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MADISON GAS & ELECTRIC CO

For the period ended Mar 31, 2026. Filed May 5, 2026.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed May 5, 2026

MGEE$79.72-0.6%Stored close · as of Nov 10, 2026

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Contents

12. Joint Plant Construction Project Ownership

uction Project Ownership - MGE Energy and MGE.

MGE has ownership interests in generation projects with other co-owners, some of which are under construction, as shown in the following table. Incurred costs are reflected in "Property, plant, and equipment, net" or "Construction work in progress" on the consolidated balance sheets.

ProjectOwnership InterestSourceShare of GenerationShare of Estimated Costs(a)Costs incurred as of March 31, 2026(a)Estimated Date of Commercial Operation
Darien(b)(c)10%Battery7.5 MW$18 million(j)$7.4 million2027
Koshkonong(b)(d)10%Solar/Battery30 MW/16.5 MW$93 million(j)$65.9 million2026 Solar2027 Battery
High Noon(b)(e)10%Solar/Battery30 MW/16.5 MW$99 million$60.1 million2027
Columbia Energy Dome(b)(e)19%Storage3 MW$22 million(j)$2.0 million2027
Badger Hollow(b)(f)10%Wind11.2 MW$36 million$5.6 million2027
Whitetail(g)10%Wind6.7 MW$23 million$1.2 million2027
Dawn Harvest(b)(h)10%Solar15 MW$34 million$1.4 million2027
Ursa(b)(e)10%Solar20 MW$46 million$6.5 million2028
Saratoga(b)(i)10%Solar/Battery15 MW/5 MW$46 million$11.9 million2028
Good Oak(b)(e)10%Solar9.8 MW$22 million$1.7 million2028
Gristmill(b)(e)10%Solar6.7 MW$15 million$1.6 million2028

(a)

Excluding AFUDC.

(b)

MGE received specific approval to recover 100% AFUDC. During the three months ended March 31, 2026, MGE recognized $3.1 million, after tax, in AFUDC for these projects compared to $1.6 million for the comparable period in 2025.

(c)

Darien Solar Energy Center is located in Walworth and Rock Counties in southern Wisconsin.

(d)

Koshkonong Solar Energy Center is located in the Towns of Christiana and Deerfield in Dane County, Wisconsin.

(e)

Located in Columbia County, Wisconsin.

(f)

Badger Hollow Wind is located in Iowa and Grant Counties, Wisconsin.

(g)

Whitetail Wind is located in Grant County, Wisconsin.

(h)

Dawn Harvest Solar Energy Center is located in Rock County, Wisconsin.

(i)

Saratoga Solar Energy Center is located in Wood County, Wisconsin.

(j)

Estimated costs are expected to exceed PSCW previously approved Certificate of Authority (CA) levels. Notifications are provided to the PSCW when costs increase above CA levels. MGE has and will continue to request recovery of the updates in its rate case proceedings.

Reven

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.