|UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D. C. 20549
FORM 10-Q
|----------------------------------------------------------------------------------

||X| | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2005 | 
|--- | ------------------------------------------------------------------------------------------------------------------------------------ | 
|    |                                                                                                                                      | 

|OR
|--

||  | | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ___ TO ___ | 
|---- | ---------------------------------------------------------------------------------------------------------------------------------- | 
|     |                                                                                                                                    | 

| | Commission |                         |               | IRS Employer   | 
| | ---------- | ----------------------- | ------------- | -------------- | 
| | File       |                         | State of      | Identification | 
| | Number     | Registrant              | Incorporation | Number         | 
| |            |                         |               |                | 
| |            |                         |               |                | 
| | 1-7810     | Energen Corporation     | Alabama       | 63-0757759     | 
| | 2-38960    | Alabama Gas Corporation | Alabama       | 63-0022000     | 

|605 Richard Arrington Jr. Boulevard North
Birmingham, Alabama 35203-2707
Telephone Number 205/326-2700
http://www.energen.com
Alabama Gas Corporation, a wholly owned subsidiary of Energen Corporation, meets the conditions set forth in General Instruction H(1)(a) and (b) of Form 10-Q and is therefore filing this Form with reduced disclosure format pursuant to General Instruction H(2).
Indicate by a check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities and Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. YESXNO ____
Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act).
Energen Corporation YESXNO ___
Alabama Gas Corporation YES___ NOX
Indicate the number of shares outstanding of each of the issuers' classes of common stock, as of August 2, 2005
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | Energen Corporation     | $0.01 par value | 73,284,093 shares | 
| | ----------------------- | --------------- | ----------------- | 
| | Alabama Gas Corporation | $0.01 par value | 1,972,052 shares  | 







|                                               
|-----------------------------------------------
|ENERGEN CORPORATION AND ALABAMA GAS CORPORATION
|FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2005  
|                                               
|TABLE OF CONTENTS                              
|                                               
|                                               
|                                               
|PART I: FINANCIAL INFORMATION                  
|                                               
|                                               
|Item 1.                                        
|                                               
|                                               
|                                               
|                                               
|                                               
|                                               
|                                               
|Item 2.                                        
|                                               
|Item 3.                                        
|Item 4.                                        
|                                               
|                                               
|Item 2.                                        
|                                               
|Item 6.                                        
|                                               
|SIGNATURES                                     













|PART I. FINANCIAL INFORMATION                         |                    |               |                 
|----------------------------------------------------- | ------------------ | ------------- | ----------------
|ITEM 1. FINANCIAL STATEMENTS                          |                    |               |                 
|                                                      |                    |               |                 
|CONSOLIDATED CONDENSED STATEMENTS OF INCOME           |                    |              
|ENERGEN CORPORATION                                   |                    |               |                 
|(Unaudited)                                           |                    |               |                 
|                                                      | Three months ended |               | Six months ended
|                                                      | June 30,           |               | June 30,        
|(in thousands, except per share data)                 | 2005               | 2004          |                 
|Operating Revenues                                    |                    |               |                 
|Oil and gas operations                                | $  134,453         | $   95,322    |                 
|Natural gas distribution                              | 107,197            | 92,744        |                 
|Total operating revenues                              | 241,650            | 188,066       |                 
|                                                      |                    |               |                 
|Operating Expenses                                    |                    |               |                 
|Cost of gas                                           | 50,424             | 40,291        |                 
|Operations and maintenance                            | 66,904             | 56,242        |                 
|Depreciation, depletion and amortization              | 33,101             | 28,885        |                 
|Taxes, other than income taxes                        | 19,794             | 16,040        |                 
|Accretion expense                                     | 654                | 532           |                 
|Total operating expenses                              | 170,877            | 141,990       |                 
|Operating Income                                      | 70,773             | 46,076        |                 
|                                                      |                    |               |                 
|Other Income (Expense)                                |                    |               |                 
|Interest expense                                      | (11,524)           | (10,694)      |                 
|Other income                                          | 517                | 633           |                 
|Other expense                                         | (268)              | (670)         |                 
|Total other expense                                   | (11,275)           | (10,731)      |                 
|                                                      |                    |               |                 
|Income From Continuing Operations Before Income Taxes | 59,498             | 35,345        |                 
|Income tax expense                                    | 21,910             | 13,114        |                 
|Income From Continuing Operations                     | 37,588             | 22,231        |                 
|                                                      |                    |               |                 
|Discontinued Operations, net of taxes                 |                    |               |                 
|Income (loss) from discontinued operations            | (2)                | 39            |                 
|Gain (loss) on disposal of discontinued operations    | (13)               | -             |                 
|Income (Loss) From Discontinued Operations            | (15)               | 39            |                 
|                                                      |                    |               |                 
|Net Income                                            | $    37,573        | $    22,270   |                 
|                                                      |                    |               |                 
|Diluted Earnings Per Average Common Share*            |                    |               |                 
|Continuing operations                                 | $       0.51       | $       0.30  |                 
|Discontinued operations                               | -                  | -             |                 
|Net Income                                            | $        0.51      | $        0.30 |                 
|Basic Earnings Per Average Common Share*              |                    |               |                 
|Continuing operations                                 | $       0.51       | $      0.31   |                 
|Discontinued operations                               | -                  | -             |                 
|Net Income                                            | $     0.51         | $     0.31    |                 
|Dividends Per Common Share*                           | $      0.100       | $    0.0925   |                 
|Diluted Average Common Shares Outstanding*            | 73,782             | 73,249        |                 
|Basic Average Common Shares Outstanding*              | 73,017             | 72,459        |                 

*Share and per share data have been restated to reflect a 2-for-1 stock split payable June 1, 2005 (see Note 15)

The accompanying notes are an integral part of these condensed financial statements.





|CONSOLIDATED CONDENSED BALANCE SHEETS                                                                                             |                |                  
|--------------------------------------------------------------------------------------------------------------------------------- | -------------- | -----------------
|ENERGEN CORPORATION                                                                                                               |                |                  
|(Unaudited)                                                                                                                       |                |                  
|                                                                                                                                  |                |                  
|(in thousands)                                                                                                                    | June 30, 2005  | December 31, 2004
|                                                                                                                                  |                |                  
|ASSETS                                                                                                                            |                |                  
|Current Assets                                                                                                                    |                |                  
|Cash and cash equivalents                                                                                                         | $       75,398 | $       4,489    
|Accounts receivable, net of allowance for doubtful
    accounts of $10,378 at June 30, 2005, and
    $10,472 at December 31, 2004 | 129,492        | 217,360          
|Inventories, at average cost                                                                                                      |                |                  
|Storage gas inventory                                                                                                             | 53,465         | 51,093           
|Materials and supplies                                                                                                            | 6,923          | 7,843            
|Liquified natural gas in storage                                                                                                  | 3,220          | 3,688            
|Deferred income taxes                                                                                                             | 56,280         | 36,285           
|Prepayments and other                                                                                                             | 19,594         | 29,150           
|                                                                                                                                  |                |                  
|                                                                                                                                  |                |                  
|Total current assets                                                                                                              | 344,372        | 349,908          
|                                                                                                                                  |                |                  
|                                                                                                                                  |                |                  
|Property, Plant and Equipment                                                                                                     |                |                  
|Oil and gas properties, successful efforts method                                                                                 | 1,667,634      | 1,591,119        
|Less accumulated depreciation, depletion and amortization                                                                         | 422,115        | 381,734          
|                                                                                                                                  |                |                  
|Oil and gas properties, net                                                                                                       | 1,245,519      | 1,209,385        
|                                                                                                                                  |                |                  
|Utility plant                                                                                                                     | 976,441        | 941,862          
|Less accumulated depreciation                                                                                                     | 389,106        | 373,589          
|                                                                                                                                  |                |                  
|Utility plant, net                                                                                                                | 587,335        | 568,273          
|                                                                                                                                  |                |                  
|Other property, net                                                                                                               | 5,426          | 5,401            
|                                                                                                                                  |                |                  
|                                                                                                                                  |                |                  
|Total property, plant and equipment, net                                                                                          | 1,838,280      | 1,783,059        
|                                                                                                                                  |                |                  
|                                                                                                                                  |                |                  
|Other Assets                                                                                                                      |                |                  
|Regulatory asset                                                                                                                  | 19,650         | 19,650           
|Deferred charges and other                                                                                                        | 34,261         | 29,122           
|                                                                                                                                  |                |                  
|                                                                                                                                  |                |                  
|Total other assets                                                                                                                | 53,911         | 48,772           
|                                                                                                                                  |                |                  
|                                                                                                                                  |                |                  
|TOTAL ASSETS                                                                                                                      | $   2,236,563  | $   2,181,739    
|                                                                                                                                  |                |                  







|CONSOLIDATED CONDENSED BALANCE SHEETS                                                                                                                                |               |                  
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------- | -----------------
|ENERGEN CORPORATION                                                                                                                                                  |               |                  
|(Unaudited)                                                                                                                                                          |               |                  
|                                                                                                                                                                     |               |                  
|(in thousands, except share and per share data)                                                                                                                      | June 30, 2005 | December 31, 2004
|                                                                                                                                                                     |               |                  
|LIABILITIES AND SHAREHOLDERS' EQUITY                                                                                                                                 |               |                  
|Current Liabilities                                                                                                                                                  |               |                  
|Long-term debt due within one year                                                                                                                                   | $      10,000 | $      10,000    
|Notes payable to banks                                                                                                                                               | -             | 135,000          
|Accounts payable                                                                                                                                                     | 189,946       | 159,871          
|Accrued taxes                                                                                                                                                        | 41,558        | 34,541           
|Customers' deposits                                                                                                                                                  | 19,448        | 19,549           
|Amounts due customers                                                                                                                                                | -             | 10,363           
|Accrued wages and benefits                                                                                                                                           | 31,089        | 28,941           
|Regulatory liability                                                                                                                                                 | 32,546        | 47,060           
|Other                                                                                                                                                                | 50,286        | 53,293           
|                                                                                                                                                                     |               |                  
|                                                                                                                                                                     |               |                  
|Total current liabilities                                                                                                                                            | 374,873       | 498,618          
|                                                                                                                                                                     |               |                  
|                                                                                                                                                                     |               |                  
|Long-term debt                                                                                                                                                       | 692,925       | 612,891          
|                                                                                                                                                                     |               |                  
|                                                                                                                                                                     |               |                  
|Deferred Credits and Other Liabilities                                                                                                                               |               |                  
|Asset retirement obligation                                                                                                                                          | 36,455        | 34,841           
|Minimum pension liability                                                                                                                                            | 14,216        | 14,216           
|Regulatory liability                                                                                                                                                 | 115,858       | 111,928          
|Deferred income taxes                                                                                                                                                | 121,367       | 95,417           
|Other                                                                                                                                                                | 29,263        | 10,162           
|                                                                                                                                                                     |               |                  
|                                                                                                                                                                     |               |                  
|Total deferred credits and other liabilities                                                                                                                         | 317,159       | 266,564          
|                                                                                                                                                                     |               |                  
|                                                                                                                                                                     |               |                  
|Commitments and Contingencies                                                                                                                                        |               |                  
|                                                                                                                                                                     |               |                  
|                                                                                                                                                                     |               |                  
|Shareholders' equity                                                                                                                                                 |               |                  
|Preferred stock, cumulative $0.01 par value, 5,000,000
    shares authorized                                                                                         | -             | -                
|Common shareholders' equity*                                                                                                                                         |               |                  
|Common stock, $0.01 par value; 150,000,000 shares authorized, 73,313,678 shares outstanding at June 30, 2005, and 73,165,958 shares outstanding at December 31, 2004 | 733           | 732              
|Premium on capital stock                                                                                                                                             | 387,663       | 380,965          
|Capital surplus                                                                                                                                                      | 2,802         | 2,802            
|Retained earnings                                                                                                                                                    | 541,594       | 459,626          
|Accumulated other comprehensive loss, net of tax                                                                                                                     |               |                  
|Unrealized loss on hedges                                                                                                                                            | (65,295)      | (25,466)         
|Minimum pension liability                                                                                                                                            | (11,864)      | (11,864)         
|Deferred compensation on restricted stock                                                                                                                            | (3,056)       | (2,675)          
|Deferred compensation plan                                                                                                                                           | 36,904        | 28,919           
|Treasury stock, at cost* (1,088,034 shares at June 30, 2005,
    and 1,000,952 shares at December 31, 2004)                                                          | (37,875)      | (29,373)         
|                                                                                                                                                                     |               |                  
|Total shareholders' equity                                                                                                                                           | 851,606       | 803,666          
|                                                                                                                                                                     |               |                  
|                                                                                                                                                                     |               |                  
|TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY                                                                                                                           | $   2,236,563 | $   2,181,739    
|                                                                                                                                                                     |               |                  

*Share and per share data have been restated to reflect a 2-for-1 stock split payable June 1, 2005 (see Note 15)

The accompanying notes are an integral part of these condensed financial statements.

|CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS  |              
|------------------------------------------------ | -------------
|ENERGEN CORPORATION                              |              
|(Unaudited)                                      |              
|                                                 |              
|Six months ended June 30, (in thousands)         | 2005         
|                                                 |              
|Operating Activities                             |              
|Net income                                       | $     96,619 
|Adjustments to reconcile net income to net cash  |              
|provided by (used in) operating activities:      |              
|Depreciation, depletion and amortization         | 64,554       
|Deferred income taxes, net                       | 30,356       
|Deferred investment tax credits                  | -            
|Change in derivative fair value                  | 8,702        
|Gain on sale of assets                           | (1,455)      
|Other, net                                       | 3,572        
|Net change in:                                   |              
|Accounts receivable                              | 65,861       
|Inventories                                      | (984)        
|Accounts payable                                 | (25,131)     
|Amounts due customers                            | 1,271        
|Other current assets and liabilities             | 9,927        
|                                                 |              
|                                                 |              
|Net cash provided by operating activities        | 253,292      
|                                                 |              
|                                                 |              
|Investing Activities                             |              
|Additions to property, plant and equipment       | (122,295)    
|Proceeds from sale of assets                     | 10,187       
|Other, net                                       | (484)        
|                                                 |              
|                                                 |              
|Net cash used in investing activities            | (112,592)    
|                                                 |              
|                                                 |              
|Financing Activities                             |              
|Payment of dividends on common stock             | (14,650)     
|Issuance of common stock                         | 2,880        
|Purchase of treasury stock                       | (1,128)      
|Reduction of long-term debt                      | (35)         
|Proceeds from issuance of long-term debt         | 80,000       
|Debt issuance costs                              | (1,858)      
|Net change in short-term debt                    | (135,000)    
|                                                 |              
|                                                 |              
|Net cash used in financing activities            | (69,791)     
|                                                 |              
|                                                 |              
|Net change in cash and cash equivalents          | 70,909       
|Cash and cash equivalents at beginning of period | 4,489        
|                                                 |              
|                                                 |              
|Cash and Cash Equivalents at End of Period       | $      75,398
|                                                 |              









|CONDENSED STATEMENTS OF INCOME |                    |      |                 
|------------------------------ | ------------------ | ---- | ----------------
|ALABAMA GAS CORPORATION        |                    |      |                 
|(Unaudited)                    |                    |      |                 
|                               | Three months ended |      | Six months ended
|                               | June 30,           |      | June 30,        
|(in thousands)                 | 2005               | 2004 |                 

|Operating Revenues                           | $ 107,197 | $ 92,744 |  | $ 365,325 | $ 347,946
|-------------------------------------------- | --------- | -------- |  | --------- | ---------
|                                             |           |          |  |           |          
|Operating Expenses                           |           |          |  |           |          
|Cost of gas                                  | 50,937    | 40,677   |  | 188,313   | 179,883  
|Operations and maintenance                   | 32,262    | 30,262   |  | 60,088    | 58,859   
|Depreciation                                 | 10,643    | 9,858    |  | 21,056    | 19,468   
|Income taxes                                 |           |          |  |           |          
|Current                                      | 1,900     | (1,388)  |  | 27,166    | 19,414   
|Deferred, net                                | (703)     | 1,620    |  | (2,170)   | 3,078    
|Deferred investment tax credits, net         | -         | (112)    |  | -         | (224)    
|Taxes, other than income taxes               | 7,725     | 7,372    |  | 23,834    | 23,147   
|                                             |           |          |  |           |          
|Total operating expenses                     | 102,764   | 88,289   |  | 318,287   | 303,625  
|                                             |           |          |  |           |          
|Operating Income                             | 4,433     | 4,455    |  | 47,038    | 44,321   
|                                             |           |          |  |           |          
|Other Income (Expense)                       |           |          |  |           |          
|Allowance for funds used during construction | 188       | 361      |  | 373       | 661      
|Other income                                 | 476       | 397      |  | 697       | 1,101    
|Other expense                                | (260)     | (670)    |  | (525)     | (1,686)  
|                                             |           |          |  |           |          
|Total other income                           | 404       | 88       |  | 545       | 76       
|                                             |           |          |  |           |          
|Interest Charges                             |           |          |  |           |          
|Interest on long-term debt                   | 3,559     | 2,763    |  | 6,972     | 5,750    
|Other interest expense                       | 205       | 1,221    |  | 534       | 1,769    
|                                             |           |          |  |           |          
|Total interest charges                       | 3,764     | 3,984    |  | 7,506     | 7,519    
|                                             |           |          |  |           |          
|Net Income                                   | $ 1,073   | $ 559    |  | $ 40,077  | $ 36,878 



The accompanying notes are an integral part of these condensed financial statements.







|CONDENSED BALANCE SHEETS         |               |                  
|-------------------------------- | ------------- | -----------------
|ALABAMA GAS CORPORATION          |               |                  
|(Unaudited)                      |               |                  
|                                 |               |                  
|(in thousands)                   | June 30, 2005 | December 31, 2004
|                                 |               |                  
|ASSETS                           |               |                  
|Property, Plant and Equipment    |               |                  
|Utility plant                    | $    976,441  | $    941,862     
|Less accumulated depreciation    | 389,106       | 373,589          
|                                 |               |                  
|                                 |               |                  
|Utility plant, net               | 587,335       | 568,273          
|                                 |               |                  
|                                 |               |                  
|Other property, net              | 172           | 325              
|                                 |               |                  
|                                 |               |                  
|Current Assets                   |               |                  
|Cash and cash equivalents        | 58,486        | 3,467            
|Accounts receivable              |               |                  
|Gas                              | 62,388        | 142,736          
|Other                            | 5,713         | 11,952           
|Affiliated companies             | 1,692         | 2,190            
|Allowance for doubtful accounts  | (9,600)       | (9,600)          
|Inventories, at average cost     |               |                  
|Storage gas inventory            | 53,465        | 51,093           
|Materials and supplies           | 3,502         | 4,281            
|Liquified natural gas in storage | 3,220         | 3,688            
|Deferred income taxes            | 16,432        | 15,233           
|Prepayments and other            | 13,049        | 21,901           
|                                 |               |                  
|                                 |               |                  
|Total current assets             | 208,347       | 246,941          
|                                 |               |                  
|                                 |               |                  
|Other Assets                     |               |                  
|Regulatory asset                 | 19,650        | 19,650           
|Deferred charges and other       | 6,673         | 4,558            
|                                 |               |                  
|                                 |               |                  
|Total other assets               | 26,323        | 24,208           
|                                 |               |                  
|                                 |               |                  
|TOTAL ASSETS                     | $    822,177  | $    839,747     
|                                 |               |                  











|CONDENSED BALANCE SHEETS                                                                                                                      |                 |                  
|--------------------------------------------------------------------------------------------------------------------------------------------- | --------------- | -----------------
|ALABAMA GAS CORPORATION                                                                                                                       |                 |                  
|(Unaudited)                                                                                                                                   |                 |                  
|                                                                                                                                              |                 |                  
|(in thousands, except share data)                                                                                                             | June 30, 2005   | December 31, 2004
|                                                                                                                                              |                 |                  
|LIABILITIES AND CAPITALIZATION                                                                                                                |                 |                  
|Capitalization                                                                                                                                |                 |                  
|Preferred stock, cumulative $0.01 par value, 120,000 shares
    authorized                                                                    | $             - | $-               
|Common shareholder's equity                                                                                                                   |                 |                  
|Common stock, $0.01 par value; 3,000,000 shares
       authorized, 1,972,052 shares outstanding at
       June 30, 2005 and December 31, 2004 | 20              | 20               
|Premium on capital stock                                                                                                                      | 31,682          | 31,682           
|Capital surplus                                                                                                                               | 2,802           | 2,802            
|Retained earnings                                                                                                                             | 248,950         | 223,515          
|                                                                                                                                              |                 |                  
|                                                                                                                                              |                 |                  
|Total common shareholder's equity                                                                                                             | 283,454         | 258,019          
|Long-term debt                                                                                                                                | 209,415         | 129,450          
|                                                                                                                                              |                 |                  
|                                                                                                                                              |                 |                  
|Total capitalization                                                                                                                          | 492,869         | 387,469          
|                                                                                                                                              |                 |                  
|                                                                                                                                              |                 |                  
|Current Liabilities                                                                                                                           |                 |                  
|Long-term debt due within one year                                                                                                            | 10,000          | 10,000           
|Notes payable to banks                                                                                                                        | -               | 82,000           
|Accounts payable                                                                                                                              | 47,305          | 81,591           
|Accrued taxes                                                                                                                                 | 42,346          | 27,410           
|Customers' deposits                                                                                                                           | 19,448          | 19,549           
|Amounts due customers                                                                                                                         | -               | 10,363           
|Accrued wages and benefits                                                                                                                    | 7,796           | 7,724            
|Regulatory liability                                                                                                                          | 32,546          | 47,060           
|Other                                                                                                                                         | 11,122          | 11,906           
|                                                                                                                                              |                 |                  
|                                                                                                                                              |                 |                  
|Total current liabilities                                                                                                                     | 170,563         | 297,603          
|                                                                                                                                              |                 |                  
|                                                                                                                                              |                 |                  
|Deferred Credits and Other Liabilities                                                                                                        |                 |                  
|Deferred income taxes                                                                                                                         | 39,110          | 40,070           
|Regulatory liability                                                                                                                          | 115,858         | 111,928          
|Other                                                                                                                                         | 3,777           | 2,677            
|                                                                                                                                              |                 |                  
|                                                                                                                                              |                 |                  
|Total deferred credits and other liabilities                                                                                                  | 158,745         | 154,675          
|                                                                                                                                              |                 |                  
|                                                                                                                                              |                 |                  
|Commitments and Contingencies                                                                                                                 |                 |                  
|                                                                                                                                              |                 |                  
|                                                                                                                                              |                 |                  
|TOTAL LIABILITIES AND CAPITALIZATION                                                                                                          | $    822,177    | $    839,747     
|                                                                                                                                              |                 |                  











|CONDENSED STATEMENTS OF CASH FLOWS               |              |               
|------------------------------------------------ | ------------ | --------------
|ALABAMA GAS CORPORATION                          |              |               
|(Unaudited)                                      |              |               
|                                                 |              |               
|Six months ended June 30, (in thousands)         | 2005         | 2004          
|                                                 |              |               
|Operating Activities                             |              |               
|Net income                                       | $     40,077 | $     36,878  
|Adjustments to reconcile net income to net cash  |              |               
|provided by (used in) operating activities:      |              |               
|Depreciation and amortization                    | 21,056       | 19,468        
|Deferred income taxes, net                       | (2,170)      | 3,078         
|Deferred investment tax credits                  | -            | (224)         
|Other, net                                       | 2,061        | 2,700         
|Net change in:                                   |              |               
|Accounts receivable                              | 64,580       | 50,071        
|Inventories                                      | (1,125)      | 12,047        
|Accounts payable                                 | (34,286)     | (3,955)       
|Amounts due customers                            | 1,271        | (14,560)      
|Other current assets and liabilities             | 17,446       | 16,136        
|                                                 |              |               
|                                                 |              |               
|Net cash provided by operating activities        | 108,910      | 121,639       
|                                                 |              |               
|                                                 |              |               
|Investing Activities                             |              |               
|Additions to property, plant and equipment       | (35,484)     | (29,517)      
|Other, net                                       | (520)        | (11)          
|                                                 |              |               
|                                                 |              |               
|Net cash used in investing activities            | (36,004)     | (29,528)      
|                                                 |              |               
|                                                 |              |               
|Financing Activities                             |              |               
|Dividends                                        | (14,642)     | (13,423)      
|Reduction of long-term debt                      | (35)         | (30,033)      
|Proceeds from issuance of long-term debt         | 80,000       | -             
|Debt issuance costs                              | (1,708)      | -             
|Net advances from (to) affiliates                | 498          | (36,291)      
|Net change in short-term debt                    | (82,000)     | (11,000)      
|                                                 |              |               
|                                                 |              |               
|Net cash used in financing activities            | (17,887)     | (90,747)      
|                                                 |              |               
|                                                 |              |               
|Net change in cash and cash equivalents          | 55,019       | 1,364         
|Cash and cash equivalents at beginning of period | 3,467        | 1,440         
|                                                 |              |               
|                                                 |              |               
|Cash and Cash Equivalents at End of Period       | $     58,486 | $        2,804
|                                                 |              |               







|NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS
ENERGEN CORPORATION AND ALABAMA GAS CORPORATION
|-------------------------------------------------------------------------------------------------
|                                                                                                 

|1. BASIS OF PRESENTATION
The unaudited condensed financial statements and notes should be read in conjunction with the financial statements and notes thereto for the years ended December 31, 2004, 2003 and 2002 included in the 2004 Annual Report of Energen Corporation (the Company) and Alabama Gas Corporation (Alagasco) on Form 10-K. Alagasco has a September 30 fiscal year for rate-setting purposes (rate year) and reports on a calendar year for the Securities and Exchange Commission and all other financial accounting reporting purposes. The accompanying unaudited condensed financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the disclosures required for complete financial statements. The Company's natural gas distribution business is seasonal in character and influenced by weather conditions. Results of operations for interim periods are not necessarily indicative of the results that may be expected for the year.
The quarterly information reflects the application of Statement of Financial Accounting Standard (SFAS) No. 144, "Accounting for Impairment or Disposal of Long-Lived Assets." SFAS No. 144 requires that gains and losses from the sale of certain oil and gas properties and write-downs of certain properties held-for-sale be reported as discontinued operations, with income or loss from operations of the associated properties reported as income or loss from discontinued operations in the current and prior periods. All other adjustments to the unaudited financial statements that are, in the opinion of management, necessary for a fair statement of the results for the interim periods have been recorded. Such adjustments consisted of normal recurring items. Certain reclassifications were made to conform prior years' financial statements to the current-quarter presentation.
2. STOCK-BASED COMPENSATION
The Company adopted the fair value recognition provisions of SFAS No. 123 (as amended), "Accounting for Stock-Based Compensation," prospectively for all stock-based employee compensation effective as of January 1, 2003. Awards under the Company's plan vest over periods ranging from one to six years. The cost related to stock-based employee compensation included in the determination of net income for the three months and six months ended June 30, 2005 and 2004, approximates that which would have been recognized if the fair value method had been applied to all awards since the original effective date of SFAS No. 123. The following table illustrates the effect on net income and diluted and basic earnings per share as if the fair value based method had been applied to all outstanding and unvested awards in each period:
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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|(in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|As reported                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Stock-based compensation expense included in reported net income, net of tax                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Stock-based compensation expense determined under fair value based method, net of tax                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Pro forma                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Diluted earnings per average common share*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|As reported                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Pro forma                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Basic earnings per average common share*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|As reported                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Pro forma                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|*Share and per share data have been restated to reflect a 2-for-1 stock split payable June 1, 2005 (see Note 15)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

|3. REGULATORY
All of Alagasco's utility operations are conducted in the state of Alabama. Alagasco is subject to regulation by the Alabama Public Service Commission (APSC) which established the Rate Stabilization and Equalization (RSE) rate-setting process in 1983. RSE was extended with modifications in 2002, 1996, 1990, 1987 and 1985. On June 10, 2002, the APSC extended Alagasco's rate-setting methodology, RSE, without change, for a six-year period through January 1, 2008. Under the terms of that extension, RSE will continue after January 1, 2008, unless, after notice to the Company and a hearing, the Commission votes to either modify or discontinue its operation. Alagasco is on a September 30 fiscal year for rate-setting purposes and reports on a calendar year for the Securities and Exchange Commission and all other financial accounting reporting purposes. Alagasco's allowed range of return on average equity remains 13.15 percent to 13.65 percent throughout the term of the order, subject to change in the event that the Commission, following a generic rate of return hearing, adjusts the equity returns of all major energy utilities operating under a similar methodology. Under RSE, the APSC conducts quarterly reviews to determine, based on Alagasco's projections and year-to-date performance, whether Alagasco's return on average equity at the end of the rate year will be within the allowed range of return. Reductions in rates can be made quarterly to bring the projected return within the allowed range; increases, however, are allowed only once each rate year, effective December 1, and cannot exceed 4 percent of prior-year revenues. Alagasco did not have a reduction in rates related to the return on average equity for the rate year ended 2004. As of September 30, 2003, Alagasco had a $3 million reduction in revenues to bring the return on average equity within the allowed range of return. A $12.3 million and an $11.2 million annual increase in revenues became effective December 1, 2004 and 2003, respectively. RSE limits the utility's equity upon which a return is permitted to 60 percent of total capitalization and provides for certain cost control measures designed to monitor Alagasco's operations and maintenance (O&M) expense. Under the inflation-based cost control measurement established by the APSC, if the percentage change in O&M expense per customer falls within a range of 1.25 points above or below the percentage change in the Consumer Price Index For All Urban Consumers (index range), no adjustment is required. If the change in O&M expense per customer exceeds the index range, three-quarters of the difference is returned to customers. To the extent the change is less than the index range, the utility benefits by one-half of the difference through future rate adjustments. The increase in O&M expense per customer was above the index range for the rate year ended September 30, 2004; as a result, the utility returned $1.2 million pre-tax to customers through rate adjustments under the provisions of RSE.
Alagasco calculates a temperature adjustment to customers' monthly bills to substantially remove the effect of departures from normal temperatures on Alagasco's earnings. Adjustments to customers' bills are made in the same billing cycle in which the weather variation occurs. The temperature adjustment applies primarily to residential, small commercial and small industrial customers. This adjustment, however, is subject to certain limitations including regulatory limits on adjustments to increase customers' bills, the impact of non-temperature weather conditions such as wind velocity or cloud cover and the impact of any elasticity of demand as a result of high commodity prices. Alagasco's rate schedules for natural gas distribution charges contain a Gas Supply Adjustment (GSA) rider, established in 1993, which permits the pass-through to customers of changes in the cost of gas supply.
4. DERIVATIVE COMMODITY INSTRUMENTS
Energen Resources Corporation, Energen's oil and gas subsidiary, periodically enters into derivative commodity instruments that qualify as cash flow hedges under SFAS No. 133, "Accounting for Derivative Instruments and Hedging Activities," to hedge its exposure to price fluctuations on oil, natural gas and natural gas liquids production. In addition, Alagasco periodically enters into cash flow derivative commodity instruments to hedge its exposure to price fluctuations on its gas supply. Such instruments may include regulated natural gas and crude oil futures contracts traded on the New York Mercantile Exchange (NYMEX) and over-the-counter swaps, collars and basis hedges with major energy derivative product specialists. The counterparties to the commodity instruments are investment banks and energy-trading firms. In some contracts, the amount of credit allowed before collateral must be posted for out-of-the-money hedges varies depending on the credit rating of the Company or Alagasco. In cases where this arrangement exists, generally the credit ratings must be maintained at investment grade status to have available counterparty credit.
Energen Resources applies SFAS No. 133 which requires all derivatives to be recognized on the balance sheet and measured at fair value. If a derivative is designated as a cash flow hedge, the effectiveness of the hedge, or the degree that the gain (loss) for the hedging instrument offsets the loss (gain) on the hedged item is measured at each reporting period. The effective portion of the gain or loss on the derivative instrument is recognized in other comprehensive income (OCI) as a component of equity and subsequently reclassified into earnings as operating revenues when the forecasted transaction affects earnings. The ineffective portion of a derivative's change in fair value is required to be recognized in earnings immediately. Derivatives that do not qualify for hedge treatment under SFAS No. 133 must be recorded at fair value with gains or losses recognized in operating revenues in the period of change.
As of June 30, 2005, $52.4 million, net of tax, of deferred net losses on derivative instruments recorded in accumulated other comprehensive income are expected to be reclassified to operating revenues during the next 12-month period. The actual amounts that will be reclassified to earnings over the next year could vary materially from this amount due to changes in market conditions. Gains and losses on derivative instruments that are not accounted for as cash flow hedges as well as the ineffective portion of the change in fair value of derivatives accounted for as cash flow hedges, are included in operating revenues in the consolidated financial statements. For the ineffective portion of the change in fair value of derivatives accounted for as cash flow hedges, Energen Resources recorded a $0.8 million after-tax loss for the three months ended June 30, 2005, and a $2 million after-tax loss year-to-date. Also, Energen Resources recorded an after-tax gain of $4 million for the quarter and a $5.7 million after-tax loss year-to-date on contracts that did not meet the definition of cash flow hedges under SFAS No. 133. As of June 30, 2005, the Company had 5.77 billion cubic feet (Bcf) of gas hedges with a fair value pretax loss of $6.9 million which expire by year-end that did not meet the definition of a cash flow hedge but are considered by the Company to be viable economic hedges. The Company had $40 million and $15.6 million included in current and noncurrent deferred income taxes on the consolidated balance sheets related to OCI as of June 30, 2005 and December 31, 2004, respectively. At June 30, 2005, and December 31, 2004, the Company had $98.8 million and $40.7 million, respectively, recorded in accounts payable and $21 million and $3.2 million, respectively, recorded in other noncurrent liabilities related to derivative liabilities.
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------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|Energen Resources has entered into the following transactions for the remainder of 2005 and subsequent years:
|-------------------------------------------------------------------------------------------------------------
|Production Period                                                                                            
|Natural Gas                                                                                                  
|2005                                                                                                         
|                                                                                                             
|2006                                                                                                         
|                                                                                                             
|Natural Gas Basis Differential                                                                               
|2005                                                                                                         
|Oil                                                                                                          
|2005                                                                                                         
|                                                                                                             
|2006                                                                                                         
|Oil Basis Differential                                                                                       
|2005                                                                                                         
|2006                                                                                                         
|Natural Gas Liquids                                                                                          
|2005                                                                                                         
|2006                                                                                                         
|* Average contract prices are not meaningful due to the varying nature of each contract.                     



|All hedge transactions are subject to the Company's risk management policy, approved by the Board of Directors, which does not permit speculative positions. The Company formally documents all relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking the hedge. This process includes specific identification of the hedging instrument and the hedge transaction, the nature of the risk being hedged and how the hedging instrument's effectiveness in hedging the exposure to the hedged transaction's variability in cash flows attributable to the hedged risk will be assessed. Both at the inception of the hedge and on an ongoing basis, the Company assesses whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in cash flows of hedged items. The Company discontinues hedge accounting if a derivative has ceased to be a highly effective hedge. The maximum term over which Energen Resources has hedged exposures to the variability of cash flows is through December 31, 2006.
On December 4, 2000, the APSC authorized Alagasco to engage in energy risk-management activities to manage the utility's cost of gas supply. As required by SFAS No. 133, Alagasco recognizes all derivatives as either assets or liabilities on the balance sheet with a corresponding regulatory asset or liability. Any gains or losses are passed through to customers using the mechanisms of the GSA in compliance with Alagasco's APSC-approved tariff. In accordance with SFAS No. 71, Alagasco recorded a $4 million gain and an $8.1 million gain as a regulatory liability as of June 30, 2005 and December 31, 2004, respectively, with a corresponding asset in prepayments and other for $4 million and $8.1 million as of June 30, 2005 and December 31, 2004, respectively, representing the fair value of derivatives.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. RECONCILIATION OF EARNINGS PER SHARE
|---------------------------------------



|                                         | Three months ended | Three months ended
|---------------------------------------- | ------------------ | ------------------
|(in thousands, except per share amounts) | June 30, 2005      | June 30, 2004     
|                                         |                    |                   
|                                         | Income             | Shares            
|                                         |                    |                   
|Basic EPS*                               | $   37,573         | 73,017            
|Effect of Dilutive Securities            |                    |                   
|Long-range performance shares            |                    | 331               
|Stock options                            |                    | 376               
|Restricted stock                         |                    | 58                
|                                         |                    |                   
|Diluted EPS*                             | $   37,573         | 73,782            



|                                         | Six months ended | Six months ended
|---------------------------------------- | ---------------- | ----------------
|(in thousands, except per share amounts) | June 30, 2005    | June 30, 2004   
|                                         |                  |                 
|                                         | Income           | Shares          
|                                         |                  |                 
|Basic EPS*                               | $   96,619       | 72,985          
|Effect of Dilutive Securities            |                  |                 
|Long-range performance shares            |                  | 320             
|Stock options                            |                  | 366             
|Restricted stock                         |                  | 55              
|                                         |                  |                 
|Diluted EPS*                             | $   96,619       | 73,726          



|*Share and per share data have been restated to reflect a 2-for-1 stock split payable June 1, 2005 (see Note 15)                                                                             
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|For the three months and six months ended June 30, 2005 and 2004, the Company had no options or shares of non-vested restricted stock that were excluded from the computation of diluted EPS.



|6. SEGMENT INFORMATION
The Company principally is engaged in two business segments: the purchase, distribution and sale of natural gas in central and north Alabama (natural gas distribution) and the acquisition, development, exploration and production of oil and gas in the continental United States (oil and gas operations).
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                                                                                                                                                                                                                                     
|(in thousands)                                                                                                                                                                                                                                                                                                                       
|Operating revenues from continuing operations                                                                                                                                                                                                                                                                                        
|Oil and gas operations                                                                                                                                                                                                                                                                                                               
|Natural gas distribution                                                                                                                                                                                                                                                                                                             
|Eliminations and other                                                                                                                                                                                                                                                                                                               
|Total                                                                                                                                                                                                                                                                                                                                
|Operating income (loss) from continuing operations                                                                                                                                                                                                                                                                                   
|Oil and gas operations                                                                                                                                                                                                                                                                                                               
|Natural gas distribution                                                                                                                                                                                                                                                                                                             
|Eliminations and corporate expenses                                                                                                                                                                                                                                                                                                  
|Total                                                                                                                                                                                                                                                                                                                                
|Other income (expense)                                                                                                                                                                                                                                                                                                               
|Oil and gas operations                                                                                                                                                                                                                                                                                                               
|Natural gas distribution                                                                                                                                                                                                                                                                                                             
|Eliminations and other                                                                                                                                                                                                                                                                                                               
|Total                                                                                                                                                                                                                                                                                                                                
|Income from continuing operations before income taxes                                                                                                                                                                                                                                                                                



|(in thousands)           | June 30, 2005 | December 31, 2004
|------------------------ | ------------- | -----------------
|Identifiable assets      |               |                  
|Oil and gas operations   | $  1,368,290  | $  1,315,967     
|Natural gas distribution | 820,485       | 837,557          
|Subtotal                 | 2,188,775     | 2,153,524        
|Eliminations and other   | 47,788        | 28,215           
|Total                    | $ 2,236,563   | $  2,181,739     
|                        



|7. COMPREHENSIVE INCOME (LOSS)
Comprehensive income (loss) consisted of the following:                     
|-----------------------------------------------------------------------------------------------------------
|                                                                                                           
|(in thousands)                                                                                             
|                                                                                                           
|Net Income                                                                                                 
|Other comprehensive income (loss)                                                                          
|Current period change in fair value of derivative instruments, net of tax of $4 million and ($10.5) million
|Reclassification adjustment, net of tax of $8.6 million and
   $7.2 million                                
|                                                                                                           
|Comprehensive Income                                                                                       



|                                                                                                                 | Six months ended | Six months ended
|---------------------------------------------------------------------------------------------------------------- | ---------------- | ----------------
|(in thousands)                                                                                                   | June 30, 2005    | June 30, 2004   
|                                                                                                                 |                  |                 
|Net Income                                                                                                       | $  96,619        | $    82,455     
|Other comprehensive income (loss)                                                                                |                  |                 
|Current period change in fair value of derivative instruments, net of tax of ($39.6) million and ($22.7) million | (64,565)         | (38,039)        
|Reclassification adjustment, net of tax of $15.2 million and
   $11.6 million                                    | 24,736           | 18,921          
|                                                                                                                 |                  |                 
|Comprehensive Income                                                                                             | $   56,790       | $     63,337    



|Accumulated other comprehensive loss consisted of the following:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|(in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Unrealized loss on hedges, net of tax of ($40) million and ($15.6) million                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Minimum pension liability, net of tax of ($6.4) million and ($6.4) million                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Accumulated Other Comprehensive Loss                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|8. LONG-LIVED ASSETS AND DISCONTINUED OPERATIONS
The Company applies SFAS No. 144, which retains the previous asset impairment requirements of SFAS No. 121, "Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed Of," for loss recognition when the carrying value of an asset exceeds the sum of the undiscounted estimated future cash flows of the asset. In addition, SFAS No. 144 requires that gains and losses on the sale of certain oil and gas properties and write-downs of certain properties held-for-sale be reported as discontinued operations, with income or loss from operations of the associated properties reported as income or loss from discontinued operations. The results of operations for held-for-sale properties are reclassified and reported as discontinued operations for prior periods in accordance with SFAS No. 144. Energen Resources may, in the ordinary course of business, be involved in the sale of developed or undeveloped properties. All assets held-for-sale must be reported at the lower of the carrying amount or fair value. In the six months ended June 30, 2005, Energen Resources recorded a pre-tax gain of $178,000 primarily from a property sale located in the Permian Basin. Energen Resources had no property sales during the three months ended June 30, 2005 and 2004 or the year-to-date ended June 30, 2004.
The following are the results of operations from discontinued operations:
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|(in thousands, except per share data)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Oil and gas revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Pretax income (loss) from discontinued operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Income tax expense (benefit)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Income (Loss) From Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Gain (loss) on disposal of discontinued operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Income tax expense (benefit)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Gain (Loss) on Disposal of Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total Income (Loss) From Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Diluted Earnings Per Average Common Share*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Income from Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Loss on Disposal of Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total Income from Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Basic Earnings Per Average Common Share*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Income from Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Loss on Disposal of Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total Income from Discontinued Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              



|*Share and per share data have been restated to reflect a 2-for-1 stock split payable June 1, 2005 (see Note 15)9. EMPLOYEE BENEFIT PLANS
|-----------------------------------------------------------------------------------------------------------------------------------------

The components of net pension expense were:

|(in thousands)                           | Plan A                      | Plan B                     
|---------------------------------------- | --------------------------- | ---------------------------
|                                         | Three Months Ended
June 30, | Three Months Ended
June 30,
|                                         | 2005                        | 2004                       
|Components of net periodic benefit cost: |                             |                            
|Service cost                             | $ 1,544                     | $ 1,356                    
|Interest cost                            | 1,886                       | 1,664                      
|Expected long-term return on assets      | (2,199)                     | (1,950)                    
|Actuarial loss                           | 687                         | 433                        
|Prior service cost amortization          | 59                          | 58                         
|Net periodic expense                     | $ 1,977                     | $ 1,561                    



|(in thousands)                                                                                                                                                | Plan A                    | Plan B                   
|------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------- | -------------------------
|                                                                                                                                                              | Six Months Ended
June 30, | Six Months Ended
June 30,
|                                                                                                                                                              | 2005                      | 2004                     
|Components of net periodic benefit cost:                                                                                                                      |                           |                          
|Service cost                                                                                                                                                  | $ 3,089                   | $ 2,712                  
|Interest cost                                                                                                                                                 | 3,772                     | 3,328                    
|Expected long-term return on assets                                                                                                                           | (4,398)                   | (3,900)                  
|Actuarial loss                                                                                                                                                | 1,374                     | 866                      
|Prior service cost amortization                                                                                                                               | 117                       | 116                      
|Net periodic expense                                                                                                                                          | $ 3,954                   | $ 3,122                  
|The Company is not required to make pension contributions in 2005 and does not currently plan to make discretionary contributions to Plan A or Plan B assets.

Net periodic post-retirement benefit expense included the following:

|(in thousands)                           | Salaried Employees          | Union Employees            
|---------------------------------------- | --------------------------- | ---------------------------
|                                         | Three Months Ended
June 30, | Three Months Ended
June 30,
|                                         | 2005                        | 2004                       
|Components of net periodic benefit cost: |                             |                            
|Service cost                             | $ 231                       | $ 320                      
|Interest cost                            | 492                         | 580                        
|Expected long-term return on assets      | (425)                       | (380)                      
|Actuarial gain                           | (32)                        | -                          
|Prior service cost amortization          | -                           | -                          
|Transition amortization                  | 171                         | 171                        
|Net periodic expense                     | $ 437                       | $ 691                      



|(in thousands)                           | Salaried Employees        | Union Employees          
|---------------------------------------- | ------------------------- | -------------------------
|                                         | Six Months Ended
June 30, | Six Months Ended
June 30,
|                                         | 2005                      | 2004                     
|Components of net periodic benefit cost: |                           |                          
|Service cost                             | $ 462                     | $ 640                    
|Interest cost                            | 985                       | 1,160                    
|Expected long-term return on assets      | (851)                     | (760)                    
|Actuarial gain                           | (64)                      | -                        
|Prior service cost amortization          | -                         | -                        
|Transition amortization                  | 341                       | 342                      
|Net periodic expense                     | $ 873                     | $ 1,382                  



|For the three months and six months ended June 30, 2005, the Company made contributions aggregating $1.3 million and $1.5 million, respectively, to the post-retirement plans. The Company expects to make additional discretionary contributions of approximately $1.6 million through the remainder of 2005.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|10. COMMITMENTS AND CONTINGENCIES
Commitments and Agreements: Certain of Alagasco's long-term gas procurement contracts for the supply, storage and delivery of natural gas include fixed charges of approximately $238.8 million through October 2013. Alagasco also is committed to purchase minimum quantities of gas at market-related prices or to pay certain costs in the event the minimum quantities are not taken. These purchase commitments are approximately 105.6 Bcf through December 2014.
Alagasco purchases gas as an agent for certain of its large commercial and industrial customers. Alagasco has in certain instances provided commodity-related guarantees to the counterparties in order to facilitate these agency purchases. Liabilities existing for gas delivered to customers subject to these guarantees are included in the consolidated balance sheet. In the event the customer for whom the guarantee was entered fails to take delivery of the gas, Alagasco can sell such gas for the customer, with the customer liable for any resulting loss. Although the substantial majority of purchases under these guarantees are for the customers' current monthly consumption and are at current market prices, in some instances, the purchases are for an extended term at a fixed price. At June 30, 2005, the fixed price purchases under these guarantees had a maximum term outstanding through March 2006 and an aggregate purchase price of $6 million with a market value of $6.8 million.
Legal Matters: Energen and its affiliates are, from time to time, parties to various pending or threatened legal proceedings. Certain of these lawsuits include claims for punitive damages in addition to other specified relief. Based upon information presently available, and in light of available legal and other defenses, contingent liabilities arising from threatened and pending litigation are not considered material in relation to the respective financial positions of Energen and its affiliates. It should be noted, however, that Energen and its affiliates conduct business in Alabama and other jurisdictions in which the magnitude and frequency of punitive damage awards may bear little or no relation to culpability or actual damages, thus making it increasingly difficult to predict litigation results.
In January 2005, a lawsuit was tried in Cochran County, Texas in which the plaintiff alleged preferential purchase right claims against Energen Resources with respect to certain properties acquired by Energen Resources in 2002. The jury rendered a verdict in Energen Resources' favor on all counts. Subsequently, in March 2005, the Judge issued a decision overruling the jury verdict. Energen Resources is pursuing an appeal of the Judge's order and expects to prevail. Under the Judge's order, Energen Resources potential pre-tax charge to income would be approximately $2 million as of June 30, 2005. This amount includes the net cash flows attributable to the property since its acquisition.
Alagasco is a defendant in a lawsuit filed in Jefferson County, Alabama alleging breach of contract and fraud for compensatory and punitive damages in connection with compressed natural gas vehicle services provided to Alagasco by the plaintiff. Alagasco expects to prevail in its defense of the case. The lawsuit is, however, in the preliminary stages of discovery and, as noted above, it is difficult to predict litigation results. In the event that the plaintiff prevails, Alagasco's preliminary estimate of the damages award ranges from $300,000 to $2,000,000.
Various other pending or threatened legal proceedings arising in the normal course of business are in progress currently, and the Company has accrued a provision for estimated costs.
Environmental Matters: Various environmental laws and regulations apply to the operations of Energen Resources and Alagasco. Historically, the cost of environmental compliance has not materially affected the Company's financial position, results of operationsor cash flowsand is not expected to do so in the future; however, new regulations, enforcement policies, claims for damages or other events could result in significant unanticipated costs.
Environmental compliance costs, including ongoing maintenance, monitoring and similar costs, are expensed as incurred. Environmental remediation costs are accrued when remedial efforts are probable and the cost can be reasonably estimated.
During 2004, the State of New Mexico issued new regulations related to below-grade storage pits. Such pits are used to temporarily hold produced fluids until they can be disposed of permanently. Under the new regulations, the storage pits must be constructed with secondary containment and leak detection, and all such pits will require an annual certification attesting that the storage pits do not leak. As a result of this regulation, the Company expensed $0.9 million as a lease operating expense during the three months and six months ended June 30, 2005. During 2004, the Company capitalized $0.5 million as part of its acquisition of properties in the San Juan Basin and expensed $1.6 million as a lease operating expense under this regulation. The Company does not anticipate any further remediation charges on existing properties related to the new regulations.
Alagasco is in the chain of title of nine former manufactured gas plant sites (four of which it still owns) and five manufactured gas distribution sites (one of which it still owns). An investigation of the sites does not indicate the present need for remediation activities. Management expects that, should remediation of any such sites be required in the future, Alagasco's share, if any, of such costs will not materially affect the financial position, results of operations or cash flows of Alagasco.
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|11. REGULATORY ASSETS AND LIABILITIES
The following table details regulatory assets and liabilities on the balance sheets:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|(in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Regulatory assets:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Pension asset                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total regulatory assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Regulatory liabilities:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Enhanced stability reserve                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Gas supply adjustment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Risk management activities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|RSE adjustment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Unbilled service margin                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Asset removal costs, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Total regulatory liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|12. EQUITY AND DEBT OFFERINGS
In November 2004, Energen issued $100 million of Floating Rate Senior Notes (Senior Notes) due November 15, 2007. The interest rate is the three-month LIBOR Rate plus .35%, reset quarterly. At June 30, 2005, the interest rate was 3.62 percent on the Senior Notes. In January 2005, Alagasco issued $40 million of long-term debt with an interest rate of 5.2 percent due January 15, 2020 and $40 million of long-term debt with an interest rate of 5.7 percent due January 15, 2035. The Senior Note proceeds were used for general corporate purposes and to repay a portion of short-term debt incurred to finance the oil and gas property acquisition program of Energen Resources. Alagasco used long-term debt proceeds to repay amounts drawn on short-term credit facilities for capital expenditures and to refinance $30 million of Medium-Term Notes recalled by Alagasco in April 2004.
In July 2005, Alagasco elected to call a total of $18 million of Medium-Term Notes maturing June 27, 2007 to July 5, 2022. The call date for the above-referenced notes is August 15, 2005.
In June 2005, Energen and Alagasco increased their short-term credit lines available for working capital needs to $300 million. Alagasco has been authorized by the APSC to borrow up to a total of $100 million of these available short-term credit lines.
13. RECENT PRONOUNCEMENTS OF THE FINANCIAL ACCOUNTING STANDARDS BOARD (FASB)
The Company prospectively adopted the fair value recognition provisions of SFAS No. 123 (as amended), which provided methods of transition for a voluntary change to the fair value base method of accounting for stock-based employee compensation, effective January 1, 2003. In December 2004, the FASB issued SFAS No. 123 (revised 2004), "Share-Based Payment," which requires the fair value base method of accounting for all public entities using an option-pricing model that reflects the specific economics of a company's transactions. This statement is effective for the first annual reporting period beginning after June 15, 2005. The Company is currently reviewing the impact of this pronouncement on stock-based compensation.
In December 2004, the FASB issued FSP No. 109-1, "Application of SFAS No. 109, Accounting for Income Taxes, to the provision within the American Jobs Creation Act of 2004 (the Act) that provides a tax deduction on qualified production activities." This Act includes a tax deduction of up to 9 percent (when fully phased-in) of the lesser of (a) qualified production activities income as defined in the Act, or (b) taxable income of the Company determined without regard to this deduction. This tax deduction would apply to qualified production activities of Energen Resources and would be limited to 50 percent of W-2 wages paid by the Company. Pursuant to FSP No. 109-1, the deduction will be reported in the period in which the deduction is claimed on the Company's tax return and will not have an effect on deferred tax assets or deferred tax liabilities. The Company estimates the impact of this tax legislation will reduce income tax expense by approximately $0.9 million during 2005.
During April 2005, the FASB issued FSP No. 19-1, "Accounting for Suspended Well Costs," which allows exploratory wells to be capitalized when the well has a sufficient quantity of reserves to justify its completion as a producing well and the enterprise is making sufficient progress assessing the reserves and the economic and operating viability of the project.This interpretation is effective for the first reporting period beginning after April 4, 2005. The impact of this position on the Company is expected to be immaterial.
In March 2005, the FASB issued FIN No. 47, "Accounting for Conditional Asset Retirement Obligations", which refers to a legal obligation to perform an asset retirement activity in which the timing and (or) method of settlement are conditional on a future event that may or may not be within the control of the entity. This interpretation is effective no later than the end of fiscal years ending after December 15, 2005. The Company does not anticipate this interpretation to have an impact on the Company.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            



|14. ACQUISITION OF OIL AND GAS PROPERTIES
On August 2, 2004, Energen Resources completed a purchase of San Juan Basin coalbed methane properties from a private company for approximately $273 million. The effective date of the acquisition was August 1, 2004. Energen Resources acquired an estimated 245 Bcfe of proved natural gas and natural gas liquids reserves. Approximately 51 percent of the proved reserves were estimated to be behind pipe and undeveloped. The Company estimates approximately 80 percent of the acquisition reserves are gas with natural gas liquids comprising the balance. Energen used its short-term credit facilities and internally generated cash flows to finance the acquisition. A portion of the short-term debt incurred to finance the acquisition was repaid when Energen issued $100 million of Floating Rate Senior Notes in November 2004.
Summarized below are the consolidated results of operations for the three months and six months ended June 30, 2004, on an unaudited pro forma basis as if the purchase of assets had occurred at the beginning of the period presented. The pro forma information is based on the Company's consolidated results of operations for the three months and six months ended June 30, 2004, and on the data provided by the seller. The pro forma financial information does not purport to be indicative of results of operations that would have occurred had the transaction occurred on the basis assumed above, nor are they indicative of results of the future operations of the combined enterprises.
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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Three months ended | Six months ended
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|(in thousands, except per share data)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | June 30, 2004      | June 30, 2004   
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                    |                 
|Operating revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | $ 193,357          | $ 549,930       
|Income from continuing operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | $ 22,575           | $ 83,081        
|Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | $ 22,614           | $ 83,144        
|Diluted earnings per average common share*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | $ 0.31             | $ 1.14          
|Basic earnings per average common share*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | $ 0.31             | $ 1.15          
|*Share and per share data have been restated to reflect a 2-for-1 stock split payable June 1, 2005 (see Note 15)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|15. STOCK DIVIDEND
On April 27, 2005, Energen's shareholders approved a 2-for-1 split of the Company's common stock. The split was effected in the form of a 100 percent stock dividend and was payable on June 1, 2005, to shareholders of record on May 13, 2005. All share and per share amounts of capital stock outstanding have been adjusted to reflect the stock split. Effective April 29, 2005, the Restated Certificate of Incorporation of Energen Corporation was amended to increase the Company's authorized common stock, par value $0.01 per share, from 75,000,000 shares to 150,000,000 shares.











|ITEM 2.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Energen's net income totaled $37.6 million ($0.51 per diluted share) for the three months ended June 30, 2005 and compared favorably with net income of $22.3 million ($0.30 per diluted share) for the same period in the prior year.
Loss from discontinued operations was $15,000 in the current quarter as compared with income of $39,000 in the prior-year second quarter. Energen Resources Corporation, Energen's oil and gas subsidiary, had net income and net income from continuing operations for the three months ended June 30, 2005, of $36.4 million compared with $21.8 million in the same quarter in the previous year. Significantly higher commodity prices (approximately $19 million after-tax) and increased production volumes (approximately $5 million after-tax) were partially offset by increased lease operating expenses (approximately $4 million after-tax), higher production taxes (approximately $2 million after-tax) and increased depreciation, depletion and amortization (DD&A) expense (approximately $2 million after-tax). Energen's natural gas utility, Alagasco, reported net income of $1.1 million in the second quarter of 2005 and compared favorably to net income of $0.6 million in the same period last year primarily reflecting the timing of revenue recovery between quarters under the utility's rate setting mechanism.
For the 2005 year-to-date, Energen's net income totaled $96.6 million ($1.31 per diluted share) and compared favorably to net income of $82.5 million ($1.13 per diluted share) for the same period in the prior year. Income from discontinued operations totaled $90,000 and $63,000 in the current- and prior-year periods, respectively. Energen Resources had net income for the six months ended June 30, 2005, of $56 million as compared with $45 million in the previous period. Energen Resources generated income from continuing operations of $55.9 million in the current year-to-date as compared with $45 million in the same period last year primarily as a result of higher commodity prices (approximately $21 million after-tax) and increased production volumes (approximately $7 million after-tax) partially offset by the impact of increased lease operating expenses (approximately $7 million after-tax), higher production taxes (approximately $3 million after-tax), increased DD&A expense (approximately $3 million after-tax) and increased administrative expenses (approximately $3 million after-tax). Alagasco's net income of $40.1 million in the current year-to-date increased from net income of $36.9 million in the same period in the previous year primarily reflecting the utility's ability to earn on a higher level of equity and the timing of revenue recovery under the utility's rate setting mechanism.
Oil and Gas Operations
Revenues from oil and gas operations rose 41.1 percent to $134.5 million for the three months ended June 30, 2005, and 24 percent to $237.3 million in the year-to-date largely as a result of increased commodity prices as well as the impact of higher gas and natural gas liquids production volumes. During the current quarter, average gas prices rose 30.7 percent to $6.22 per thousand cubic feet (Mcf), while average oil prices increased 26.8 percent to $33.63 per barrel. Natural gas liquids prices increased 23.8 percent to an average price of $0.52 per gallon. In the year-to-date, average gas prices increased 13.9 percent to $5.43 Mcf, average oil prices rose 22.6 percent to $32.89 per barrel and natural gas liquids prices increased 26.8 percent to $0.52 per gallon. The average sales prices reflected the impact of open and closed derivative instruments including a $2.7 million after-tax gain in the current quarter and a $4.3 million after-tax loss year-to-date from the effects of open gas derivative contracts marked-to-market. These gas contracts did not meet the definition of cash flow hedges, as more fully described below. For the three months ended June 30, 2005, the Company also included in the average gas and oil sales prices a $0.2 million after-tax loss for the quarter and a $1 million after-tax loss year-to-date on open contracts for the ineffective portion of the change in fair value of derivatives accounted for as cash flow hedges.
Production increased primarily due to volumes related to the purchase of San Juan Basin coalbed methane properties and increased drilling of wells in North Louisiana. Energen Resources acquired an estimated 245 Bcfe of proved natural gas and natural gas liquids reserves in the San Juan Basin effective August 1, 2004. Negatively affecting production was a normal production decline that was in excess of new production coming on-line in the Permian Basin. Natural gas production from continuing operations in the second quarter rose 10.5 percent to 15.2 billion cubic feet (Bcf), oil volumes increased 2 percent to 848 thousand barrels (MBbl) and natural gas liquids production increased 10.1 percent to 18.6 million gallons (MMgal). For the year-to-date, natural gas production increased 8.8 percent to 29.9 Bcf while oil production decreased 2.2 percent to 1.7 MBbl. Natural gas liquids production rose 6.8 percent to 34.4 MMgal. Natural gas comprised approximately 65 percent of Energen Resources' production for the current quarter and the year-to-date.
Energen Resources periodically enters into derivative commodity instruments that qualify as cash flow hedges under Statement of Financial Accounting Standard (SFAS) No. 133, "Accounting for Derivative Instruments and Hedging Activities," to hedge its exposure to price fluctuations on oil, natural gas and natural gas liquids production. Such instruments may include regulated natural gas and crude oil futures contracts traded on the New York Mercantile Exchange (NYMEX) and over-the-counter swaps, collars and basis hedges with major energy derivative product specialists. These hedge transactions are pursuant to standing authorizations by the Board of Directors, which do not permit speculative positions.
Energen Resources applies SFAS No. 133 which requires all derivatives to be recognized on the balance sheet and measured at fair value. If a derivative is designated as a cash flow hedge, the effectiveness of the hedge, or the degree that the gain (loss) for the hedging instrument offsets the loss (gain) on the hedged item is measured at each reporting period. The effective portion of the gain or loss on the derivative instrument is recognized in other comprehensive income (OCI) as a component of equity and subsequently reclassified into earnings as operating revenues when the forecasted transaction affects earnings. The ineffective portion of a derivative's change in fair value is required to be recognized in earnings immediately. Derivatives that do not qualify for hedge treatment under SFAS No. 133 must be recorded at fair value with gains or losses recognized in operating revenues in the period of change. Energen Resources recorded an after-tax loss of $0.8 million for the three months ended June 30, 2005, and a $2 million after-tax loss year-to-date on open and closed contracts that did not meet the definition of cash flow hedges under SFAS No. 133. For the three months ended June 30, 2005, the Company recorded a $4 million after-tax gain for the quarter and a $5.7 million after-tax loss year-to-date on open and closed contracts for the ineffective portion of the change in fair value of derivatives accounted for as cash flow hedges.



|Energen Resources has entered into the following transactions for the remainder of 2005 and subsequent years:
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|Production Period                                                                                            
|Natural Gas                                                                                                  
|2005                                                                                                         
|                                                                                                             
|2006                                                                                                         
|                                                                                                             
|Natural Gas Basis Differential                                                                               
|2005                                                                                                         
|Oil                                                                                                          
|2005                                                                                                         
|                                                                                                             
|2006                                                                                                         
|Oil Basis Differential                                                                                       
|2005                                                                                                         
|2006                                                                                                         
|Natural Gas Liquids                                                                                          
|2005                                                                                                         
|2006                                                                                                         
|* Average contract prices are not meaningful due to the varying nature of each contract.                     



|Realized prices are anticipated to be lower than NYMEX prices due to basis differences and other factors.
Operations and maintenance (O&M) expense increased $8.6 million for the quarter and $16.5 million in the year-to-date. Lease operating expenses (excluding production taxes) increased by $6.9 million for the quarter and $11.9 million year-to-date primarily due to increased workover and maintenance expenses, increased ad valorem taxes, environmental compliance costs and overall price increases related to higher commodity prices. Administrative expense rose $1.6 million for the three months ended June 30, 2005 and $4.2 million in the year-to-date, primarily due to labor related costs. Exploration expense was higher by $0.1 million in the second quarter and by $0.4 million in year-to-date comparisons.
Energen Resources' DD&A expense for the quarter increased $3.4 million and rose $5.4 million year-to-date. The average depletion rate for the current quarter was $0.96 per mcfe as compared to $0.88 per mcfe in the same period a year ago. For the six months ended June 30, 2005, the average depletion rate was $0.95 per mcfe as compared to $0.88 per mcfe in the previous period. The increases in depletion rates were largely due to a higher depreciation rate on coalbed methane properties purchased in the prior year.
Energen Resources' expense for taxes other than income taxes primarily reflected production-related taxes that were $3.4 million higher this quarter and $5.4 million higher year-to-date largely due to increased commodity market prices and increased production related to the prior year San Juan Basin acquisition.
Energen Resources may, in the ordinary course of business, be involved in the sale of developed or undeveloped properties. With respect to developed properties, sales may occur as a result of, but not limited to, disposing of non-strategic or marginal assets and accepting offers where the buyer gives greater value to a property than does Energen Resources. The Company is required to reflect gains and losses on the dispositions of these assets, the write-down of certain properties held-for-sale, and income or loss from the operations of the associated held-for-sale properties as discontinued operations under the provisions of SFAS No. 144, "Accounting for Impairment or Disposal of Long-Lived Assets." In the current year-to-date, Energen Resources recorded a pre-tax gain of $178,000 primarily from a property sale located in the Permian Basin. Energen Resources had no property sales during the three months ended June 30, 2005 and 2004 or the year-to-date ended June 30, 2004.
Natural Gas Distribution
Natural gas distribution revenues increased $14.5 million for the quarter largely due to an increase in the commodity cost of gas and an increase in weather related sales volumes. Weather that was 27.8 percent colder than in the same period last year contributed to a 10.9 percent increase in residential sales volumes while small commercial and industrial customer sales volumes increased 8.3 percent. Transportation volumes decreased 9.4 percent in period comparisons. Revenues for the year-to-date rose $17.4 million primarily due to an increase in commodity gas costs partially offset by a decrease in weather related usage. Weather that was 7.8 percent warmer than in the previous period contributed to an 8.9 percent decline in residential sales volumes and a 6.9 percent decrease in small commercial and industrial customer sales volumes. Large transportation volumes declined 7.6 percent. Higher gas costs along with increased gas purchase volumes resulted in a 25.2 percent increase in cost of gas for the quarter. For the year-to-date, an increase in cost of gas of 4.7 percent was largely due to significantly higher gas costs partially offset by decreased gas purchase volumes. Utility gas costs include commodity cost, risk management gains and losses and the provisions of the GSA rider. The GSA rider in Alagasco's rate schedule provides for a pass-through of gas price fluctuations to customers without markup. Alagasco's tariff provides a temperature adjustment to certain customers' bills designed to substantially remove the effect of departures from normal temperatures. The temperature adjustment applies primarily to residential, small commercial and small industrial customers.
As discussed more fully in Note 3, Alagasco is subject to regulation by the Alabama Public Service Commission (APSC). On June 10, 2002, the APSC issued an order to extend Alagasco's rate-setting mechanism. Under the terms of that extension, RSE will continue after January 1, 2008, unless, after notice to Alagasco and a hearing, the Commission votes to either modify or discontinue its operation.
O&M expense increased 6.6 percent in the current quarter and 2.1 percent in the six months ended June 30, 2005, primarily due to increased labor-related expense partially offset by reduced bad debt expense and insurance costs. An 8 percent increase in depreciation expense in the current quarter and an 8.2 percent increase in the year-to-date was due to normal replacement of the utility's distribution and support systems. Taxes other than income taxes primarily reflected various state and local business taxes as well as payroll-related taxes. State and local business taxes generally are based on gross receipts and fluctuate accordingly.
Non-Operating Items
Interest expense for the Company increased $0.8 million in the second quarter and $2.2 million year-to-date primarily due to the issuance of $100 million of Floating Rate Senior Notes by Energen in November 2004 as well as Alagasco's issuance of $40 million of long-term debt with an interest rate of 5.2 percent and $40 million of long-term debt with an interest rate of 5.7 percent in January 2005. In the year-to-date comparison, these increases were partially offset by interest on $30 million of Medium-Term Notes that were called in April 2004 by Alagasco. In the current quarter, income tax expense for the Company increased $8.8 million and was $8.1 million higher in year-to-date comparisons largely due to higher consolidated pre-tax income. Alagasco's income tax expense increased $1.1 million in the current quarter and $2.7 million in the year-to-date primarily due to higher pre-tax income and increased taxes in the current quarter related to utility depreciable plant of $0.4 million after-tax.
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|FINANCIAL POSITION AND LIQUIDITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Cash flows from operations for the year-to-date were $253.3 million as compared to $212.2 million. Operating cash flow benefited from higher realized commodity prices and production volumes at Energen Resources. The Company's working capital needs were also impacted by current liabilities associated with Energen Resources' hedge position and other changes in working capital items, which are highly influenced by throughput, changes in weather, and timing of payments. Working capital needs at Alagasco were primarily affected by increased gas costs compared to the prior period.
The Company had a net outflow of cash from investing activities of $112.6 million for the six months ended June 30, 2005 primarily due to additions of property, plant and equipment. Energen Resources invested $88.5 million in capital expenditures primarily related to the development of oil and gas properties. Utility capital expenditures totaled $35.5 million in the year-to-date and primarily represented system distribution expansion and support facilities.
The Company used $69.8 million for financing activities in the year-to-date primarily due to the repayment of short-term borrowings and dividends paid to common stockholders. Also influencing financing activities were the proceeds from the issuance of $80 million of long-term debt by Alagasco in January 2005.



|FUTURE CAPITAL RESOURCES AND LIQUIDITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|The Company plans to continue to implement its diversified growth strategy that focuses on expanding Energen Resources' oil and gas operations through the acquisition of producing properties with developmental potential while maintaining the strength of the Company's utility foundation. For the five years ended December 31, 2004, Energen's diluted EPS grew at an average compound rate of 17.5 percent a year. Over the next five years, Energen is targeting an average diluted EPS growth rate over each rolling five-year period of approximately 7 to 8 percent a year.
On April 27, 2005, Energen's shareholders approved a 2-for-1 split of the Company's common stock. The split was effected in the form of a 100 percent stock dividend and was payable on June 1, 2005, to shareholders of record on May 13, 2005. All share and per share amounts of capital stock outstanding have been adjusted to reflect the stock split.
Energen Resources' capital investment for oil and gas activities over a five-year planning period ending December 31, 2009, is estimated to be approximately $1.5 billion, with $1.2 billion for property acquisitions and related development, $253 million for other development and $25 million for exploratory and other activities. To finance Energen Resources' investment program, the Company expects primarily to utilize short-term credit facilities to supplement internally generated cash flow. The Company may also periodically issue long-term debt and equity to replace short-term obligations, enhance liquidity and provide for permanent financing. Energen has available short-term credit facilities aggregating $300 million to help finance its growth plans and operating needs. As more fully discussed above, the Company issued $100 million of long-term debt in November 2004. These proceeds were used for general corporate purposes and to repay a portion of short-term debt incurred to finance the oil and gas property acquisition program of Energen Resources.
In 2005, Energen Resources plans to invest approximately $364 million in capital expenditures, including $200 million in property acquisitions, $7 million in related acquisition development and $157 million in other development and exploratory activities. As of December 31, 2004, the estimated amount of development of previously identified proved undeveloped reserves was approximately $84 million. Capital investment at Energen Resources in 2006 is expected to approximate $215 million for property acquisitions, $29 million for related acquisition development and $57 million for other development and exploration. Of this $57 million, development of previously identified proved undeveloped reserves is estimated to be $30 million and exploratory exposure is estimated to be $3 million.
Energen Resources currently expects production to approximate 94 Bcfe and 98 Bcfe for 2005 and 2006, respectively. The Company's most recent estimate of production attributable to already owned proved reserves was prepared as of December 31, 2004. Production from proved reserves owned as of December 31, 2004, was estimated as 91 Bcfe and 88 Bcfe for 2005 and 2006, respectively.
Energen Resources' continued ability to invest in property acquisitions will be influenced significantly by industry trends, as the producing property acquisition market historically has been cyclical. Notwithstanding the estimated expenditures mentioned above, as an acquisition oriented company, Energen Resources continually evaluates acquisition opportunities which arise in the marketplace and from time to time may pursue acquisitions that meet Energen's acquisition criteria which could result in capital expenditures different than those outlined above. These acquisitions or negotiations to sell, trade or otherwise dispose of properties may alter the aforementioned financing requirements.
Alagasco maintains an investment in storage gas that is expected to average approximately $56 million in 2005 but may vary depending upon the price of natural gas. During 2005 and 2006, Alagasco plans to invest approximately $61 million and $57 million, respectively, in utility capital expenditures for normal distribution and support systems. Over the Company's five-year planning period ending December 31, 2009, Alagasco anticipates capital investments of approximately $295 million. The utility anticipates funding these capital requirements through internally generated capital and the utilization of short-term credit facilities. In January 2005, Alagasco issued $80 million in long-term debt to repay amounts drawn on short-term credit facilities for capital expenditures and to refinance the $30 million in Medium-Term Notes recalled by Alagasco in April 2004. In July 2005, Alagasco elected to call a total of $18 million of Medium-Term Notes maturing June 27, 2007 to July 5, 2022. The call date for the above-referenced notes is August 15, 2005.
Energen Resources periodically enters into derivative commodity instruments that qualify as cash flow hedges under SFAS No. 133 to hedge its exposure to price fluctuations on oil, natural gas and natural gas liquids production. In addition, Alagasco periodically enters into cash flow derivative commodity instruments to hedge its exposure to price fluctuations on its gas supply. Such instruments may include regulated natural gas and crude oil futures contracts traded on the New York Mercantile Exchange (NYMEX) and over-the-counter swaps, collars and basis hedges with major energy derivative product specialists. The counterparties to the commodity instruments are investment banks and energy-trading firms. In some contracts, the amount of credit allowed before collateral must be posted for out-of-the-money hedges varies depending on the credit rating of the Company or Alagasco. In cases where this arrangement exists, generally the credit ratings must be maintained at investment grade status to have available counterparty credit.
Access to capital is an integral part of the Company's business plan. The Company regularly provides information to corporate rating agencies related to current business activities and future performance expectations. In June 2005, Standard & Poor's (S&P) lowered its corporate credit rating on Energen and Alagasco to BBB+ with a stable outlook from A- with a negative outlook. While the Company expects to have ongoing access to its short-term credit facilities and the broader long-term markets, continued access could be adversely affected by future economic and business conditions and credit rating downgrades.
Contractual Cash Obligations and Other Commitments
In the course of ordinary business activities, Energen enters into a variety of contractual cash obligations and other commitments. The following table summarizes the Company's significant contractual cash obligations, other than hedging contracts as of June 30, 2005.



|                                   |             | Payments Due before December 31,
|---------------------------------- | ----------- | --------------------------------
|(in thousands)                     | Total       | 2005                            
|                                   |             |                                 
|                                   |             |                                 
|Short-term debt                    | $ -         | $ -                             
|Long-term debt (1)                 | 624,415     | 10,000                          
|Interest payments on debt (2)      | 506,267     | 19,995                          
|Purchase obligations (3)           | 238,860     | 24,849                          
|Capital lease obligations          | -           | -                               
|Operating leases                   | 51,024      | 1,933                           
|                                   |             |                                 
|Total contractual cash obligations | $ 1,420,566 | $ 56,777                        
|                                   |             |                                 



|(1) Long-term cash obligations include $1.5 million of unamortized debt discounts as of June 30, 2005.
(2) Includes interest on fixed rate debt and an estimate of adjustable rate debt. The adjustable rate interest is calculated based on the indexed rate in effect at June 30, 2005.
(3) Certain of the Company's long-term gas procurement contracts for the supply, storage and delivery of natural gas include fixed charges of approximately $238.8 million through October 2013. The Company also is committed to purchase minimum quantities of gas at market-related prices or to pay certain costs in the event the minimum quantities are not taken. These purchase commitments are approximately 105.6 Bcf through December 2014.
Energen Resources operates in certain instances through joint ventures under joint operating agreements. Typically, the operator under a joint operating agreement enters into contracts, such as drilling contracts, for the benefit of all joint venture partners. Through the joint operating agreement, the non-operators reimburse, and in some cases advance, the funds necessary to meet the contractual obligations entered into by the operator. These obligations are typically shared on a working interest basis as defined in the joint operating contractual agreement.
The Company has two defined non-contributory pension plans and provides certain post-retirement healthcare and life insurance benefits. The Company is not required to make any funding payments during 2005 for the pension plans and does not currently plan to make discretionary contributions. The Company expects to make discretionary payments of $1.6 million to post-retirement benefit program assets during the remainder of 2005.
Recent Pronouncements of the Financial Accounting Standards Board (FASB)
The Company prospectively adopted the fair value recognition provisions of SFAS No. 123 (as amended), which provided methods of transition for a voluntary change to the fair value base method of accounting for stock-based employee compensation, effective January 1, 2003. In December 2004, the FASB issued SFAS No. 123 (revised 2004), "Share-Based Payment," which requires the fair value base method of accounting for all public entities using an option-pricing model that reflects the specific economics of a company's transactions. This statement is effective for the first annual reporting period beginning after June 15, 2005. The Company is currently reviewing the impact of this pronouncement on stock-based compensation.
In December 2004, the FASB issued FSP No. 109-1, "Application of SFAS No. 109, Accounting for Income Taxes, to the provision within the American Jobs Creation Act of 2004 (the Act) that provides a tax deduction on qualified production activities." This Act includes a tax deduction of up to 9 percent (when fully phased-in) of the lesser of (a) qualified production activities income as defined in the Act, or (b) taxable income of the Company determined without regard to this deduction. This tax deduction would apply to qualified production activities of Energen Resources and would be limited to 50 percent of W-2 wages paid by the Company. Pursuant to FSP No. 109-1, the deduction will be reported in the period in which the deduction is claimed on the Company's tax return and will not have an effect on deferred tax assets or deferred tax liabilities. The Company estimates the impact of this tax legislation will reduce income tax expense by approximately $0.9 million during 2005.
During April 2005, the FASB issued FSP No. 19-1, "Accounting for Suspended Well Costs," which allows exploratory wells to be capitalized when the well has a sufficient quantity of reserves to justify its completion as a producing well and the enterprise is making sufficient progress assessing the reserves and the economic and operating viability of the project.This interpretation is effective for the first reporting period beginning after April 4, 2005. The impact of this position on the Company is expected to be immaterial.
In March 2005, the FASB issued FIN No. 47, "Accounting for Conditional Asset Retirement Obligations", which refers to a legal obligation to perform an asset retirement activity in which the timing and (or) method of settlement are conditional on a future event that may or may not be within the control of the entity. This interpretation is effective no later than the end of fiscal years ending after December 15, 2005. The Company does not anticipate this interpretation to have an impact on the Company.
Forward-Looking Statements and Risk Factors
Certain statements in this report express expectations of future plans, objectives and performance of the Company and its subsidiaries and constitute forward-looking statements made pursuant to the Safe Harbor provision of the Private Securities Litigation Reform Act of 1995. Except as otherwise disclosed, the forward-looking statements do not reflect the impact of possible or pending acquisitions, divestitures or restructurings. The absence of errors in input data, calculations and formulas used in estimates, assumptions and forecasts cannot be guaranteed. Neither the Company nor Alagasco undertakes any obligation to correct or update any forward-looking statements whether as a result of new information, future events or otherwise.
All statements based on future expectations rather than on historical facts are forward-looking statements that are dependent on certain events, risks and uncertainties that could cause actual results to differ materially from those anticipated. Some of these include, but are not limited to, economic and competitive conditions, inflation rates, legislative and regulatory changes, financial market conditions, our ability to access the capital markets, future business decisions, utility customer growth and retention and usage per customer, litigation results and other uncertainties, all of which are difficult to predict.
There are numerous uncertainties inherent in estimating quantities of proved oil and gas reserves and in projecting future rates of production and timing of development expenditures. The total amount or timing of actual future production may vary significantly from reserve and production estimates. In the event Energen Resources is unable to fully invest its planned acquisition, development and exploratory expenditures, future operating revenues, production, and proved reserves could be negatively affected. The drilling of development and exploratory wells can involve significant risks, including those related to timing, success rates and cost overruns, and these risks can be affected by lease and rig availability, complex geology and other factors.
Although Energen Resources makes use of futures, swaps and fixed-price contracts to mitigate price risk, fluctuations in future oil and gas prices could materially affect the Company's financial position and results of operations and cash flows; furthermore, such risk mitigation activities may cause the Company's financial position and results of operations to be materially different from results that would have been obtained had such risk mitigation activities not occurred. The effectiveness of such risk-mitigation assumes that counterparties maintain satisfactory credit quality. The effectiveness of such risk mitigation also assumes that actual sales volumes will generally meet or exceed the volumes subject to the futures, swaps and fixed price contracts. A substantial failure to meet sales volume targets, whether caused by miscalculations, weather events, natural disaster, accident, criminal act or otherwise, could leave Energen Resources financially exposed to its counterparties and result in material adverse financial consequences to Energen Resources and the Company. The adverse effect could be increased if the adverse event was widespread enough to move market prices against Energen Resources' position.
Similarly, although Alagasco makes use of futures, swaps and fixed-price contracts to mitigate gas supply cost risk, fluctuations in future gas supply costs could materially affect its financial position and rates to customers. The effectiveness of Alagasco's risk mitigation assumes that its counterparties in such activities maintain satisfactory credit quality. The effectiveness of such risk mitigation also assumes that Alagasco's actual gas supply needs will generally meet or exceed the volumes subject to the futures, swaps and fixed price contracts. A substantial failure to experience projected gas supply needs, whether caused by miscalculations, weather events, natural disaster, accident, criminal act or otherwise, could leave Alagasco financially exposed to its counterparties and result in
material adverse financial consequences to Alagasco and the Company. The adverse effect could be increased if the adverse event was widespread enough to move market prices against Alagasco's position.
Inherent in gas distribution activities are a variety of hazards and operation risks, such as leaks, explosions and mechanical problems that could cause substantial financial losses. In addition, these risks could result in loss of human life, significant damage to property, environmental pollution, impairment of our operations and substantial losses to the Company. In accordance with customary industry practices we maintain insurance against some, but not all, of these risks and losses. The location of pipeline and storage facilities near populated areas, including residential areas, commercial business centers and industrial sites, could increase the level of damages resulting from these risks. The occurrence of any of these events could adversely affect Alagasco's and the Company's financial position, results of operations and cash flows. Our utility customers are geographically concentrated in central and north Alabama. Significant economic, weather or other events that adversely affect this region could adversely affect Alagasco and the Company.
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|SELECTED BUSINESS SEGMENT DATA                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|ENERGEN CORPORATION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|(Unaudited)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|(in thousands, except sales price data)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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|Oil and Gas Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Operating revenues from continuing operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Natural gas                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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|Natural gas liquids                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Production volumes from continuing operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Natural gas (MMcf)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Oil (MBbl)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Natural gas liquids (MMgal)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Production volumes from continuing operations (MMcfe)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Total production volumes (MMcfe)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Average sales price including effects of derivative instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Natural gas (Mcf)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Oil (barrel)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Natural gas liquids (gallon)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Average sales price excluding effects of derivative contracts marked-to-market and open ineffectiveness                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Natural gas (Mcf)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Oil (barrel)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Natural gas liquids (gallon)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Average sales price excluding effects of derivative instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Natural gas (Mcf)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Oil (barrel)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Gas delivery volumes (MMcf)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Residential                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Commercial and industrial - small                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Transportation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Other data                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Depreciation and amortization                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Capital expenditures                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Operating income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        



|ITEM 3. 	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Energen Resources' major market risk exposure is in the pricing applicable to its oil and gas production. Historically, prices received for oil and gas production have been volatile because of seasonal weather patterns, world and national supply-and-demand factors and general economic conditions. Crude oil prices also are affected by quality differentials, by worldwide political developments and by actions of the Organization of Petroleum Exporting Countries. Basis differentials, like the underlying commodity prices, can be volatile because of regional supply-and-demand factors, including seasonal factors and the availability and price of transportation to consuming areas.
Energen Resources periodically enters into derivative commodity instruments that qualify as cash flow hedges under Statement of Financial Accounting Standard (SFAS) No. 133, "Accounting for Derivative Instruments and Hedging Activities," to hedge its exposure to price fluctuations on oil, natural gas and natural gas liquids production. In addition, Alagasco periodically enters into cash flow derivative commodity instruments to hedge its gas supply exposure. Such instruments may include regulated natural gas and crude oil futures contracts traded on the New York Mercantile Exchange (NYMEX) and over-the-counter swaps, collars and basis hedges with major energy derivative product specialists. The counterparties to the commodity instruments are investment banks and energy-trading firms. These counterparties have been deemed creditworthy by the Company and have agreed in certain instances to post collateral with the Company when unrealized gains on hedges exceed certain specified contractual amounts. Notwithstanding these agreements, the Company is at risk for economic loss based upon the creditworthiness of its counterparties. In some contracts, the amount of credit allowed before Energen Resources and Alagasco must post collateral for out-of-the-money hedges varies depending on the credit rating of the Company or Alagasco. All hedge transactions are subject to the Company's risk management policy, approved by the Board of Directors, which does not permit speculative positions. The Company formally documents all relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking the hedge. The maximum term over which Energen Resources has hedged exposures to the variability of cash flows is through December 31, 2006.
See Note 4 for details related to the Company's hedging activities.
The Company's interest rate exposure as of June 30, 2005 was minimal since approximately 85 percent of long-term debt obligations were at fixed rates.







|ITEM 4. CONTROLS AND PROCEDURES
|-------------------------------
|                               
|                               
|(a)                            
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|(b)                            
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|PART II. OTHER INFORMATION                                                                                                                                                                                                                                        
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                  
|                                                                                                                                                                                                                                                                  
|ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS*                                                                                                                                                                                              
|                                                                                                                                                                                                                                                                  
|Period                                                                                                                                                                                                                                                            
|                                                                                                                                                                                                                                                                  
|April 1, 2005 through April 30, 2005                                                                                                                                                                                                                              
|May 1, 2005 through May 31, 2005                                                                                                                                                                                                                                  
|June 1, 2005 through June 30, 2005                                                                                                                                                                                                                                
|Total                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                  
|* Share and per share data have been restated to reflect a 2-for-1 stock split payable June 1, 2005 (see Note 15).                                                                                                                                                
|** Acquired in connection with tax withholdings and payment of exercise price on stock compensation plans.                                                                                                                                                        
|*** By resolution adopted May 24, 1994, and supplemented by a resolution adopted April 26, 2000, the Board of Directors authorized the Company to repurchase up to 3,564,400 shares of the Company's common stock. The resolutions do not have an expiration date.
|                                                                                                                                                                                                                                                                  
|ITEM 6. EXHIBITS                                                                                                                                                                                                                                                  
|                                                                                                                                                                                                                                                                  
|31(a) - Section 302 Certificate required by Rule 13a-14(a) or Rule 15d-14(a)
31(b) - Section 302 Certificate required by Rule 13a-14(a) or Rule 15d-14(a)
32 - Section 906 Certificate pursuant to 18 U.S.C. Section 1350                                         
|SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.                                                          





|               |  | ENERGEN CORPORATION                                                    
|-------------- |  | -----------------------------------------------------------------------
|               |  | ALABAMA GAS CORPORATION                                                
|               |  |                                                                        
|August 8, 2005 |  | By/s/ Wm. Michael Warren, Jr.                                          
|               |  | Wm. Michael Warren, Jr.                                                
|               |  | Chairman, President and Chief Executive                                
|               |  | Officer of Energen Corporation, Chairman and Chief Executive Officer of
|               |  | Alabama Gas Corporation                                                
|               |  |                                                                        
|               |  |                                                                        
|               |  |                                                                        
|August 8, 2005 |  | By/s/ G. C. Ketcham                                                    
|               |  | G. C. Ketcham                                                          
|               |  | Executive Vice President, Chief                                        
|               |  | Financial Officer and Treasurer of                                     
|               |  | Energen Corporation and Alabama Gas                                    
|               |  | Corporation                                                            
|               |  |                                                                        
|               |  |                                                                        
|August 8, 2005 |  | By/s/ Grace B. Carr                                                    
|               |  | Grace B. Carr                                                          
|               |  | Vice President and Controller of Energen                               
|               |  | Corporation                                                            
|               |  |                                                                        
|               |  |                                                                        
|August 8, 2005 |  | By/s/ Paula H. Rushing                                                 
|               |  | Paula H. Rushing                                                       
|               |  | Vice President-Finance of Alabama Gas                                  
|               |  | Corporation                                                            
|               |  |                                                                        
|               |  |                                                                        
|               |  |