accounts payable and other accrued liabilities	$ 18,431	$ 3,206