----

----

----

| 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       |
| Twenty-ninth Supplemental Indenture                                                                                        | November 1, 2008  |
| Thirtieth Supplemental Indenture                                                                                           | January 1, 2009   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |              |

| Series                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Principal  Amount   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                 |
| 6.94% Series due January 15, 2014                                                                                          | 18,000,000                                            | 18,000,000                 |
| 7.70% Series due January 15, 2016                                                                                          | 20,000,000                                            | 20,000,000                 |
| 8.17% Series due January 15, 2019                                                                                          | 42,000,000                                            | 42,000,000                 |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                                                  |                       |

----

----

----

----

----

----