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LONG-TERM DEBT | 3 Months Ended
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Mar. 31, 2025
Long-Term Debt, Unclassified [Abstract] |
LONG-TERM DEBT | LONG-TERM DEBT WEC Energy Group, Inc. Convertible Senior Notes As of March 31, 2025, the conditions allowing holders to convert their notes were not met. In accordance with the guidance in ASC Subtopic 470-20, Debt – Debt with Conversion and Other Options, the 2027 Notes and 2029 Notes were accounted for in their entirety as a liability on our balance sheet. The following is a summary of our convertible debt instruments as of March 31, 2025:
(in millions) |  | Principal Amount |  | Unamortized Debt Issuance Costs |  | Net Carrying Amount |  | Fair Value Amount (1)
2027 Notes |  | $ | 862.5 |  |  | $ | (7.2) |  |  | $ | 855.3 |  |  | $ | 1,009.0 |
2029 Notes |  | 862.5 |  |  | (8.3) |  |  | 854.2 |  |  | 1,029.2 |
(1) The fair values are categorized in Level 2 of the fair value hierarchy. See Note 13, Fair Value Measurements, for more information on the levels of the fair value hierarchy. The following table provides a summary of the interest expense recorded for each of the 2027 Notes and 2029 Notes:
(in millions) |  | Three Months Ended March 31, 2025 |  |
2027 Notes |  |  |  |
Contractual interest expense |  | $ | 9.4 |  |  |
Amortization of debt issuance costs |  | 0.8 |  |  |
Total interest expense – 2027 Notes |  | 10.2 |  |  |
2029 Notes |  |  |  |
Contractual interest expense |  | 9.4 |  |  |
Amortization of debt issuance costs |  | 0.5 |  |  |
Total interest expense – 2029 Notes |  | $ | 9.9 |  |  |
Minnesota Energy Resources Corporation In April 2025, MERC issued $50.0 million of 5.20% Senior Notes, due May 1, 2030, and used the net proceeds to repay MERC's $50.0 million of 2.69% Senior Notes that matured on May 1, 2025. Michigan Gas Utilities Corporation In April 2025, MGU issued $75.0 million of 5.20% Senior Notes, due May 1, 2030, and used the net proceeds to repay MGU's $60.0 million of 2.69% Senior Notes that matured on May 1, 2025 and intercompany short-term debt to its parent, Integrys.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/470/tableOfContent + Details
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