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GOODWILL AND INTANGIBLES | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND INTANGIBLES | GOODWILL AND INTANGIBLES Goodwill Goodwill represents the excess of the cost of an acquisition over the fair value of the identifiable net assets acquired. The table below shows our goodwill balances by segment at March 31, 2024. We had no changes to the carrying amount of goodwill during the three months ended March 31, 2024.
(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 March 31, 2024. Intangible Assets At both March 31, 2024 and December 31, 2023, we had $29.3 million of indefinite-lived intangible assets, largely consisting of spectrum frequencies. The spectrum frequencies enable the utilities to transmit data and voice communications over a wavelength dedicated to us throughout our service territories. We also have $5.2 million of other indefinite-lived intangible assets, consisting of a MGU trade name from a previous acquisition. These indefinite-lived intangible assets are included in other long-term assets on our balance sheets. Intangible Liabilities The intangible liabilities below were all obtained through acquisitions by WECI.
|  | March 31, 2024 |  | December 31, 2023
(in millions) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
PPAs (1) |  | $ | 653.9 |  |  | $ | (79.8) |  |  | $ | 574.1 |  |  | $ | 653.9 |  |  | $ | (66.6) |  |  | $ | 587.3 |
Proxy revenue swap (2) |  | 7.2 |  |  | (3.6) |  |  | 3.6 |  |  | 7.2 |  |  | (3.5) |  |  | 3.7 |
Interconnection agreements (3) |  | 4.7 |  |  | (1.0) |  |  | 3.7 |  |  | 4.7 |  |  | (0.9) |  |  | 3.8 |
Total intangible liabilities |  | $ | 665.8 |  |  | $ | (84.4) |  |  | $ | 581.4 |  |  | $ | 665.8 |  |  | $ | (71.0) |  |  | $ | 594.8 |
(1) Represents PPAs related to the acquisition of Blooming Grove Wind Energy Center LLC , Tatanka Ridge, Jayhawk, Thunderhead Wind Energy LLC, Samson I, and Sapphire Sky expiring between 2030 and 2037. The weighted-average remaining useful life of the PPAs is 11 years. (2) Represents an agreement with a counterparty to swap the market revenue of Upstream Wind Energy LLC's wind generation for fixed quarterly payments over 10 years, which expires in 2029. The remaining useful life of the proxy revenue swap is five years. (3) Represents interconnection agreements related to the acquisitions of Tatanka Ridge and Bishop Hill Energy III LLC, 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 useful life of the interconnection agreements is 17 years. Amortization related to these intangible liabilities for the three months ended March 31, 2024 and 2023, was $13.4 million and $10.4 million, respectively. Amortization for the next five years, including amounts recorded through March 31, 2024, is estimated to be:
|  | For the Years Ending December 31
(in millions) |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028
Amortization to be recorded as an increase to operating revenues |  | $ | 53.4 |  |  | $ | 53.4 |  |  | $ | 53.4 |  |  | $ | 53.4 |  |  | $ | 53.4 |
Amortization to be recorded as a decrease to other operation and maintenance |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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