| Exhibit 12                                                                                                                                 |   |
|--------------------------------------------------------------------------------------------------------------------------------------------|--------|
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| WISCONSIN PUBLIC SERVICE CORPORATION                                                                                                       |   |
| COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES AND                                                                                      |   |
| RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDEND REQUIREMENTS                                                               |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| (Millions)                                                                                                                                 |   | 2010 |   |   | 2009 |   |   | 2008 |   |   | 2007 |   |   | 2006 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| EARNINGS                                                                                                                                   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net Income from continuing operations                                                                                                      |   | $ | 135.0 |   |   | $ | 120.4 |   |   | $ | 132.3 |   |   | $ | 113.3 |   |   | $ | 102.1 |   |
| Provision for income taxes                                                                                                                 |   |   | 78.0 |   |   |   | 68.0 |   |   |   | 73.1 |   |   |   | 66.8 |   |   |   | 58.3 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Income from continuing operations before income taxes                                                                                      |   |   | 213.0 |   |   |   | 188.4 |   |   |   | 205.4 |   |   |   | 180.1 |   |   |   | 160.4 |   |
| Less: Undistributed earnings of less than 50% owned affiliates                                                                             |   |   | (1.7 | ) |   |   | (1.8 | ) |   |   | (2.2 | ) |   |   | (2.5 | ) |   |   | (3.2 | ) |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Adjusted income from continuing operations before income taxes                                                                             |   |   | 211.3 |   |   |   | 186.6 |   |   |   | 203.2 |   |   |   | 177.6 |   |   |   | 157.2 |   |
| Total fixed charges as defined                                                                                                             |   |   | 56.9 |   |   |   | 58.5 |   |   |   | 48.1 |   |   |   | 45.3 |   |   |   | 42.3 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total earnings as defined                                                                                                                  |   | $ | 268.2 |   |   | $ | 245.1 |   |   | $ | 251.3 |   |   | $ | 222.9 |   |   | $ | 199.5 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| FIXED CHARGES                                                                                                                              |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                                                                           |   | $ | 54.4 |   |   | $ | 54.0 |   |   | $ | 44.0 |   |   | $ | 43.5 |   |   | $ | 40.4 |   |
| Allowance for funds used during construction                                                                                               |   |   | 0.3 |   |   |   | 2.0 |   |   |   | 1.8 |   |   |   | 0.3 |   |   |   | 0.2 |   |
| Interest factor applicable to rentals                                                                                                      |   |   | 2.2 |   |   |   | 2.5 |   |   |   | 2.3 |   |   |   | 1.5 |   |   |   | 1.7 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total fixed charges as defined                                                                                                             |   | $ | 56.9 |   |   | $ | 58.5 |   |   | $ | 48.1 |   |   | $ | 45.3 |   |   | $ | 42.3 |   |
| Preferred stock dividend requirements *                                                                                                    |   |   | 5.2 |   |   |   | 4.9 |   |   |   | 4.8 |   |   |   | 4.9 |   |   |   | 4.9 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total fixed charges and preferred stock dividend requirements                                                                              |   | $ | 62.1 |   |   | $ | 63.4 |   |   | $ | 52.9 |   |   | $ | 50.2 |   |   | $ | 47.2 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| RATIO OF EARNINGS TO FIXED CHARGES                                                                                                         |   |   | 4.7 |   |   |   | 4.2 |   |   |   | 5.2 |   |   |   | 4.9 |   |   |   | 4.7 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDEND REQUIREMENTS                                                               |   |   | 4.3 |   |   |   | 3.9 |   |   |   | 4.7 |   |   |   | 4.4 |   |   |   | 4.2 |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| * Represents preferred stock dividend requirements of WPS computed by dividing the preferred stock dividend requirements by 100% minus the |   |
|   income tax rate.                                                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                                                                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |

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