CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 9,541	$ 22,659
Accounts receivable
Allowance for doubtful accounts	(12,946)	(15,048)
Accounts receivable, net of allowance for doubtful accounts of $12,946 at December 31, 2011, and $15,048 at December 31, 2010	231,925	286,849
Inventories
Storage gas inventory	44,047	36,706
Materials and supplies	26,420	19,045
Liquified natural gas in storage	3,545	3,551
Regulatory asset	57,143	28,286
Income tax receivable	7,343	44,489
Deferred income taxes	48,818	32,732
Prepayments and other	15,386	11,966
Total current assets	444,168	486,283
Property, Plant and Equipment
Oil and gas properties, successful efforts method	5,166,368	4,080,779
Less accumulated depreciation, depletion and amortization	1,382,526	1,161,635
Oil and gas properties, net	3,783,842	2,919,144
Utility plant	1,358,266	1,292,611
Less accumulated depreciation	544,838	509,989
Utility plant, net	813,428	782,622
Other property, net	23,506	17,461
Total property, plant and equipment, net	4,620,776	3,719,227
Other Assets
Regulatory asset	95,633	105,365
Pension and other postretirement assets	0	13,907
Long-term derivative instruments	31,056	0
Deferred charges and other	45,783	38,778
Total other assets	172,472	158,050
TOTAL ASSETS	5,237,416	4,363,560
Current Liabilities
Long-term debt due within one year	1,000	5,000
Notes payable to banks	15,000	305,000
Accounts payable	302,048	268,214
Accrued taxes	32,359	52,845
Customers' deposits	23,950	20,459
Amounts due customers	21,065	20,161
Accrued wages and benefits	35,258	25,203
Regulatory liability	58,279	75,703
Royalty payable	22,592	19,221
Deferred income taxes	1,469	4,634
Other	32,328	26,805
Total current liabilities	543,879	818,611
Long-term debt	1,153,700	405,254
Deferred Credits and Other Liabilities
Asset retirement obligation	107,340	97,415
Pension and other postretirement liabilities	62,532	36,551
Regulatory liability	87,234	110,447
Deferred income taxes	806,127	615,084
Long-term derivative instruments	34,663	112,936
Other	9,778	13,219
Total deferred credits and other liabilities	1,107,674	985,652
Commitments and Contingencies
Shareholders' Equity
Preferred stock, cumulative $0.01 par value	0	0
Common shareholders' equity
Common stock, $0.01 par value	750	748
Premium on capital stock	482,918	468,934
Capital surplus	2,802	2,802
Retained earnings	2,100,885	1,880,183
Accumulated other comprehensive income (loss), net of tax
Unrealized gain (loss) on hedges, net	9,273	(43,667)
Pension and postretirement plans	(38,584)	(30,730)
Interest rate swap	(941)	0
Deferred compensation plan	3,511	3,288
Treasury stock, at cost; 3,036,549 shares and 3,024,847 shares at December 31, 2011 and 2010, respectively	(128,451)	(127,515)
Total shareholders' equity	2,432,163	2,154,043
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	5,237,416	4,363,560
Alabama Gas Corporation
Current Assets
Cash and cash equivalents	7,817	16,910
Accounts receivable
Gas	96,812	136,800
Other	6,858	10,229
Affiliated companies	2,841	698
Allowance for doubtful accounts	(12,100)	(14,200)
Inventories
Storage gas inventory	44,047	36,706
Materials and supplies	4,183	4,147
Liquified natural gas in storage	3,545	3,551
Regulatory asset	57,143	28,286
Income tax receivable	9,762	10,315
Deferred income taxes	21,986	27,302
Prepayments and other	4,422	4,223
Total current assets	247,316	264,967
Property, Plant and Equipment
Utility plant	1,358,266	1,292,611
Less accumulated depreciation	544,838	509,989
Utility plant, net	813,428	782,622
Other property, net	43	43
Other Assets
Regulatory asset	95,633	105,365
Pension and other postretirement assets	0	9,201
Deferred charges and other	10,380	5,399
Total other assets	106,013	119,965
TOTAL ASSETS	1,166,800	1,167,597
Current Liabilities
Long-term debt due within one year	0	5,000
Notes payable to banks	15,000	70,000
Accounts payable	110,552	83,515
Accrued taxes	26,861	48,476
Customers' deposits	23,950	20,459
Amounts due customers	21,065	20,161
Accrued wages and benefits	12,971	11,851
Regulatory liability	58,279	75,703
Deferred income taxes	1,348	1,244
Other	9,250	11,822
Total current liabilities	277,928	346,987
Long-term debt	250,246	200,793
Deferred Credits and Other Liabilities
Pension and other postretirement liabilities	21,383	4,733
Regulatory liability	87,234	110,447
Deferred income taxes	181,492	141,780
Long-term derivative instruments	3,070	32,461
Other	709	3,077
Total deferred credits and other liabilities	293,888	292,498
Commitments and Contingencies
Shareholders' Equity
Preferred stock, cumulative $0.01 par value	0	0
Common shareholders' equity
Common stock, $0.01 par value	20	20
Premium on capital stock	31,682	31,682
Capital surplus	2,802	2,802
Retained earnings	310,234	292,815
Accumulated other comprehensive income (loss), net of tax
Total shareholders' equity	344,738	327,319
Total capitalization	594,984	528,112
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,166,800	$ 1,167,597