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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  |
| Twenty-eighth      Supplemental Indenture  | May      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                 |
| 6.02%      Series due May 1, 2023              | 75,000,000                        | 75,000,000                 |

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