WISCONSIN PUBLIC SERVICE CORP

Electric Facilities

The following table summarizes information on our electric generation facilities, including wholly owned and jointly owned facilities, as of December 31, 2025:

Name · Location · Fuel · Number of Generating Units · Capacity In MW (1)

Natural gas-fired plants

Fox Energy Center · Wrightstown, WI · Natural Gas · 3 · 579

De Pere Energy Center · De Pere, WI · Natural Gas/Oil · 1 · 170

West Marinette Power Plant · Marinette, WI · Natural Gas · 3 · 149

Whitewater · Whitewater, WI · Natural Gas/Oil · 1 · 117 · (2)

Pulliam · Green Bay, WI · Natural Gas · 1 · 82

Weston · Rothschild, WI · Natural Gas · 7 · 65 · (2)

Total natural gas-fired plants · 16 · 1,162

Coal-fired plants

Weston · Rothschild, WI · Coal · 2 · 699 · (2) (5)

Columbia · Portage, WI · Coal · 2 · 306 · (2)

Total coal-fired plants · 4 · 1,005

Wind facilities

Crane Creek Wind Park · Howard County, IA · Wind · 66 · 99

Red Barn · Grant County, WI · Wind · 28 · 82 · (2)

Forward Wind · Fond du Lac County, WI · Wind · 86 · 62 · (2)

Total wind facilities · 180 · 243

Solar facilities

Two Creeks · Manitowoc County WI · Solar · 48 · 100 · (2)

Badger Hollow I · Iowa County, WI · Solar · 41 · 100 · (2)

Darien · Rock and Walworth counties, WI · Solar · 65 · 37 · (2)

Paris · Kenosha County, WI · Solar · 53 · 30 · (2)

DER facility · Oneida County, WI · Solar · 3 · 8 · (6)

Total solar facilities · 210 · 275

Other renewable facilities

Hydro plants (17 in number) · WI · Hydro · 50 · 45 · (3) (4)

Total other renewable facilities · 50 · 45

Total system · 460 · 2,730

(1) Capacity for our electric generation facilities, other than wind and solar generating facilities, is based on rated capacity, which is the net power output under average operating conditions with equipment in an average state of repair as of a given month in a given year. Values are primarily based on the net dependable expected capacity ratings for summer 2026 established by tests and may change slightly from year to year. The summer period is the most relevant for capacity planning purposes. This is a result of continually reaching demand peaks in the summer months, primarily due to air conditioning demand. Capacity for wind generating facilities is based on nameplate capacity, which is the amount of energy a turbine should produce at optimal wind speeds. Capacity for solar generating facilities is based on nameplate capacity, which is the maximum output that a generator should produce at continuous full power.

(2) We jointly own these facilities with various other affiliated and unaffiliated entities. The capacity indicated for each of these units is equal to our portion of total plant capacity based on our percent of ownership. See Note 8, Jointly-Owned Utility Facilities, for more information.

(3) All of our hydroelectric facilities follow FERC guidelines and/or regulations.

(4) WRPC owns and operates the Castle Rock and Petenwell units. We hold a 50.0% ownership interest in WRPC and are entitled to 50.0% of the total capacity at Castle Rock and Petenwell. Our share of capacity for Castle Rock and Petenwell is 7.0 MWs and 10.3 MWs, respectively.

(5) WEC Energy Group expects to retire approximately 900 MWs of additional coal-fired generation, which includes the planned retirement of Weston Unit 3.

(6) DER facilities are distribution system interconnected solar projects that are typically 5-10 MWs each.

2025 Form 10-K · 28 · Wisconsin Public Service Corporation

As of December 31, 2025, we operated approximately 13,600 miles of overhead distribution lines and approximately 9,500 miles of underground distribution cable, as well as 118 electric distribution substations and approximately 312,200 line transformers.

Battery Energy Storage Systems

We also own 16.5 MWs of BESS at Paris located in Kenosha County, WI which was completed in June 2025.

Natural Gas Facilities

At December 31, 2025, our natural gas properties were located in northeastern Wisconsin and consisted of the following:

•Approximately 8,600 miles of natural gas distribution mains,

•Approximately 250 miles of natural gas transmission mains,

•Approximately 319,800 natural gas lateral services, and

•Approximately 100 natural gas distribution and transmission gate stations.

Our natural gas distribution and gas storage systems included distribution and transmission mains connected to the pipeline transmission systems of ANR Pipeline Company, Great Lakes Transmission Company, Guardian Pipeline L.L.C., and Vector Pipeline.

We also own office buildings, natural gas regulating and metering stations, and major service centers, including garage and warehouse facilities, in certain communities we serve. Where distribution lines and services and natural gas distribution mains and services occupy private property, we have in some, but not all instances, obtained consents, permits, or easements for these installations from the apparent owners or those in possession of those properties, generally without an examination of ownership records or title.

• Our operations and future results may be impacted by changing expectations and demands of our customers, regulators, investors, and other stakeholders.
• Our operations and WEC Energy Group's corporate strategy may be adversely affected by supply chain disruptions, inflation, and tariffs.
• We are actively involved with multiple significant capital projects, which are subject to a number of risks and uncertainties that could adversely affect project costs and completion of construction projects.
• Our operations are subject to risks beyond our control, including but not limited to, cybersecurity intrusions, terrorist or other physical attacks, acts of war, or unauthorized access to personally identifiable information.
• Adoption of AI technologies could adversely affect our business, reputation, or financial results.
• Advances in technology, and legislation or regulations supporting such technology, could make our electric generating facilities less competitive and may impact the demand for natural gas.
• We may fail to attract and retain an appropriately qualified workforce.
• Our counterparties may fail to meet their obligations, including obligations under power purchase, natural gas supply, natural gas pipeline capacity, and transportation agreements.
• Risks Related to Economic and Market Volatility
• Our business is dependent on our ability to successfully access credit and capital markets on competitive terms and rates.
• A downgrade in our credit ratings could negatively affect our ability to access capital at reasonable costs and/or require the posting of collateral.
• The fluctuation in demand for certain commodities and their respective prices could negatively impact our operations.
• We may not be able to obtain an adequate supply of coal, which could limit our ability to operate our coal-fired facilities.
• Our use of derivative contracts could result in financial losses.
• Restructuring in the regulated energy industry and competition in the retail and wholesale markets could have a negative impact on our business and revenues.
• Volatility in the securities markets, interest rates, changes in assumptions, market conditions, and other factors may impact the performance of our benefit plan holdings and other investment funds.
• General Risks
• We may be unable to obtain insurance on acceptable terms or at all, and the insurance coverage we do obtain may not provide protection against all significant losses.