**Exhibit      4(a)3**

**ALLETE,      Inc.**

**(formerly      Minnesota Power & Light Company **

**and      formerly Minnesota Power, Inc.)**

**TO**

**THE      BANK OF NEW YORK**

**(formerly      Irving Trust Company)**

**AND**

**DOUGLAS      J. MacINNES**

**(successor      to Richard H. West, J. A. Austin,**

**E.      J. McCabe, D. W. May, J. A. Vaughan and W. T. Cunningham)**

**                            As      Trustees under      ALLETE, Inc.’s **

**                            Mortgage      and Deed of      Trust dated as of **

**                            September      1,      1945**

**Twenty-seventh      Supplemental Indenture**

**Providing,      among other things, for**

**First      Mortgage Bonds, 4.86% Series due April 1, 2013**

**(Thirty-third      Series)**

***Dated      as of**February 1, 2008***

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**TWENTY-SEVENTH      SUPPLEMENTAL INDENTURE**

**THIS      INDENTURE,**

| **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   |

| **Series**                                               | **Principal**   | **Principal** |
|----------------------------------------------------------|-----------------|---------------|
| **Amount**                                               | **Amount**      |
| **  Issued  **                       | **Outstanding** |
|                                                     |            |          |
| 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    |

**ARTICLE      I**

**Thirty-third      Series of Bonds**

**Optional      Prepayment.**

**Allocation      of Partial Prepayments**
**.  **

**Maturity;      Surrender, Etc.**

**Make-Whole      Amount**
**.**

**ARTICLE      II**

**Reservation      of Right to Amend the Mortgage**

**ARTICLE      III**

**Miscellaneous      Provisions**

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