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| Designation                                      | Dated as of                 |
|--------------------------------------------------|-----------------------------|
| First      Supplemental Indenture                | March      1, 1949          |
| Second      Supplemental Indenture               | July      1, 1951           |
| Third      Supplemental Indenture                | March      1, 1957          |
| Fourth      Supplemental Indenture               | January      1, 1968        |
| Fifth      Supplemental Indenture                | April      1, 1971          |
| Sixth      Supplemental Indenture                | August      1, 1975         |
| Seventh      Supplemental Indenture              | September      1, 1976      |
| Eighth      Supplemental Indenture               | September      1, 1977      |
| Ninth      Supplemental Indenture                | April      1, 1978          |
| Tenth      Supplemental Indenture                | August      1, 1978         |
| Eleventh      Supplemental Indenture             | December      1, 1982       |
| Twelfth      Supplemental Indenture              | April      1, 1987          |
| Thirteenth      Supplemental Indenture           | March      1, 1992          |
| Fourteenth      Supplemental Indenture           | June      1, 1992           |
| Fifteenth      Supplemental Indenture            | July      1, 1992           |
| Sixteenth      Supplemental Indenture            | July      1, 1992           |
| Seventeenth      Supplemental Indenture          | February      1, 1993       |
| Eighteenth      Supplemental Indenture           | July      1, 1993           |
| Nineteenth      Supplemental Indenture           | February      1, 1997       |
| Twentieth      Supplemental Indenture            | November      1, 1997       |
| Twenty-first      Supplemental Indenture         | October      1, 2000        |
| Twenty-second      Supplemental Indenture        | July      1, 2003           |
| Twenty-third      Supplemental Indenture         | August      1, 2004         |
| Twenty-fourth      Supplemental Indenture        | March      1, 2005          |
| Twenty-fifth      Supplemental Indenture         | December      1, 2005       |
|  Twenty-sixth      Supplemental Indenture   |  October      1, 2006  |
|  Twenty-seventh      Supplemental Indenture |  February      1, 2008 |

| Series                                         | PrincipalAmount  Issued | PrincipalAmountOutstanding |
|------------------------------------------------|-----------------------------------|----------------------------|
| 3-1/8%      Series due 1975                    | $26,000,000                       | None                       |
| 3-1/8%      Series due 1979                    | 4,000,000                         | None                       |
| 3-5/8%      Series due 1981                    | 10,000,000                        | None                       |
| 4-3/4%      Series due 1987                    | 12,000,000                        | None                       |
| 6-1/2%      Series due 1998                    | 18,000,000                        | None                       |
| 8-1/8%      Series due 2001                    | 23,000,000                        | None                       |
| 10-1/2%      Series due 2005                   | 35,000,000                        | None                       |
| 8.70%      Series due 2006                     | 35,000,000                        | None                       |
| 8.35%      Series due 2007                     | 50,000,000                        | None                       |
| 9-1/4%      Series due 2008                    | 50,000,000                        | None                       |
| Pollution      Control Series A                | 111,000,000                       | None                       |
| Industrial      Development Series A           | 2,500,000                         | None                       |
| Industrial      Development Series B           | 1,800,000                         | None                       |
| Industrial      Development Series C           | 1,150,000                         | None                       |
| Pollution      Control Series B                | 13,500,000                        | None                       |
| Pollution      Control Series C                | 2,000,000                         | None                       |
| Pollution      Control Series D                | 3,600,000                         | None                       |
| 7-3/4%      Series due 1994                    | 55,000,000                        | None                       |
| 7-3/8%      Series due March 1, 1997           | 60,000,000                        | None                       |
| 7-3/4%      Series due June 1, 2007            | 55,000,000                        | None                       |
| 7-1/2%      Series due August 1, 2007          | 35,000,000                        | None                       |
| Pollution      Control Series E                | 111,000,000                       | None                       |
| 7%      Series due March 1, 2008               | 50,000,000                        | None                       |
| 6-1/4%      Series due July 1, 2003            | 25,000,000                        | None                       |
| 7%      Series due February 15, 2007           | 60,000,000                        | None                       |
| 6.68%      Series due November 15, 2007        | 20,000,000                        | None                       |
| Floating      Rate Series due October 20, 2003 | 250,000,000                       | None                       |
| Collateral      Series A                       | 255,000,000                       | None                       |
| Pollution      Control Series F                | 111,000,000                       | 111,000,000                |
| 5.28%      Series due August 1, 2020           | 35,000,000                        |  35,000,000           |
| 5.69%      Series due March 1, 2036            | 50,000,000                        |  50,000,000           |
| 5.99%      Series due February 1, 2027         | 60,000,000                        |  60,000,000           |
| 4.86%      Series due April 1, 2013            | 60,000,000                        |  60,000,000           |

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