PROPERTY, PLANT, AND EQUIPMENT	6 Months Ended
Jun. 30, 2026
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT, AND EQUIPMENT	PROPERTY, PLANT, AND EQUIPMENT Wisconsin Segment Plant to be Retired Oak Creek Power Plant Units 7-8 The retirement of OCPP Units 7 and 8 became probable at the end of 2022, following initial PSCW approvals for replacement generation. On April 1, 2026, we announced plans to extend the operating lives of OCPP Units 7 and 8, and expect to have the units available to meet high energy demand periods through 2027. These units were previously scheduled to be retired at the end of 2026. The decision to postpone the retirement dates for these units is based on two critical factors, reliability and affordability for WE’s customers. This past winter the Midwest power market experienced tightened energy supply and higher energy costs during extreme temperatures. Keeping OCPP Units 7 and 8 available will better position WE to serve customers with safe, reliable and affordable energy on the hottest and coldest days of the year. The extension of these units will serve as a bridge until new dispatchable generation begins to come online, which is expected in late 2027. The total net book value of OCPP Units 7 and 8 was $604.6 million at June 30, 2026, which does not include deferred taxes. This amount was classified as plant to be retired within property, plant, and equipment on our balance sheet. These units are included in rate base, and WE continues to depreciate them on a straight-line basis using the composite depreciation rates approved by the PSCW. Samson Solar Energy LLC and Delilah Solar Energy LLC – Storm Damage During several storms that occurred in 2023 and 2024, certain sections of our Samson I solar facility incurred damage. We had previously recognized an impairment loss of $2.8 million related to damage from these storms, and recorded an offsetting $2.8 million receivable for future insurance recoveries. However, in the second quarter of 2025, we determined it was no longer probable that we would receive insurance proceeds sufficient to recover our losses associated with the 2023 and 2024 storms. As a result, the insurance receivable balance was written off, resulting in the recognition of the $2.8 million impairment loss within other operation and maintenance expense on our income statement. In March 2025, both our Samson I and Delilah I solar facilities experienced damage from a storm. In the second quarter of 2025, we recognized an impairment loss within other operation and maintenance expense on our income statement in the amount of $8.8 million, related to damage incurred associated with the March 2025 storm. The impairment loss associated with the March 2025 storm was increased from $8.8 million to $12.0 million in the third quarter of 2025 as a result of ongoing damage assessment. In addition, in June 2026, our Delilah I solar facility experienced minor damage from a storm, resulting in the recognition of a $1.7 million impairment loss within other operation and maintenance in the second quarter of 2026. As a result of storm damage sustained over the past several years, we have undertaken storm hardening efforts at both our Samson I and Delilah I solar facilities, and those efforts remain ongoing. The Peoples Gas Light and Coke Company Impairment In the fourth quarter of 2025, PGL recorded a $130.0 million impairment to property, plant, and equipment related to the terms of a proposed settlement that was finalized in May 2026, resolving its open proceedings related to the QIP Rider. See Note 24, Regulatory Environment, for more information.

The retirement of OCPP Units 7 and 8 became probable at the end of 2022, following initial PSCW approvals for replacement generation. On April 1, 2026, we announced plans to extend the operating lives of OCPP Units 7 and 8, and expect to have the units available to meet high energy demand periods through 2027. These units were previously scheduled to be retired at the end of 2026. The decision to postpone the retirement dates for these units is based on two critical factors, reliability and affordability for WE’s customers. This past winter the Midwest power market experienced tightened energy supply and higher energy costs during extreme temperatures. Keeping OCPP Units 7 and 8 available will better position WE to serve customers with safe, reliable and affordable energy on the hottest and coldest days of the year. The extension of these units will serve as a bridge until new dispatchable generation begins to come online, which is expected in late 2027.

The total net book value of OCPP Units 7 and 8 was $604.6 million at June 30, 2026, which does not include deferred taxes. This amount was classified as plant to be retired within property, plant, and equipment on our balance sheet. These units are included in rate base, and WE continues to depreciate them on a straight-line basis using the composite depreciation rates approved by the PSCW.

During several storms that occurred in 2023 and 2024, certain sections of our Samson I solar facility incurred damage. We had previously recognized an impairment loss of $2.8 million related to damage from these storms, and recorded an offsetting $2.8 million receivable for future insurance recoveries. However, in the second quarter of 2025, we determined it was no longer probable that we would receive insurance proceeds sufficient to recover our losses associated with the 2023 and 2024 storms. As a result, the insurance receivable balance was written off, resulting in the recognition of the $2.8 million impairment loss within other operation and maintenance expense on our income statement.

In March 2025, both our Samson I and Delilah I solar facilities experienced damage from a storm. In the second quarter of 2025, we recognized an impairment loss within other operation and maintenance expense on our income statement in the amount of $8.8 million, related to damage incurred associated with the March 2025 storm. The impairment loss associated with the March 2025 storm was increased from $8.8 million to $12.0 million in the third quarter of 2025 as a result of ongoing damage assessment.

In addition, in June 2026, our Delilah I solar facility experienced minor damage from a storm, resulting in the recognition of a $1.7 million impairment loss within other operation and maintenance in the second quarter of 2026.

As a result of storm damage sustained over the past several years, we have undertaken storm hardening efforts at both our Samson I and Delilah I solar facilities, and those efforts remain ongoing.

In the fourth quarter of 2025, PGL recorded a $130.0 million impairment to property, plant, and equipment related to the terms of a proposed settlement that was finalized in May 2026, resolving its open proceedings related to the QIP Rider. See Note 24, Regulatory Environment, for more information.