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GOODWILL AND INTANGIBLES (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill balance by segment | The table below shows our goodwill balances by segment at September 30, 2021. We had no changes to the carrying amount of goodwill during the nine months ended September 30, 2021.
(in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Non-Utility Energy Infrastructure |  | Total
Goodwill balance (1) |  | $ | 2,104.3 |  |  | $ | 758.7 |  |  | $ | 183.2 |  |  | $ | 6.6 |  |  | $ | 3,052.8 |
(1)We had no accumulated impairment losses related to our goodwill as of September 30, 2021.
Schedule of intangible liabilities obtained through acquisitions by WECI | The intangible liabilities below were all obtained through acquisitions by WECI and are classified as other long-term liabilities on our balance sheets. See Note 2, Acquisitions, for more information.
|  | September 30, 2021 |  | December 31, 2020
(in millions) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
PPAs (1) |  | $ | 84.3 |  |  | $ | (4.9) |  |  | $ | 79.4 |  |  | $ | 76.1 |  |  | $ | — |  |  | $ | 76.1 |
Proxy revenue swap (2) |  | 7.2 |  |  | (1.9) |  |  | 5.3 |  |  | 7.2 |  |  | (1.3) |  |  | 5.9 |
Interconnection agreements (3) |  | 5.1 |  |  | (0.4) |  |  | 4.7 |  |  | 5.1 |  |  | (0.3) |  |  | 4.8 |
Total intangible liabilities |  | $ | 96.6 |  |  | $ | (7.2) |  |  | $ | 89.4 |  |  | $ | 88.4 |  |  | $ | (1.6) |  |  | $ | 86.8 |
(1) Represents PPAs related to the acquisition of Blooming Grove, Tatanka Ridge, and Jayhawk expiring between 2030 and 2032. The weighted-average remaining life of the PPAs is approximately 11 years. (2) Represents an agreement with a counterparty to swap the market revenue of Upstream's wind generation for fixed quarterly payments over 10 years, which expires in 2029. The remaining life of the proxy revenue swap is approximately seven years. (3) Represents interconnection agreements related to the acquisitions of Tatanka Ridge and Bishop Hill III, expiring in 2040 and 2041, respectively. These agreements relate to payments for connecting our facilities to the infrastructure of another utility to facilitate the movement of power onto the electric grid. The weighted-average remaining life of the interconnection agreements is approximately 19 years.
Schedule of amortization over the next five years | Amortization for the next five years is estimated to be:
|  | For the Years Ending December 31
(in millions) |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026
Amortization to be recorded in operating revenues |  | $ | 8.1 |  |  | $ | 8.1 |  |  | $ | 8.1 |  |  | $ | 8.1 |  |  | $ | 8.1 |
Amortization to be recorded in other operation and maintenance |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |

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