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FAIR VALUE MEASUREMENTS | 6 Months Ended
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Jun. 30, 2026
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | FAIR VALUE MEASUREMENTS Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). Fair value accounting rules provide a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are defined as follows: Level 1 – Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 – Pricing inputs are observable, either directly or indirectly, but are not quoted prices included within Level 1. Level 2 includes those financial instruments that are valued using external inputs within models or other valuation methods. Level 3 – Pricing inputs include significant inputs that are generally less observable from objective sources. These inputs may be used with internally developed methods that result in management's best estimate of fair value. Level 3 instruments include those that may be more structured or otherwise tailored to customers' needs. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. We use a mid-market pricing convention (the mid-point price between bid and ask prices) as a practical measure for valuing certain derivative assets and liabilities. We primarily use a market approach for recurring fair value measurements and attempt to use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. When possible, we base the valuations of our assets and liabilities on quoted prices for identical assets and liabilities in active markets. These valuations are classified in Level 1. The valuations of certain contracts not classified as Level 1 may be based on quoted market prices received from counterparties and/or observable inputs for similar instruments. Transactions valued using these inputs are classified in Level 2. Certain derivatives, such as FTRs and TCRs, are categorized in Level 3 due to the significance of unobservable or internally-developed inputs. FTRs and TCRs are valued using auction prices from the applicable regional transmission organization. The following tables summarize our financial assets and liabilities that were accounted for at fair value on a recurring basis, categorized by level within the fair value hierarchy:
|  | June 30, 2026
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Derivative assets |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 1.4 |  |  | $ | 19.4 |  |  | $ | — |  |  | $ | 20.8 |
FTRs |  | — |  |  | — |  |  | 24.3 |  |  | 24.3 |
Total derivative assets |  | $ | 1.4 |  |  | $ | 19.4 |  |  | $ | 24.3 |  |  | $ | 45.1 |
Investments held in rabbi trust |  | $ | 43.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 43.4 |
Derivative liabilities |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 35.0 |  |  | $ | 6.9 |  |  | $ | — |  |  | $ | 41.9 |
|  | December 31, 2025
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Derivative assets |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 1.5 |  |  | $ | 18.3 |  |  | $ | — |  |  | $ | 19.8 |
FTRs |  | — |  |  | — |  |  | 6.5 |  |  | 6.5 |
Total derivative assets |  | $ | 1.5 |  |  | $ | 18.3 |  |  | $ | 6.5 |  |  | $ | 26.3 |
Investments held in rabbi trust |  | $ | 42.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 42.0 |
Derivative liabilities |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 23.3 |  |  | $ | 8.4 |  |  | $ | — |  |  | $ | 31.7 |
FTRs |  | — |  |  | — |  |  | 0.8 |  |  | 0.8 |
Total derivative liabilities |  | $ | 23.3 |  |  | $ | 8.4 |  |  | $ | 0.8 |  |  | $ | 32.5 |
The tables above include derivative assets and liabilities for options, futures, physical commodity contracts, and other instruments used to manage market risks related to changes in commodity prices. Both tables also include FTRs used at our electric utilities to manage electric transmission congestion costs in the MISO Energy Markets. Additionally, the December 31, 2025 table includes FTRs used at certain of our non-utility wind parks to manage electric transmission congestion costs in the MISO Energy Markets. These FTRs were all settled as of June 30, 2026. We hold investments in the Integrys rabbi trust. These investments are used to fund participants' benefits under the Integrys deferred compensation plan and certain Integrys non-qualified pension plans. These investments are included in other long-term assets on our balance sheets. For the three months ended June 30, 2026 and 2025, the net unrealized gains included in earnings related to the investments held at the end of the period were $5.6 million and $3.7 million, respectively. For the six months ended June 30, 2026 and 2025, the net unrealized gains included in earnings related to the investments held at the end of the period were $3.9 million and $1.9 million, respectively. The following table summarizes the changes to derivatives classified as Level 3 in the fair value hierarchy:
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(in millions) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Balance at the beginning of the period |  | $ | 1.9 |  |  | $ | 3.0 |  |  | $ | 5.7 |  |  | $ | 7.8 |
Purchases |  | 28.2 |  |  | 22.5 |  |  | 28.2 |  |  | 23.7 |
Net realized and unrealized gains included in earnings (1) |  | — |  |  | 0.3 |  |  | — |  |  | — |
Sales |  | (0.1) |  |  | — |  |  | (0.4) |  |  | — |
Settlements |  | (5.7) |  |  | (6.8) |  |  | (9.2) |  |  | (12.5) |
Balance at the end of the period |  | $ | 24.3 |  |  | $ | 19.0 |  |  | $ | 24.3 |  |  | $ | 19.0 |
(1)Amounts relate to FTRs and TCRs included in our non-utility energy infrastructure segment. These net realized and unrealized gains were recorded in operating revenues on our income statements. Fair Value of Financial Instruments The following table shows the financial instruments included on our balance sheets that were not recorded at fair value:
|  | June 30, 2026 |  | December 31, 2025
(in millions) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Preferred stock of subsidiary |  | $ | 30.4 |  |  | $ | 21.3 |  |  | $ | 30.4 |  |  | $ | 21.2 |
Long-term debt, including current portion |  | 20,629.8 |  |  | 20,140.2 |  |  | 20,017.5 |  |  | 19,609.1 |
The fair values of our long-term debt and preferred stock are categorized within Level 2 of the fair value hierarchy.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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