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United States SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended: June 30, 2026 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from _______________ to _______________
Commission File No. |  | Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No. |  | IRS Employer Identification No.
000-49965 |  | MGE Energy, Inc. (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | mgeenergy.com |  | 39-2040501
000-1125 |  | Madison Gas and Electric Company (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | mge.com |  | 39-0444025

Securities registered pursuant to Section 12(b) of the Act:

Title of each class |  | Trading symbol(s) |  | Name of each exchange on which registered
Common Stock, $1 Par Value Per Share |  | MGEE |  | The NASDAQ Stock Market

Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days:

MGE Energy, Inc. Yes ☒ No ☐ | Madison Gas and Electric Company Yes ☒ No ☐

Indicate by check mark whether the registrants have submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrants were required to submit such files):

MGE Energy, Inc. Yes ☒ No ☐ | Madison Gas and Electric Company Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

| Large Accelerated Filer | Accelerated Filer | Non-accelerated Filer | Smaller Reporting Company | Emerging Growth Company
MGE Energy, Inc. | ☒ | ☐ | ☐ | ☐ | ☐
Madison Gas and Electric Company | ☐ | ☐ | ☒ | ☐ | ☐

If an emerging growth company, indicate by check mark if the registrants have elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

MGE Energy, Inc. ☐ | Madison Gas and Electric Company ☐

Indicate by check mark whether the registrants are shell companies (as defined in Rule 12b-2 of the Exchange Act):

MGE Energy, Inc. Yes ☐ No ☒ | Madison Gas and Electric Company Yes ☐ No ☒

Number of Shares Outstanding of Each Class of Common Stock as of July 31, 2026
MGE Energy, Inc. | Common stock, $1.00 par value, 37,784,012 shares outstanding.
Madison Gas and Electric Company | Common stock, $1.00 par value, 17,347,894 shares outstanding (all of which are owned beneficially and of record by MGE Energy, Inc.).

1

PART I. FINANCIAL INFORMATION | 3
Filing Format | 3
Forward-Looking Statements | 3
Where to Find More Information | 3
Definitions, Abbreviations, and Acronyms Used in the Text and Notes of this Report | 4
Item 1. Financial Statements. | 6
MGE Energy, Inc. | 6
Consolidated Statements of Income (unaudited) | 6
Consolidated Statements of Cash Flows (unaudited) | 7
Consolidated Balance Sheets (unaudited) | 8
Consolidated Statements of Common Equity (unaudited) | 9
Madison Gas and Electric Company | 10
Consolidated Statements of Income (unaudited) | 10
Consolidated Statements of Cash Flows (unaudited) | 11
Consolidated Balance Sheets (unaudited) | 12
Consolidated Statements of Equity (unaudited) | 13
MGE Energy, Inc., and Madison Gas and Electric Company - Notes to Consolidated Financial Statements (unaudited) | 14
1. Summary of Significant Accounting Policies. | 14
2. New Accounting Standards. | 15
3. Investment in ATC and ATC Holdco. | 15
4. Taxes. | 16
5. Pension and Other Postretirement Plans. | 16
6. Equity and Financing Arrangements. | 17
7. Share-Based Compensation. | 18
8. Commitments and Contingencies. | 19
9. Rate Matters. | 22
10. Derivative and Hedging Instruments. | 23
11. Fair Value of Financial Instruments. | 25
12. Joint Plant Construction Project Ownership. | 28
13. Revenue. | 29
14. Segment Information. | 29
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations. | 33
Item 3. Quantitative and Qualitative Disclosures About Market Risk. | 47
Item 4. Controls and Procedures. | 47
PART II. OTHER INFORMATION. | 49
Item 1. Legal Proceedings. | 49
Item 1A. Risk Factors. | 49
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds. | 49
Item 3. Defaults Upon Senior Securities. | 49
Item 4. Mine Safety Disclosures. | 49
Item 5. Other Information. | 49
Item 6. Exhibits. | 50
Signatures - MGE Energy, Inc. | 51
Signatures - Madison Gas and Electric Company. | 52

2

## PART I. FINANCIAL INFORMATION.

#

# Filing Format

This combined Form 10-Q is being filed separately by MGE Energy, Inc. (MGE Energy) and Madison Gas and Electric Company (MGE). MGE is a wholly owned subsidiary of MGE Energy and represents a majority of its assets, liabilities, revenues, expenses, and operations. Thus, all information contained in this report relates to, and is filed by, MGE Energy. Information that is specifically identified in this report as relating solely to MGE Energy, such as its financial statements and information relating to its nonregulated business, does not relate to, and is not filed by, MGE. MGE makes no representation as to that information. The terms "we" and "our," as used in this report, refer to MGE Energy and its consolidated subsidiaries, unless otherwise indicated.

# Forward-Looking Statements

Certain matters discussed in this report include "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. All statements that are not statements of historical facts are, or may be deemed to be, forward-looking statements. Such forward-looking statements are based on historical performance and current expectations, estimates, forecasts and projections about our future financial results, goals, plans, commitments, strategies and objectives, particularly related to future load growth, revenues, expenses, capital expenditures and rate recovery, financial resources, regulatory matters, and the scope and expense associated with future environmental regulation. Such statements involve inherent risks, assumptions and uncertainties, known or unknown, including internal or external factors that could delay, divert or change any of them, that are difficult to predict, may be beyond our control and could cause our future financial results, goals, plans and objectives to differ materially from those expressed in, or implied by, the statements. Words such as "believe," "expect," "anticipate," "estimate," "could," "should," "intend," "will," "commit," "target," "plan," and other similar words, and words relating to goals, targets and projections, generally identify forward-looking statements. Both MGE Energy and MGE caution investors that these forward-looking statements are subject to known and unknown risks and uncertainties that may cause actual results to differ materially from those projected, expressed, or implied.

The factors that could cause actual results to differ materially from the forward-looking statements made by a registrant include (a) those factors discussed in the following sections of the registrants' 2025 Annual Report on Form 10-K: Item 1A. Risk Factors; Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, as updated by Part I, Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations in this report; and Item 8. Financial Statements and Supplementary Data – Footnote 16, as updated by Part I, Item 1. Financial Statements – Footnote 8 in this report; and (b) other factors discussed herein and in other filings made by that registrant with the Securities and Exchange Commission (SEC).

Readers are cautioned not to place undue reliance on these forward-looking statements, which apply only as of the date of this report. MGE Energy and MGE undertake no obligation to publicly update or revise any forward-looking statement to reflect events or circumstances after the date of this report, whether as a result of new information, future events, changed circumstances or otherwise, except as required by law.

# Where to Find More Information

We file annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K and other information with the SEC. The SEC maintains an internet site at www.sec.gov that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

MGE Energy maintains a website at mgeenergy.com, and MGE maintains a website at mge.com. Copies of the reports and other information that we file with the SEC may be obtained from our websites free of charge. Information contained on MGE Energy's and MGE's websites shall not be deemed incorporated into, or to be a part of, this report.

3

Definitions, Abbreviations, and Acronyms Used in the Text and Notes of this Report

Abbreviations, acronyms, and definitions used in the text and notes of this report are defined below.

MGE Energy and Subsidiaries: |
CWDC | Central Wisconsin Development Corporation
MAGAEL | MAGAEL, LLC
MGE | Madison Gas and Electric Company
MGE Energy | MGE Energy, Inc.
MGE Power | MGE Power, LLC
MGE Power Elm Road | MGE Power Elm Road, LLC
MGE Power West Campus | MGE Power West Campus, LLC
MGE Services | MGE Services, LLC
MGE State Energy Services | MGE State Energy Services, LLC
MGE Transco | MGE Transco Investment, LLC
MGEE Transco | MGEE Transco, LLC
North Mendota | North Mendota Energy & Technology Park, LLC
Other Defined Terms: |
2025 Annual Report on Form 10-K | MGE Energy's and MGE's Annual Report on Form 10-K for the year ended December 31, 2025
2024 ELG Rule | Supplemental Effluent Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category
2021 Incentive Plan | MGE Energy's 2021 Long-Term Incentive Plan
AD/CVD | Antidumping and Countervailing Duties
AFUDC | Allowance for Funds Used During Construction
ATC | American Transmission Company LLC
ATC Holdco | ATC Holdco, LLC
ATM | At-the-Market Offering Program
Badger Hollow | Badger Hollow Solar Park
Blount | Blount Station
BTA | Best Technology Available
CA | Certificate of Authority
CBP | U.S. Customs and Border Protection
CCR | Coal Combustion Residual
Codification | Financial Accounting Standards Board Accounting Standards Codification
Columbia | Columbia Energy Center
Cooling degree days (CDD) | Measure of the extent to which the average daily temperature is above 65 degrees Fahrenheit, which is considered an indicator of possible increased demand for energy to provide cooling
CWIP | Construction Work in Progress
Dth | Dekatherms, a quantity measure for natural gas
DOC | United States Department of Commerce
Elm Road Units | Elm Road Generating Station
EPA | United States Environmental Protection Agency
FERC | Federal Energy Regulatory Commission
FTR | Financial Transmission Rights
GHG | Greenhouse gas
Heating degree days (HDD) | Measure of the extent to which the average daily temperature is below 65 degrees Fahrenheit, which is considered an indicator of possible increased demand for energy to provide heating
High Noon | High Noon Solar Energy Center
IRS | Internal Revenue Service
ITC | Investment Tax Credit
Koshkonong | Koshkonong Solar Park
kWh | Kilowatt-hour, a measure of electric energy produced
MISO | Midcontinent Independent System Operator, Inc.
MW | Megawatt, a measure of electric energy generating capacity
MWh | Megawatt-hour, a measure of electric energy produced
NAAQS | National Ambient Air Quality Standards
Nasdaq | The Nasdaq Stock Market
NO x | Nitrogen Oxide
OBBBA | One Big Beautiful Bill Act
Paris | Paris Solar-Battery Park

4

PGA | Purchased Gas Adjustment clause, a regulatory mechanism used to reconcile natural gas costs recovered in rates to actual costs
PM | Particulate Matter
PSCW | Public Service Commission of Wisconsin
PTC | Production Tax Credit
ROE | Return on Equity
Saratoga | Saratoga Solar Electric Generation and BESS Facility
SEC | Securities and Exchange Commission
SO 2 | Sulfur Dioxide
Stock Plan | Direct Stock Purchase and Dividend Reinvestment Plan of MGE Energy
Sunnyside | Sunnyside Solar and Battery Project
Therm | Measure of quantity of heat used to measure gas supply
UFLPA | Uyghur Forced Labor Prevention Act
Ursa | Ursa Solar Electric Generation Facility
USITC | United States International Trade Commission
VIE | Variable Interest Entity
WCCF | West Campus Cogeneration Facility
WDNR | Wisconsin Department of Natural Resources
WEPCO | Wisconsin Electric Power Company, a subsidiary of WEC Energy Group, Inc.
West Riverside | West Riverside Energy Center
WPDES | Wisconsin Pollutant Discharge Elimination System
WRO | Withhold Release Order
XBRL | eXtensible Business Reporting Language

5

Item 1. Financi al Statements.

MGE E nergy, Inc.

Consolidated Statements of Income (unaudited)

(In thousands, except per share amounts)

|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Operating Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Electric revenues |  | $ | 131,594 |  |  | $ | 129,527 |  |  | $ | 263,034 |  |  | $ | 255,016 |
Gas revenues |  |  | 29,601 |  |  |  | 29,925 |  |  |  | 140,864 |  |  |  | 123,406 |
Total Operating Revenues |  |  | 161,195 |  |  |  | 159,452 |  |  |  | 403,898 |  |  |  | 378,422 |
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Fuel for electric generation |  |  | 12,907 |  |  |  | 16,292 |  |  |  | 33,216 |  |  |  | 33,861 |
Purchased power |  |  | 5,813 |  |  |  | 5,562 |  |  |  | 8,280 |  |  |  | 9,940 |
Cost of gas sold |  |  | 9,285 |  |  |  | 11,313 |  |  |  | 80,108 |  |  |  | 65,277 |
Other operations and maintenance |  |  | 65,242 |  |  |  | 57,777 |  |  |  | 126,810 |  |  |  | 114,336 |
Depreciation and amortization |  |  | 28,939 |  |  |  | 28,354 |  |  |  | 57,028 |  |  |  | 56,032 |
Other general taxes |  |  | 6,375 |  |  |  | 5,931 |  |  |  | 12,670 |  |  |  | 11,888 |
Total Operating Expenses |  |  | 128,561 |  |  |  | 125,229 |  |  |  | 318,112 |  |  |  | 291,334 |
Operating Income |  |  | 32,634 |  |  |  | 34,223 |  |  |  | 85,786 |  |  |  | 87,088 |
Other income, net |  |  | 14,286 |  |  |  | 3,707 |  |  |  | 25,276 |  |  |  | 6,311 |
Interest expense, net |  |  | (9,288 | ) |  |  | (8,457 | ) |  |  | (19,093 | ) |  |  | (16,038 | )
Income before income taxes |  |  | 37,632 |  |  |  | 29,473 |  |  |  | 91,969 |  |  |  | 77,361 |
Income tax provision |  |  | (4,279 | ) |  |  | (2,975 | ) |  |  | (10,135 | ) |  |  | (9,271 | )
Net Income |  | $ | 33,353 |  |  | $ | 26,498 |  |  | $ | 81,834 |  |  | $ | 68,090 |
Earnings Per Share of Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.89 |  |  | $ | 0.73 |  |  | $ | 2.21 |  |  | $ | 1.86 |
Diluted |  | $ | 0.89 |  |  | $ | 0.72 |  |  | $ | 2.21 |  |  | $ | 1.86 |
Dividends per share of common stock |  | $ | 0.475 |  |  | $ | 0.450 |  |  | $ | 0.950 |  |  | $ | 0.900 |
Weighted Average Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 37,351 |  |  |  | 36,540 |  |  |  | 36,972 |  |  |  | 36,526 |
Diluted |  |  | 37,456 |  |  |  | 36,569 |  |  |  | 37,029 |  |  |  | 36,557 |

The accompanying notes are an integral part of the above unaudited consolidated financial statements.

6

MGE Energy, Inc.

Consolidated Statements of Cash Flows (unaudited)

(In thousands)

|  | Six Months Ended |
|  | June 30, |
|  | 2026 |  |  | 2025 |
Operating Activities: |  |  |  |  |  |
Net income |  | $ | 81,834 |  |  | $ | 68,090 |
Adjustments to reconcile net income to cash provided by operating activities |  |  |  |  |  |
Depreciation and amortization |  |  | 57,028 |  |  |  | 56,032 |
Deferred income taxes |  |  | 5,518 |  |  |  | 2,578 |
Provision for doubtful receivables |  |  | 3,513 |  |  |  | 4,400 |
Employee benefit plan credit |  |  | (4,232 | ) |  |  | (2,320 | )
Cash contributions to pension and other postretirement plans |  |  | (3,752 | ) |  |  | (3,800 | )
Equity earnings in investments |  |  | (7,336 | ) |  |  | (6,241 | )
Dividends from investments |  |  | 5,545 |  |  |  | 6,008 |
Changes in assets and liabilities |  |  |  |  |  |
Current assets |  |  | 23,420 |  |  |  | 13,105 |
Accounts payable |  |  | (21,055 | ) |  |  | (13,491 | )
Deferred income taxes |  |  | 9,532 |  |  |  | — |
Other current liabilities |  |  | 298 |  |  |  | (2,309 | )
Regulatory assets and liabilities, net |  |  | 9,995 |  |  |  | 7,381 |
Other, net |  |  | (11,480 | ) |  |  | 4,520 |
Cash Provided by Operating Activities |  |  | 148,828 |  |  |  | 133,953 |
Investing Activities: |  |  |  |  |  |
Capital expenditures |  |  | (210,906 | ) |  |  | (111,753 | )
Capital contributions to investments |  |  | (7,714 | ) |  |  | (5,871 | )
Other |  |  | 2,287 |  |  |  | (630 | )
Cash Used for Investing Activities |  |  | (216,333 | ) |  |  | (118,254 | )
Financing Activities: |  |  |  |  |  |
Issuance of common stock, net |  |  | 88,948 |  |  |  | 3,750 |
Cash dividends paid on common stock |  |  | (35,299 | ) |  |  | (32,872 | )
Repayments of long-term debt |  |  | (3,897 | ) |  |  | (2,625 | )
Issuance of long-term debt |  |  | 90,000 |  |  |  | — |
(Repayments of) proceeds from short-term debt |  |  | (59,777 | ) |  |  | 5,500 |
Other |  |  | (1,523 | ) |  |  | (812 | )
Cash Provided by (Used for) Financing Activities |  |  | 78,452 |  |  |  | (27,059 | )
Change in cash, cash equivalents, and restricted cash |  |  | 10,947 |  |  |  | (11,360 | )
Cash, cash equivalents, and restricted cash at beginning of period |  |  | 8,736 |  |  |  | 24,496 |
Cash, cash equivalents, and restricted cash at end of period |  | $ | 19,683 |  |  | $ | 13,136 |

The accompanying notes are an integral part of the above unaudited consolidated financial statements.

7

MGE Energy, Inc.

Consolidated Balance Sheets (unaudited)

(In thousands)

|  | June 30, |  |  | December 31, |
ASSETS |  | 2026 |  |  | 2025 |
Current Assets: |  |  |  |  |  |
Cash and cash equivalents |  | $ | 16,621 |  |  | $ | 5,666 |
Accounts receivable, less reserves of $11,049 and $8,578, respectively |  |  | 42,330 |  |  |  | 57,558 |
Other accounts receivable, less reserves of $2,318 and $2,084, respectively |  |  | 14,421 |  |  |  | 12,983 |
Unbilled revenues |  |  | 29,967 |  |  |  | 42,770 |
Materials and supplies, at average cost |  |  | 38,553 |  |  |  | 37,850 |
Fuel for electric generation, at average cost |  |  | 12,753 |  |  |  | 11,010 |
Stored natural gas, at average cost |  |  | 13,671 |  |  |  | 15,317 |
Prepaid taxes |  |  | 19,123 |  |  |  | 19,314 |
Regulatory assets - current |  |  | 8,705 |  |  |  | 8,879 |
Other current assets |  |  | 14,751 |  |  |  | 17,201 |
Total Current Assets |  |  | 210,895 |  |  |  | 228,548 |
Regulatory assets |  |  | 51,244 |  |  |  | 42,758 |
Pension and other postretirement benefit asset |  |  | 172,412 |  |  |  | 164,985 |
Other deferred assets and other |  |  | 19,872 |  |  |  | 18,348 |
Property, Plant, and Equipment: |  |  |  |  |  |
Property, plant, and equipment, net |  |  | 2,337,481 |  |  |  | 2,279,899 |
Construction work in progress |  |  | 372,628 |  |  |  | 292,969 |
Total Property, Plant, and Equipment |  |  | 2,710,109 |  |  |  | 2,572,868 |
Investments |  |  | 135,673 |  |  |  | 127,913 |
Total Assets |  | $ | 3,300,205 |  |  | $ | 3,155,420 |
LIABILITIES AND CAPITALIZATION |  |  |  |  |  |
Current Liabilities: |  |  |  |  |  |
Long-term debt due within one year |  | $ | 20,509 |  |  | $ | 21,633 |
Short-term debt |  |  | 34,750 |  |  |  | 94,527 |
Accounts payable |  |  | 66,836 |  |  |  | 117,673 |
Accrued interest and taxes |  |  | 12,127 |  |  |  | 10,269 |
Accrued payroll related items |  |  | 15,742 |  |  |  | 17,244 |
Regulatory liabilities - current |  |  | 23,801 |  |  |  | 23,490 |
Other current liabilities |  |  | 11,799 |  |  |  | 11,873 |
Total Current Liabilities |  |  | 185,564 |  |  |  | 296,709 |
Other Credits: |  |  |  |  |  |
Deferred income taxes |  |  | 340,423 |  |  |  | 337,798 |
Investment tax credit - deferred |  |  | 61,466 |  |  |  | 48,609 |
Regulatory liabilities |  |  | 197,539 |  |  |  | 185,372 |
Accrued pension and other postretirement benefits |  |  | 51,452 |  |  |  | 51,105 |
Asset retirement obligations |  |  | 79,395 |  |  |  | 76,289 |
Other deferred liabilities and other |  |  | 64,743 |  |  |  | 63,397 |
Total Other Credits |  |  | 795,018 |  |  |  | 762,570 |
Capitalization: |  |  |  |  |  |
Common shareholders' equity |  |  | 1,440,519 |  |  |  | 1,303,936 |
Long-term debt |  |  | 879,104 |  |  |  | 792,205 |
Total Capitalization |  |  | 2,319,623 |  |  |  | 2,096,141 |
Commitments and contingencies (see Footnote 8) |  |  |  |  |  |
Total Liabilities and Capitalization |  | $ | 3,300,205 |  |  | $ | 3,155,420 |

The accompanying notes are an integral part of the above unaudited consolidated financial statements.

8

MGE Energy, Inc.

Consolidated Statements of C ommon Equity (unaudited)

(In thousands, except per share amounts)

|  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |
|  |  |  |  | Additional |  |  |  |  |  | Other |  |  |  |
|  | Common |  |  | Paid-in |  |  | Retained |  |  | Comprehensive |  |  |  |
|  | Stock |  |  | Capital |  |  | Earnings |  |  | Income/(Loss) |  |  | Total |
Three Months Ended June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 36,537 |  |  | $ | 433,079 |  |  | $ | 789,297 |  |  | $ | — |  |  | $ | 1,258,913 |
Net income |  |  |  |  |  |  |  |  | 26,498 |  |  |  |  |  |  | 26,498 |
Common stock dividends declared ($0.450 per share) |  |  |  |  |  |  |  |  | (16,444 | ) |  |  |  |  |  | (16,444 | )
Issuance of common stock, net |  | 5 |  |  |  | 466 |  |  |  |  |  |  |  |  |  | 471 |
Equity-based compensation plans and other |  |  |  |  |  | 535 |  |  |  |  |  |  |  |  |  | 535 |
Ending Balance - June 30, 2025 |  | $ | 36,542 |  |  | $ | 434,080 |  |  | $ | 799,351 |  |  | $ | — |  |  | $ | 1,269,973 |
Three Months Ended June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 36,753 |  |  | $ | 449,098 |  |  | $ | 863,548 |  |  | $ | — |  |  | $ | 1,349,399 |
Net income |  |  |  |  |  |  |  |  | 33,353 |  |  |  |  |  |  | 33,353 |
Common stock dividends declared ($0.475 per share) |  |  |  |  |  |  |  |  | (17,931 | ) |  |  |  |  |  | (17,931 | )
Issuance of common stock, net |  |  | 1,028 |  |  |  | 73,906 |  |  |  |  |  |  |  |  |  | 74,934 |
Equity-based compensation plans and other |  |  |  |  |  | 764 |  |  |  |  |  |  |  |  |  | 764 |
Ending Balance - June 30, 2026 |  | $ | 37,781 |  |  | $ | 523,768 |  |  | $ | 878,970 |  |  | $ | — |  |  | $ | 1,440,519 |
Six Months Ended June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 36,490 |  |  | $ | 429,515 |  |  | $ | 764,133 |  |  | $ | — |  |  | $ | 1,230,138 |
Net income |  |  |  |  |  |  |  |  | 68,090 |  |  |  |  |  |  | 68,090 |
Common stock dividends declared ($0.900 per share) |  |  |  |  |  |  |  |  | (32,872 | ) |  |  |  |  |  | (32,872 | )
Issuance of common stock, net |  | 41 |  |  |  | 3,709 |  |  |  |  |  |  |  |  |  | 3,750 |
Equity-based compensation plans and other |  |  | 11 |  |  |  | 856 |  |  |  |  |  |  |  |  |  | 867 |
Ending Balance - June 30, 2025 |  | $ | 36,542 |  |  | $ | 434,080 |  |  | $ | 799,351 |  |  | $ | — |  |  | $ | 1,269,973 |
Six Months Ended June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | 36,542 |  |  | $ | 434,959 |  |  | $ | 832,435 |  |  | $ | — |  |  | $ | 1,303,936 |
Net income |  |  |  |  |  |  |  |  | 81,834 |  |  |  |  |  |  | 81,834 |
Common stock dividends declared ($0.950 per share) |  |  |  |  |  |  |  |  | (35,299 | ) |  |  |  |  |  | (35,299 | )
Issuance of common stock, net |  |  | 1,217 |  |  |  | 87,731 |  |  |  |  |  |  |  |  |  | 88,948 |
Equity-based compensation plans and other |  | 22 |  |  |  | 1,078 |  |  |  |  |  |  |  |  |  | 1,100 |
Ending Balance - June 30, 2026 |  | $ | 37,781 |  |  | $ | 523,768 |  |  | $ | 878,970 |  |  | $ | — |  |  | $ | 1,440,519 |

The accompanying notes are an integral part of the above unaudited consolidated financial statements.

9

Madison Gas a nd Electric Company

Consolidated Stateme nts of Income (unaudited)

(In thousands)

|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Operating Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Electric revenues |  | $ | 131,594 |  |  | $ | 129,527 |  |  | $ | 263,034 |  |  | $ | 255,016 |
Gas revenues |  |  | 29,601 |  |  |  | 29,925 |  |  |  | 140,864 |  |  |  | 123,406 |
Total Operating Revenues |  |  | 161,195 |  |  |  | 159,452 |  |  |  | 403,898 |  |  |  | 378,422 |
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Fuel for electric generation |  |  | 12,907 |  |  |  | 16,292 |  |  |  | 33,216 |  |  |  | 33,861 |
Purchased power |  |  | 5,813 |  |  |  | 5,562 |  |  |  | 8,280 |  |  |  | 9,940 |
Cost of gas sold |  |  | 9,285 |  |  |  | 11,313 |  |  |  | 80,108 |  |  |  | 65,277 |
Other operations and maintenance |  |  | 64,863 |  |  |  | 57,489 |  |  |  | 126,099 |  |  |  | 113,751 |
Depreciation and amortization |  |  | 28,939 |  |  |  | 28,354 |  |  |  | 57,028 |  |  |  | 56,032 |
Other general taxes |  |  | 6,375 |  |  |  | 5,931 |  |  |  | 12,670 |  |  |  | 11,888 |
Total Operating Expenses |  |  | 128,182 |  |  |  | 124,941 |  |  |  | 317,401 |  |  |  | 290,749 |
Operating Income |  |  | 33,013 |  |  |  | 34,511 |  |  |  | 86,497 |  |  |  | 87,673 |
Other income, net |  |  | 7,644 |  |  |  | 747 |  |  |  | 14,327 |  |  |  | 363 |
Interest expense, net |  |  | (9,366 | ) |  |  | (8,554 | ) |  |  | (19,190 | ) |  |  | (16,189 | )
Income before income taxes |  |  | 31,291 |  |  |  | 26,704 |  |  |  | 81,634 |  |  |  | 71,847 |
Income tax provision |  |  | (3,079 | ) |  |  | (2,229 | ) |  |  | (7,709 | ) |  |  | (7,569 | )
Net Income |  | $ | 28,212 |  |  | $ | 24,475 |  |  | $ | 73,925 |  |  | $ | 64,278 |
Less: Net Income Attributable to Noncontrolling Interest, net of tax |  |  | (5,729 | ) |  |  | (5,714 | ) |  |  | (11,335 | ) |  |  | (11,313 | )
Net Income Attributable to MGE |  | $ | 22,483 |  |  | $ | 18,761 |  |  | $ | 62,590 |  |  | $ | 52,965 |

The accompanying notes are an integral part of the above unaudited consolidated financial statements.

10

Madison Gas and Electric Company

Consolidated Statements of Cash Flows (unaudited)

(In thousands)

|  | Six Months Ended |
|  | June 30, |
|  | 2026 |  |  | 2025 |
Operating Activities: |  |  |  |  |  |
Net income |  | $ | 73,925 |  |  | $ | 64,278 |
Adjustments to reconcile net income to cash provided by operating activities |  |  |  |  |  |
Depreciation and amortization |  |  | 57,028 |  |  |  | 56,032 |
Deferred income taxes |  |  | 4,376 |  |  |  | 1,785 |
Provision for doubtful receivables |  |  | 3,513 |  |  |  | 4,400 |
Employee benefit plan credit |  |  | (4,232 | ) |  |  | (2,319 | )
Cash contributions to pension and other postretirement plans |  |  | (3,752 | ) |  |  | (3,800 | )
Changes in assets and liabilities |  |  |  |  |  |
Current assets |  |  | 22,278 |  |  |  | 13,107 |
Accounts payable |  |  | (21,297 | ) |  |  | (13,533 | )
Deferred income taxes |  |  | 9,532 |  |  |  | — |
Other current liabilities |  |  | 3,428 |  |  |  | (2,771 | )
Regulatory assets and liabilities, net |  |  | 9,995 |  |  |  | 7,381 |
Other, net |  |  | (8,344 | ) |  |  | 3,428 |
Cash Provided by Operating Activities |  |  | 146,450 |  |  |  | 127,988 |
Investing Activities: |  |  |  |  |  |
Capital expenditures |  |  | (210,906 | ) |  |  | (111,753 | )
Other |  |  | (3,116 | ) |  |  | (765 | )
Cash Used for Investing Activities |  |  | (214,022 | ) |  |  | (112,518 | )
Financing Activities: |  |  |  |  |  |
Cash dividends paid to parent by MGE |  |  | (18,000 | ) |  |  | (23,500 | )
Distributions to parent from noncontrolling interest |  |  | (8,250 | ) |  |  | (8,000 | )
Capital contribution from parent |  |  | 77,500 |  |  |  | — |
Repayments of long-term debt |  |  | (3,897 | ) |  |  | (2,625 | )
Issuance of long-term debt |  |  | 90,000 |  |  |  | — |
(Repayments of) proceeds from short-term debt |  |  | (59,777 | ) |  |  | 5,500 |
Other |  |  | (1,523 | ) |  |  | (812 | )
Cash Provided by (Used for) Financing Activities |  |  | 76,053 |  |  |  | (29,437 | )
Change in cash, cash equivalents, and restricted cash |  |  | 8,481 |  |  |  | (13,967 | )
Cash, cash equivalents, and restricted cash at beginning of period |  |  | 5,318 |  |  |  | 20,059 |
Cash, cash equivalents, and restricted cash at end of period |  | $ | 13,799 |  |  | $ | 6,092 |

The accompanying notes are an integral part of the above unaudited consolidated financial statements.

11

Madison Gas and Electric Company

Consolidated Balan ce Sheets (unaudited)

(In thousands)

|  | June 30, |  |  | December 31, |
ASSETS |  | 2026 |  |  | 2025 |
Current Assets: |  |  |  |  |  |
Cash and cash equivalents |  | $ | 10,737 |  |  | $ | 2,248 |
Accounts receivable, less reserves of $11,049 and $8,578, respectively |  |  | 42,330 |  |  |  | 57,558 |
Other accounts receivable, less reserves of $2,318 and $2,084, respectively |  |  | 14,419 |  |  |  | 12,979 |
Unbilled revenues |  |  | 29,967 |  |  |  | 42,770 |
Materials and supplies, at average cost |  |  | 38,553 |  |  |  | 37,850 |
Fuel for electric generation, at average cost |  |  | 12,753 |  |  |  | 11,010 |
Stored natural gas, at average cost |  |  | 13,671 |  |  |  | 15,317 |
Prepaid taxes |  |  | 19,027 |  |  |  | 18,748 |
Regulatory assets - current |  |  | 8,705 |  |  |  | 8,879 |
Other current assets |  |  | 15,445 |  |  |  | 17,225 |
Total Current Assets |  |  | 205,607 |  |  |  | 224,584 |
Regulatory assets |  |  | 51,244 |  |  |  | 42,758 |
Pension and other postretirement benefit asset |  |  | 172,412 |  |  |  | 164,985 |
Other deferred assets and other |  |  | 18,243 |  |  |  | 17,817 |
Property, Plant, and Equipment: |  |  |  |  |  |
Property, plant, and equipment, net |  |  | 2,337,509 |  |  |  | 2,279,927 |
Construction work in progress |  |  | 372,628 |  |  |  | 292,969 |
Total Property, Plant, and Equipment |  |  | 2,710,137 |  |  |  | 2,572,896 |
Total Assets |  | $ | 3,157,643 |  |  | $ | 3,023,040 |
LIABILITIES AND CAPITALIZATION |  |  |  |  |  |
Current Liabilities: |  |  |  |  |  |
Long-term debt due within one year |  | $ | 20,509 |  |  | $ | 21,633 |
Short-term debt |  |  | 34,750 |  |  |  | 94,527 |
Accounts payable |  |  | 66,579 |  |  |  | 117,658 |
Accrued interest and taxes |  |  | 12,192 |  |  |  | 10,234 |
Accrued payroll related items |  |  | 15,742 |  |  |  | 17,244 |
Regulatory liabilities - current |  |  | 23,801 |  |  |  | 23,490 |
Other current liabilities |  |  | 11,798 |  |  |  | 8,843 |
Total Current Liabilities |  |  | 185,371 |  |  |  | 293,629 |
Other Credits: |  |  |  |  |  |
Deferred income taxes |  |  | 302,681 |  |  |  | 301,198 |
Investment tax credit - deferred |  |  | 61,466 |  |  |  | 48,609 |
Regulatory liabilities |  |  | 197,539 |  |  |  | 185,372 |
Accrued pension and other postretirement benefits |  |  | 51,452 |  |  |  | 51,105 |
Asset retirement obligations |  |  | 79,395 |  |  |  | 76,289 |
Other deferred liabilities and other |  |  | 68,108 |  |  |  | 67,281 |
Total Other Credits |  |  | 760,641 |  |  |  | 729,854 |
Capitalization: |  |  |  |  |  |
Common shareholder's equity |  |  | 1,172,654 |  |  |  | 1,050,564 |
Noncontrolling interest |  |  | 159,873 |  |  |  | 156,788 |
Total Equity |  |  | 1,332,527 |  |  |  | 1,207,352 |
Long-term debt |  |  | 879,104 |  |  |  | 792,205 |
Total Capitalization |  |  | 2,211,631 |  |  |  | 1,999,557 |
Commitments and contingencies (see Footnote 8) |  |  |  |  |  |
Total Liabilities and Capitalization |  | $ | 3,157,643 |  |  | $ | 3,023,040 |

The accompanying notes are an integral part of the above unaudited consolidated financial statements.

12

Madison Gas and Electric Company

Consolidated Statement s of Equity (unaudited)

(In thousands)

|  |  |  |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |  |  |
|  |  |  |  |  |  |  | Additional |  |  |  |  |  | Other |  |  | Non- |  |  |  |
|  | Common Stock |  |  | Paid-in |  |  | Retained |  |  | Comprehensive |  |  | Controlling |  |  |  |
|  | Shares |  |  | Value |  |  | Capital |  |  | Earnings |  |  | Income/(Loss) |  |  | Interest |  |  | Total |
Three Months Ended June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | 17,348 |  |  | $ | 17,348 |  |  | $ | 283,667 |  |  | $ | 709,108 |  |  | $ | — |  |  | $ | 151,985 |  |  | $ | 1,162,108 |
Net income |  |  |  |  |  |  |  |  |  |  |  | 18,761 |  |  |  |  |  |  | 5,714 |  |  |  | 24,475 |
Cash dividends paid to parent by MGE |  |  |  |  |  |  |  |  |  |  |  | (10,000 | ) |  |  |  |  |  |  |  |  | (10,000 | )
Distributions to parent from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,000 | ) |  |  | (4,000 | )
Ending Balance - June 30, 2025 |  |  | 17,348 |  |  | $ | 17,348 |  |  | $ | 283,667 |  |  | $ | 717,869 |  |  | $ | — |  |  | $ | 153,699 |  |  | $ | 1,172,583 |
Three Months Ended June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | 17,348 |  |  | $ | 17,348 |  |  | $ | 308,917 |  |  | $ | 763,156 |  |  | $ | — |  |  | $ | 158,144 |  |  | $ | 1,247,565 |
Net income |  |  |  |  |  |  |  |  |  |  |  | 22,483 |  |  |  |  |  |  | 5,729 |  |  |  | 28,212 |
Capital contributions from parent |  |  |  |  |  |  |  |  | 60,750 |  |  |  |  |  |  |  |  |  |  |  |  | 60,750 |
Distributions to parent from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,000 | ) |  |  | (4,000 | )
Ending Balance - June 30, 2026 |  |  | 17,348 |  |  | $ | 17,348 |  |  | $ | 369,667 |  |  | $ | 785,639 |  |  | $ | — |  |  | $ | 159,873 |  |  | $ | 1,332,527 |
Six Months Ended June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | 17,348 |  |  | $ | 17,348 |  |  | $ | 283,667 |  |  | $ | 688,404 |  |  | $ | — |  |  | $ | 150,386 |  |  | $ | 1,139,805 |
Net income |  |  |  |  |  |  |  |  |  |  |  | 52,965 |  |  |  |  |  |  | 11,313 |  |  |  | 64,278 |
Cash dividends paid to parent by MGE |  |  |  |  |  |  |  |  |  |  |  | (23,500 | ) |  |  |  |  |  |  |  |  | (23,500 | )
Distributions to parent from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,000 | ) |  |  | (8,000 | )
Ending Balance - June 30, 2025 |  |  | 17,348 |  |  | $ | 17,348 |  |  | $ | 283,667 |  |  | $ | 717,869 |  |  | $ | — |  |  | $ | 153,699 |  |  | $ | 1,172,583 |
Six Months Ended June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | 17,348 |  |  | $ | 17,348 |  |  | $ | 292,167 |  |  | $ | 741,049 |  |  | $ | — |  |  | $ | 156,788 |  |  | $ | 1,207,352 |
Net income |  |  |  |  |  |  |  |  |  |  |  | 62,590 |  |  |  |  |  |  | 11,335 |  |  |  | 73,925 |
Capital contributions from parent |  |  |  |  |  |  |  |  | 77,500 |  |  |  |  |  |  |  |  |  |  |  |  | 77,500 |
Cash dividends paid to parent by MGE |  |  |  |  |  |  |  |  |  |  |  | (18,000 | ) |  |  |  |  |  |  |  |  | (18,000 | )
Distributions to parent from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,250 | ) |  |  | (8,250 | )
Ending Balance - June 30, 2026 |  |  | 17,348 |  |  | $ | 17,348 |  |  | $ | 369,667 |  |  | $ | 785,639 |  |  | $ | — |  |  | $ | 159,873 |  |  | $ | 1,332,527 |

The accompanying notes are an integral part of the above unaudited consolidated financial statements.

13

MGE Energy, Inc., and Madi son Gas and Electric Company

Notes to Conso lidated Financial Statements (unaudited)

June 30, 2026

1.
Summary of Significa nt Accounting Policies – MGE Energy and MGE.

a.
Basis of Presentation.

This report is a combined report of MGE Energy and MGE. References in this report to "MGE Energy" are to MGE Energy, Inc. and its subsidiaries. References in this report to "MGE" are to Madison Gas and Electric Company.

MGE Power Elm Road and MGE Power West Campus own electric generating assets and lease those assets to MGE. Both entities are variable interest entities (VIE) under applicable authoritative accounting guidance. MGE is considered the primary beneficiary of these entities as a result of contractual agreements. As a result, MGE has consolidated MGE Power Elm Road and MGE Power West Campus in its financial reports. See Footnote 3 of the Notes to the Consolidated Financial Statements under Item 8, Financial Statements and Supplementary Data, of MGE Energy's and MGE's 2025 Annual Report on Form 10-K (the 2025 Annual Report on Form 10-K).

The accompanying consolidated financial statements as of June 30, 2026, and for the three and six months ended, as applicable, are unaudited but include all adjustments that MGE Energy and MGE management consider necessary for a fair statement of their respective financial statements. All adjustments are of a normal, recurring nature except as otherwise disclosed. The year-end consolidated balance sheet information was derived from the audited balance sheet appearing in the 2025 Annual Report on Form 10-K but does not include all disclosures required by accounting principles generally accepted in the United States of America. These notes should be read in conjunction with the financial statements and the notes thereto located on pages 52 through 105 of the 2025 Annual Report on Form 10-K.

b.
Supplemental Cash Flow Information – MGE Energy and MGE.

|  | MGE Energy |  | MGE(b)
|  | June 30, |  | June 30, |  | June 30, |  | June 30,
(In Thousands) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Income tax paid (receipts), net(a): |  |  |  |  |  |  |  |  |  |  |  |
US Federal |  | $ | (7,232) |  | $ | 3,681 |  | $ | (7,872) |  | $ | 3,351
US State and Local: |  |  |  |  |  |  |  |  |  |  |  |
Wisconsin |  |  | 3,800 |  |  | 5,000 |  |  | 3,620 |  |  | 4,980
Other |  |  | 91 |  |  | 66 |  |  | — |  |  | —
Significant noncash investing activities: |  |  |  |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  | 26,099 |  |  | 9,120 |  |  | 26,099 |  |  | 9,120

(a)
For the six months ended June 30, 2026, federal tax receipts include $9.5 million of proceeds from the transfer of federal tax credits under Internal Revenue Code Section 6418.
(b)
MGE Energy files a consolidated federal income tax return with its subsidiaries. While taxes are filed on a consolidated basis, MGE calculates its respective share of tax liability and makes intercompany tax payments to or from its parent company.

The following table presents the components of total cash, cash equivalents, and restricted cash on the consolidated balance sheets.

|  | MGE Energy |  | MGE
|  | June 30, |  | December 31, |  | June 30, |  | December 31,
(In thousands) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Cash and cash equivalents |  | $ | 16,621 |  | $ | 5,666 |  | $ | 10,737 |  | $ | 2,248
Restricted cash |  |  | 1,014 |  |  | 952 |  |  | 1,014 |  |  | 952
Receivable - margin account |  |  | 2,048 |  |  | 2,118 |  |  | 2,048 |  |  | 2,118
Cash, cash equivalents, and restricted cash |  | $ | 19,683 |  | $ | 8,736 |  | $ | 13,799 |  | $ | 5,318

Cash Equivalents

All highly liquid investments purchased with an original maturity of three months or less are considered to be cash equivalents.

14

Restricted Cash

MGE has certain cash accounts that are restricted to uses other than current operations and designated for a specific purpose. MGE's restricted cash accounts include cash held by trustees for certain employee benefits and cash deposits held by third parties. These are included in "Other current assets" on the consolidated balance sheets.

Receivable – Margin Account

Cash amounts held by counterparties as margin collateral for certain financial transactions are recorded as Receivable – margin account in "Other current assets" on the consolidated balance sheets. The costs being hedged are fuel for electric generation, purchased power, and cost of gas sold.

2.
New Ac counti ng Standards - MGE Energy and MGE.

In November 2024, the Financial Accounting Standards Board issued authoritative guidance within the codification's Income Statement - Reporting Comprehensive Income topic, which added disclosure requirements for the disaggregation of certain income statement expenses. The authoritative guidance will become effective for annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027. MGE will adopt the standard as of the effective date. The adoption of this standard will not have a material impact on MGE Energy's and MGE's financial statements.

In September 2025, the Financial Accounting Standards Board issued authoritative guidance within the codification’s Internal-Use Software topic, which amends certain aspects of the accounting for and disclosure of software costs. The authoritative guidance will become effective for annual reporting periods beginning after December 15, 2027, and interim periods within those annual reporting periods; early adoption is permitted as of the beginning of an annual reporting period. MGE will adopt the standard as of the effective date. The adoption of this standard is not expected to have a material impact on MGE Energy's and MGE’s financial statements.

In May 2026, the Financial Accounting Standards Board issued authoritative guidance within the codification’s Environmental Credits topic, which establishes a comprehensive model for the recognition, measurement, presentation, and disclosure of environmental credits and related obligations. The authoritative guidance will become effective for annual reporting periods beginning after December 15, 2027, and interim periods within those annual reporting periods; early adoption is permitted. MGE will adopt the standard as of the effective date. The adoption of this standard is not expected to have a material impact on MGE Energy's and MGE’s financial statements.

3.
Investme nt in ATC and ATC Holdco - MGE Energy and MGE.

ATC owns and operates electric transmission facilities primarily in Wisconsin. MGE received an interest in ATC when it, like other Wisconsin electric utilities, contributed its electric transmission facilities to ATC, as required by Wisconsin law. That interest is presently held by MGE Transco, a subsidiary of MGE Energy. ATC Holdco was formed by several members of ATC, including MGE Energy, to pursue electric transmission development and investments outside of Wisconsin. The ownership interest in ATC Holdco is held by MGEE Transco, a subsidiary of MGE Energy.

MGE Transco and MGEE Transco have accounted for their investments in ATC and ATC Holdco, respectively, under the equity method of accounting. Equity earnings from investments are recorded as "Other income" on the consolidated statements of income of MGE Energy. MGE Transco recorded the following amounts related to its investment in ATC:

|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
(In thousands) |  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Equity earnings from investment in ATC |  | $ | 3,776 |  |  | $ | 3,066 |  |  | $ | 7,298 |  |  | $ | 6,056 |
Dividends received from ATC |  |  | 2,788 |  |  |  | 2,345 |  |  |  | 5,450 |  |  |  | 5,632 |
Capital contributions to ATC |  |  | 2,156 |  |  |  | 2,679 |  |  |  | 6,616 |  |  |  | 5,171 |

15

In July 2026, MGE Transco made a $3.6 million capital contribution to ATC.

ATC's summarized financial data is as follows:

|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
(In thousands) |  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Operating revenues |  | $ | 274,048 |  |  | $ | 241,227 |  |  | $ | 539,307 |  |  | $ | 476,156 |
Operating expenses |  |  | (129,636 | ) |  |  | (117,564 | ) |  |  | (257,041 | ) |  |  | (234,309 | )
Other income, net |  |  | 1,228 |  |  |  | 550 |  |  |  | 1,928 |  |  |  | 633 |
Interest expense, net |  |  | (45,925 | ) |  |  | (43,254 | ) |  |  | (90,401 | ) |  |  | (82,447 | )
Earnings before members' income taxes |  | $ | 99,715 |  |  | $ | 80,959 |  |  | $ | 193,793 |  |  | $ | 160,033 |

MGE receives transmission and other related services from ATC. During the three and six months ended June 30, 2026, MGE recorded $11.2 million and $22.4 million, respectively, for transmission service compared to $10.2 million and $20.4 million for the comparable periods in 2025. MGE also provides a variety of operational, maintenance, and project management work for ATC, which is reimbursed by ATC. As of June 30, 2026, and December 31, 2025, MGE had a receivable due from ATC of $3.7 million and $2.5 million, respectively. The receivable is primarily related to transmission interconnection activities at the renewable generation sites. MGE will be reimbursed for these costs after the new generation assets are placed into service.

4.
Taxes - MGE E nergy and MGE.

Effective Tax Rate.

The effective income tax rates for the period, computed by dividing income tax expense by income before taxes, were as follows:

|  | MGE Energy |  | MGE
Effective income tax rate |  | 2026 |  | 2025 |  | 2026 |  | 2025
Three Months Ended June 30, |  |  | 11.4 |  | % |  |  | 10.1 |  | % |  |  | 9.8 |  | % |  |  | 8.4 |  | %
Six Months Ended June 30, |  |  | 11.0 |  | % |  |  | 12.0 |  | % |  |  | 9.4 |  | % |  |  | 10.5 |  | %

The effective tax rates were different than the federal statutory rate primarily due to state income taxes, net of the related federal tax benefit, federal production tax credits (PTC) and investment tax credits (ITC), the amortization of excess deferred taxes, and the impact of non-taxable income related to the equity portion of Allowance for Funds Used During Construction (AFUDC), net of depreciation. For both MGE Energy and MGE, the decrease in the effective tax rate for the six months ended June 30, 2026, compared to the prior year period was driven primarily by additional federal tax credits associated with renewable generation and energy storage projects, as well as increased non-taxable income related to the equity portion of AFUDC on projects under construction.

5.
Pensi on and Other Postretirement Plans - MGE Energy and MGE.

MGE maintains qualified and nonqualified pension plans, health care, and life insurance benefits and defined contribution 401(k) benefit plans for its employees and retirees.

The components of net periodic benefit cost, other than the service cost component, are recorded in "Other income, net" on the consolidated statements of income. The service cost component is recorded in "Other operations and maintenance" on the consolidated statements of income. MGE has regulatory treatment and recognizes regulatory assets or liabilities for timing differences between when net periodic benefit costs are recovered and when costs are recognized.

16

The following table presents the components of net periodic benefit costs recognized.

|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
(In thousands) |  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Pension Benefits |  |  |  |  |  |  |  |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 583 |  |  | $ | 655 |  |  | $ | 1,202 |  |  | $ | 1,306 |
Interest cost |  |  | 4,062 |  |  |  | 4,313 |  |  |  | 8,073 |  |  |  | 8,569 |
Expected return on assets |  |  | (7,790 | ) |  |  | (7,246 | ) |  |  | (15,526 | ) |  |  | (14,507 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  |  | 59 |  |  |  | 102 |  |  |  | 103 |  |  |  | 150 |
Net periodic benefit (credit) cost |  | $ | (3,086 | ) |  | $ | (2,176 | ) |  | $ | (6,148 | ) |  | $ | (4,482 | )
Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 177 |  |  | $ | 188 |  |  | $ | 352 |  |  | $ | 371 |
Interest cost |  |  | 677 |  |  |  | 754 |  |  |  | 1,359 |  |  |  | 1,514 |
Expected return on assets |  |  | (712 | ) |  |  | (634 | ) |  |  | (1,419 | ) |  |  | (1,358 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Transition obligation |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |
Actuarial gain |  |  | (208 | ) |  |  | (173 | ) |  |  | (389 | ) |  |  | (321 | )
Net periodic benefit (credit) cost |  | $ | (66 | ) |  | $ | 135 |  |  | $ | (97 | ) |  | $ | 207 |

As approved by the PSCW, MGE is allowed to defer differences between actual employee benefit plan costs and costs reflected in current rates. The deferred costs may be recovered or refunded in MGE's next rate filing. In 2026, MGE is refunding over-collected costs from previous years. During the three and six months ended June 30, 2025, MGE recovered $0.1 million and $0.7 million, respectively. These costs have not been reflected in the table above.

6.
Equity and Fi nancing Arrangements - MGE Energy.

a.
Stock Plan Share Issuances.

MGE Energy sells shares of its common stock through its Direct Stock Purchase and Dividend Reinvestment Plan (the Stock Plan). Those shares may be newly issued shares or shares that are purchased in the open market by an independent agent for participants in the Stock Plan. Sales of newly issued shares under the Stock Plan are covered by a shelf registration statement that MGE Energy filed with the SEC. During the six months ended June 30, 2026, and 2025, net proceeds from the Stock Plan were approximately $5.5 million and $3.8 million, respectively, which were used for general corporate purposes.

b.
At-the-Market Equity Offering.

In February 2026, MGE Energy filed a prospectus supplement under which it may sell shares of its common stock having an aggregate offering price of up to $100 million, through Guggenheim Securities, LLC, and Morgan Stanley & Co. LLC (each, a Manager) in negotiated transactions that are deemed to be an "at-the-market offering" (ATM). The ATM may be terminated by MGE Energy or, with respect only to itself, any Manager. Unless earlier terminated, the ATM shall automatically terminate on February 23, 2029, if MGE Energy does not file a new shelf registration statement relating to the shares to be sold under the ATM on or prior to such date. Each Manager will be entitled to compensation at a commission equal to up to 2.0% of the gross offering proceeds of the shares of common stock sold under the ATM. MGE Energy expects to use the net proceeds from any issuance of common stock for general corporate purposes, including repayment of short-term debt, funding capital expenditures, and investments in subsidiaries. As of June 30, 2026, MGE Energy sold an aggregate of 154,321 shares of its common stock under the ATM for aggregate net proceeds of $11.5 million and $0.2 million in transaction fees paid.

c.
Common Stock Public Offering and Forward Equity Sale Agreements.

On May 6, 2026, MGE Energy completed a registered public offering of 3,300,331 shares of its common stock at a public offering price of $75.75 per share, for aggregate gross proceeds of approximately $250 million. Of the shares offered,

17

990,099 shares were issued and sold by MGE Energy, resulting in net proceeds of approximately $72.2 million after underwriting discounts and commissions. The remaining 2,310,232 shares were sold to Morgan Stanley & Co. LLC, Bank of America, N.A., and JPMorgan Chase Bank, National Association or their respective affiliates pursuant to separate forward sale agreements entered into by MGE Energy with each of these counterparties. Under the forward sale agreements, MGE Energy has the right to elect physical settlement, cash settlement, or net share settlement, in whole or in part, through January 2028, and the agreements are classified as equity instruments. Based on the initial forward sale price of $72.9094 per share, MGE Energy expects to receive net proceeds of approximately $168.4 million upon full physical settlement of the forward sale agreements, subject to adjustments specified in such agreements. MGE Energy intends to use the net proceeds from the offering and any future settlement of the forward sale agreements for general corporate purposes, which may include repayment of short-term debt, repurchase, retirement or refinancing of other securities, funding capital expenditures, and investments in subsidiaries.

d.
Changes in Common Shares Outstanding.

The share issuances discussed above, together with shares issued pursuant to stock-based compensation arrangements, resulted in the following changes in outstanding common stock:

|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2026 |  | 2025 |  | 2026 |  | 2025
Common stock shares outstanding at beginning of period |  | 36,753,208 |  | 36,536,628 |  | 36,541,849 |  | 36,489,641
Shares issued: |  |  |  |  |  |  |  |
At-the-market offering program |  | — |  | — |  | 154,321 |  | —
Stock-based compensation |  | — |  | — |  | 22,050 |  | 11,213
Stock plan |  | 37,444 |  | 5,221 |  | 72,432 |  | 40,995
Public offering |  | 990,099 |  | — |  | 990,099 |  | —
Common stock shares outstanding at end of period |  | 37,780,751 |  | 36,541,849 |  | 37,780,751 |  | 36,541,849

e.
E arnings Per Share.

Basic earnings per share is calculated by dividing net income attributable to MGE Energy by the weighted-average number of MGE Energy's common shares outstanding during the period. In the calculation of diluted earnings per share, weighted-average shares outstanding are increased for additional shares that would be outstanding if potentially dilutive securities were converted to common stock. Potentially dilutive securities for MGE Energy consist of restricted stock units and shares under the forward equity sale agreements, as discussed above.

|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(In thousands) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Net income attributed to common shareholders |  | 33,353 |  | 26,498 |  | 81,834 |  | 68,090
Weighted average common shares outstanding - basic |  | 37,351 |  | 36,540 |  | 36,972 |  | 36,526
Effect of dilutive securities: |  |  |  |  |  |  |  |
Dilutive effect of stock-based compensation awards |  | 43 |  | 29 |  | 26 |  | 31
Dilutive effect of forward equity sale agreement |  | 62 |  | — |  | 31 |  | —
Weighted average common shares outstanding - diluted |  | 37,456 |  | 36,569 |  | 37,029 |  | 36,557
Basic earnings per share |  | $0.89 |  | $0.73 |  | $2.21 |  | $1.86
Diluted earnings per share |  | $0.89 |  | $0.72 |  | $2.21 |  | $1.86

7.
Share-Based C ompensation - MGE Energy and MGE.

During the three and six months ended June 30, 2026, MGE recorded $1.6 million and $2.7 million, respectively, in compensation expense related to share-based compensation awards compared to $0.5 million and $1.7 million, respectively, for the comparable periods in 2025.

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In the first quarter of 2026, participants received cash payments totaling $1.7 million and 22,050 shares of common stock upon settlement of awards granted in 2023 to employees and non-employee directors, and in 2025 to non-employee directors, under the 2021 Incentive Plan.

In March 2026, MGE granted 24,879 performance units and 34,230 restricted stock units under the 2021 Incentive Plan to eligible employees and non-employee directors. In April 2026, MGE granted 25,000 restricted stock units under the 2021 Incentive Plan to eligible employees.

Share-based compensation expense is recognized on a straight-line basis over the requisite service period. Awards classified as equity awards are measured based on their grant-date fair value. Awards classified as liability awards are recorded at fair value each reporting period. The performance units can be paid out in cash, shares of common stock, or a combination of cash and stock and are classified as a liability award. The restricted stock units will be paid out in shares of common stock and therefore are classified as equity awards.

8.
Commitmen ts and Contingencies - MGE Energy and MGE.

a.
Environmental.

MGE Energy and MGE are subject to frequently changing local, state, and federal regulations concerning air quality, water quality, land use, threatened and endangered species, hazardous materials handling, and solid waste disposal. These regulations affect how we conduct operations and may affect both operating costs and capital expenditures. Several of these environmental rules are subject to legal challenges, reconsideration and/or other uncertainties. Regulatory initiatives, proposed rules, and court challenges to adopted rules could have the potential to have a material effect on capital expenditures and operating costs. Management believes compliance costs will be recovered in future rates based on previous treatment of environmental compliance projects.

These initiatives, proposed rules, and court challenges include:

•
The United States Environmental Protection Agency's (EPA) promulgated water Effluent Limitations Guidelines (ELG) and standards for steam electric power plants that focus on the reduction of metals and other pollutants in wastewater from new and existing power plants.

With the closure of the wet pond system in 2023, Columbia complies with ELG requirements. With the installation of additional wastewater treatment equipment completed in 2023, the Elm Road Units comply with ELG requirements.

In May 2024, the EPA finalized the Supplemental Effluent Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category (2024 ELG Rule) that further regulates the wastewater discharges associated with coal-fired power plants. The rule impacts Columbia and the Elm Road Units. The 2024 ELG Rule focuses on wastewater discharges from flue gas desulfurization, combustion residual leachate, and bottom ash transport water. The 2024 ELG Rule includes reduced requirements for plants that have already installed pollution controls based on previous versions of the rule, and for plants that will be retiring or switching to natural gas by certain dates. Although the 2024 ELG Rule is currently being challenged in federal court, the litigation is on hold while the EPA undertakes a reconsideration process. The 2024 ELG Rule builds upon the 2020 ELG Rule, which also remains under legal challenge and is similarly on hold pending the outcome of the EPA's review. In December 2025, the EPA published a rule (2025 Rule) that extended several rule deadlines. This rule is also under legal challenge. The operator of the Elm Road Units is in compliance with the 2024 ELG Rule. The operator of Columbia has indicated they are in compliance with the 2024 ELG Rule. MGE will continue to monitor the outcomes of the rule challenges and work with our co-owners on their compliance plans.

•
The EPA's cooling water intake rules require that cooling water intake structures at electric power plants meet best technology available (BTA) standards to reduce the mortality from entrainment (drawing aquatic life into a plant's cooling system) and impingement (trapping aquatic life on screens of cooling water intake structures).

Blount received its most recent Wisconsin Pollutant Discharge Elimination System (WPDES) permit from the Wisconsin Department of Natural Resources (WDNR) in October 2023. Blount's latest WPDES permit assumes that the plant meets BTA standards for entrainment for the duration of this permit which expires in 2028. The WDNR included a requirement to conduct an optimization study to demonstrate compliance with impingement BTA

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standards in the latest permit which needs to be completed by January 2028. Once the WDNR determines the impingement requirements at Blount, MGE will be able to determine any compliance costs of meeting Blount's permit requirements.

Intakes at Columbia are subject to this rule. In March 2026, Columbia received an updated WPDES permit from the WDNR. The WPDES permit indicates that Columbia's existing intake structure meets BTA standards. MGE does not, based on current information, anticipate any further requirements at Columbia and thus does not expect this rule to have a material effect on Columbia.

•
The Clean Air Act set new source performance standards and emission guidelines for greenhouse gas (GHG) emissions from fossil fuel-fired electric generating units. These regulations apply to existing, new, and modified units and guide states in developing their emission control plans.

In May 2024, the EPA published its final performance standards and emission guidelines under Section 111(b) of the Clean Air Act for carbon dioxide emissions from new combustion turbines and existing fossil fuel-fired boilers used to produce electricity. The final rule granted some emissions flexibility for existing coal-fired units that retire and/or fuel switch by certain dates. For existing natural gas boiler units, the final rule established a process where states must submit plans to the EPA for establishing standards. States had two years from the publication date of these rules to submit plans to the EPA for review and approval. Preliminary evaluation of the final ruling showed that MGE met the requirements for the gas-fired boilers at Blount. Evaluations done by the owners of Columbia and the Elm Road Units in 2024 indicated that they have a plan for complying with the May 2024 rule. In June 2025, the EPA published a proposed rule with two potential options: (1) repeal the performance standards and emission guidelines under Section 111 of the Clean Air Act associated with GHG emissions from fossil fuel-fired power plants, or (2) retain only the efficiency-based requirements for new natural gas-fired power plants and repeal all other aspects of the rule. In July 2025, the EPA released a new proposed rule titled "Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards." In February 2026, the EPA finalized the repeal, which will effectively undo the basis for federal regulation of GHG under the Clean Air Act. Several states and stakeholders have initiated legal challenges to the repeal. The scope and timing of any impacts on federal GHG regulation remain uncertain pending litigation and potential further agency action. MGE will continue to monitor developments.

•
The EPA's rule to regulate ambient levels of ozone through the 2015 Ozone National Ambient Air Quality Standards (NAAQS).

The Elm Road Units are located in Milwaukee County, Wisconsin, a nonattainment area for the 2015 Ozone NAAQS. The area was redesignated to serious nonattainment by the EPA in December 2024, effective January 2025, but is currently categorized as moderate nonattainment following a stay granted by the U.S. Court of Appeals for the Seventh Circuit in September 2025. At this time, the operator of the Elm Road Units does not expect that the 2015 Ozone NAAQS or the Milwaukee County nonattainment designation will have a direct material effect on the Elm Road Units.

•
The EPA's rule to regulate Fine Particulate Matter (PM2.5).

In March 2024, the EPA published a final rule to lower the average annual PM2.5 NAAQS from 12 ug/m3 to 9 ug/m3 effective May 2024.

Multiple states and industry groups challenged the March 2024 PM2.5 NAAQS rule in the United States Court of Appeals for the District of Columbia Circuit. In February 2025, Wisconsin's Governor Evers submitted a state-wide attainment recommendation to the EPA. In June 2026, the United States Court of Appeals for the District of Columbia Circuit denied the petitions for review. As a result, absent further judicial relief, EPA action, or other legal developments, the annual PM2.5 standard of 9 µg/m3 remains in effect.

The new annual PM2.5 NAAQS could impact Milwaukee County, where the Elm Road Units are located, if the county is determined to be in nonattainment. A nonattainment designation would require the State of Wisconsin to develop a plan to get into attainment, which would likely include additional limitations for new and modified plants in the county. The final impact of this rule will not be known until the EPA determines the attainment status of Wisconsin

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counties and the State of Wisconsin develops an attainment implementation plan. MGE will continue to follow the rule's developments.

•
Rules regulating nitrogen oxide (NO x) and sulfur dioxide (SO 2) emissions, including the Good Neighbor Plan and Clean Air Visibility Rule.

The EPA's Good Neighbor Plan and its progeny are a suite of interstate air pollution transport rules designed to reduce ozone and PM2.5 ambient air levels in areas that the EPA has determined as being significantly impacted by pollution from upwind states. This is accomplished through a reduction in NO x and SO 2 from qualifying fossil fuel-fired power plants and industrial boilers in upwind "contributing" states. NO x and SO 2 contribute to fine particulate pollution, and NO x contributes to ozone formation in downwind areas. Reductions are generally achieved through a cap-and-trade system. Individual plants can meet their caps through reducing emissions and/or buying allowances on the market.

In March 2023 (published June 2023), the EPA finalized its Federal Implementation Plan to address state obligations under the Clean Air Act "good neighbor" provisions for the 2015 Ozone NAAQS (Good Neighbor Plan). The Good Neighbor Plan impacts 23 states, including Wisconsin. For Wisconsin, the Good Neighbor Plan includes revisions to the current obligations for fossil-fuel power generation, which includes Blount, Columbia, the Elm Road Units, WCCF, West Riverside, and West Marinette. Initial obligations under the Federal Implementation Plan were scheduled to begin during the 2023 ozone season. In 2026, additional obligations would go into effect, including a further reduction in emissions budgets. Wisconsin would need to submit a State Implementation Plan to meet its obligations or accept the EPA's Good Neighbor Plan.

Multiple legal challenges to the Good Neighbor Plan and related state implementation plan disapprovals are pending, including in the United States Court of Appeals for the District of Columbia. In June 2024, the Supreme Court of the United States granted a request to stay the Good Neighbor Plan and block its enforcement pending judicial review by the U.S. Court of Appeals for the District of Columbia on the merits of petitioner's challenges to implementation of the rule. The EPA has temporarily halted the enforcement of the Good Neighbor Plan's requirements for all pollution sources in states affected by the plan, including Wisconsin. While the EPA addresses these concerns, interim rules have been implemented in Wisconsin to address interstate pollution. Based on MGE's current evaluation, if the Good Neighbor Plan goes into effect as-is, the 2026 additional emission reductions may impact the Elm Road Units. However, the final impact of the rules will not be known until judicial reviews are completed and/or the EPA takes further action regarding the rule.

•
The EPA's Coal Combustion Residuals (CCR) Rule.

The CCR Rule regulates the disposal of solid waste coal ash and defines what ash use activities would be considered generally exempt beneficial reuse of coal ash. The CCR Rule also regulates landfills, ash ponds, and other surface impoundments used for coal combustion residuals by regulating their design, location, monitoring, and operation. The CCR Rule requires owners and operators of coal-fired power plants to stop transporting CCR and non-CCR wastewater to unlined surface impoundments. At Columbia, the coal combustion residuals system completed in 2023 replaced the unlined surface impoundment, and Columbia complies with this rule.

Review of the Elm Road Units has indicated that the costs to comply with the CCR Rule are not expected to be significant.

In May 2024, the EPA published its final CCR Legacy Rule. The CCR Legacy Rule applies to previously closed disposal sites. In 2024, MGE recorded an asset retirement obligation for its estimated share of the legal liability associated with the effect of the CCR Legacy Rule for remediation and groundwater compliance monitoring at Columbia. Actual costs of compliance may be different than the amount recorded due to potential changes in compliance strategies that will be used, as well as other potential changes in cost estimate.

In February 2026, the EPA finalized the CCR Management Unit Deadline Extension Rule, which provides a one-year extension for the submission of Facility Evaluation Reports and extends the deadline for the implementation of groundwater monitoring systems at legacy CCR management units to February 2031. Columbia continues to evaluate the impact of this extension on its compliance timeline. This update is not expected to materially affect anticipated

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compliance costs. In April 2026, the EPA published a proposed rule that would amend the CCR regulations by eliminating certain closure requirements that previously applied to legacy surface impoundments and CCR management units. MGE will continue to monitor legal developments and any future updates to this rule.

b.
Legal Matters.

MGE is involved in various legal matters that are being defended and handled in the normal course of business. MGE accrues for costs that are probable of being incurred and subject to reasonable estimation. The accrued amount for these matters is not material to the financial statements. MGE does not expect the resolution of these matters to have a material adverse effect on its consolidated results of operations, financial condition, or cash flows.

c.
Purchase Contracts.

MGE Energy and MGE have entered into various commodity supply, transportation, and storage contracts to meet their obligations to deliver electricity and natural gas to customers. Management expects to recover these costs in future customer rates. The following table shows future minimum commitments related to purchase contracts as of June 30, 2026:

(In thousands) |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 |  |  | 2030 |  |  | Thereafter |
Coal(a) |  | $ | 19,327 |  |  | $ | 12,157 |  |  | $ | 7,927 |  |  | $ | — |  |  | $ | — |  |  | $ | — |

(a)
Total coal commitments for MGE's share of the Columbia and Elm Road Units, including transportation. Fuel procurement for MGE's jointly owned Columbia and Elm Road Units is handled by Wisconsin Power and Light Company and WEPCO, respectively, who are the operators of those facilities.
9.
Rate Mat ters - MGE Energy and MGE.
a.
Rate Proceedings.

|  | Rate increase |  | Return on Common Equity |  | Common Equity Component of Regulatory Capital Structure |  | Effective Date
Approved 2024/2025 rate proceeding(a)(b) |  |  |  |  |  |  |  |
Electric(c) |  | 2.63% |  | 9.7% |  | 56.1% |  | 1/1/2025
Gas |  | 1.32% |  | 9.7% |  | 56.1% |  | 1/1/2025
Approved 2026/2027 settlement(b)(d) |  |  |  |  |  |  |  |
Electric |  | 0.15% |  | 9.8% |  | 56.1% |  | 1/1/2026
Gas |  | 2.77% |  | 9.8% |  | 56.1% |  | 1/1/2026
Electric |  | 3.63% |  | 9.8% |  | 56.1% |  | 1/1/2027
Gas |  | 2.04% |  | 9.8% |  | 56.1% |  | 1/1/2027

(a)
The electric rate increase was driven by an increase in rate base including our investments made in West Riverside, local solar, continued investment in grid modernization, as well as higher costs for transmission, pension and other post retirement benefits, and uncollectible costs (including costs previously deferred from prior years). This increase in electric costs is offset by a decrease in fuel costs and benefit from lower tax expense (including impacts from the Inflation Reduction Act). MGE filed an updated 2025 fuel forecast with the PSCW in 2024, which impacted rates in 2025, based on any variance between the forecast submitted as part of the rates and updated forecast. In addition, the PSCW authorized MGE to defer a recovery of and a return on costs associated for any change in the in-service date for Paris and force majeure costs for Badger Hollow II and Paris that were not reflected in this rate filing. The PSCW also approved deferral of any differential in PTC tax credits reflected in rates and actual credits produced. These deferrals will be reflected in MGE's next rate case filing. The gas rate increases were also driven by our investment made in grid modernization and higher pension and other post retirement benefits and uncollectible costs (including costs previously deferred from prior years). This increase in gas costs is offset by a tax benefit related to excess deferred taxes. Included in the gas residential rate is a reduction in the customer fixed charge.
(b)
Includes an earnings sharing mechanism, under which, if MGE earns above the authorized Return on Equity (ROE) in the rate order: (i) the utility will retain 100.0% of earnings for the first 15 basis points above the authorized ROE; (ii) 50.0% of the next 60 basis points will be required to be deferred and returned to customers; and (iii) 100.0% of any remaining excess earnings will be required to be refunded to customers. The earnings calculation excludes fuel rules adjustments. See "Fuel Rules" below.
(c)
The PSCW approved a 2025 Fuel Cost Plan in December 2024. The plan lowered the 2025 increase in electric rates to 2.63% to reflect lower expected fuel costs.
(d)
The electric rate increase reflects growth in rate base, primarily from investments in solar and battery projects, West Riverside, and continued investment in grid modernization, as well as higher costs for transmission. The increase in electric costs is offset by a decrease in fuel costs, changes in pension and other post retirement benefits, updated depreciation rates, and benefit from lower tax expense (including impacts from the Inflation Reduction Act). MGE filed a 2027 Fuel Cost Plan with the PSCW in June 2026. The gas increase is driven by an increase in rate base including continued distribution infrastructure improvements designed to enhance reliability and safety and system modernization, and updated depreciation

22

rates. The increase in gas costs is offset by changes in pension and other post retirement benefits. MGE expects a final decision from the PSCW on the Fuel Cost Plan by the end of 2026.
b.
Fu el Rules.

Fuel rules require Wisconsin utilities to defer electric fuel-related costs that fall outside a symmetrical cost tolerance band around the amount approved for a utility in its annual fuel proceedings. Any over- or under-recovery of the actual costs is determined in the following year and is then reflected in future billings to electric retail customers. The fuel rules bandwidth is set at plus or minus 2% in 2026 and 2025. The electric fuel-related costs are subject to an excess revenues test. Excess revenues are defined as revenues in the year in question that provide MGE with a greater return on common equity than authorized by the PSCW in MGE's latest rate order. The recovery of under-collected electric fuel-related costs would be reduced by the amount that exceeds the excess revenue test. These costs are subject to the PSCW's annual review of fuel costs completed in the year following the deferral. The following table summarizes deferred electric fuel-related costs:

|  | Fuel Costs (Savings) (in millions) |  | Refund or Recovery Period
2024 |  | ($3.0)(a) |  | October 2025
2025 |  | ($7.1)(a) |  | October 2026
2026 |  | ($6.7) |  | (b)

(a)
There was no change to the refund or recovery in the fuel rules proceedings from the amount MGE deferred.
(b)
These costs (savings) will be subject to the PSCW's annual review of 2026 fuel costs, expected to be completed in 2027.

10.
Derivati ve and Hedging Instruments - MGE Energy and MGE.
a.
Purpose.

As part of its regular operations, MGE enters into contracts, including options, swaps, futures, forwards, and other contractual commitments, to manage its exposure to commodity prices. To the extent that these contracts are derivatives, MGE assesses whether or not the normal purchases or normal sales exclusion applies. For contracts to which this exclusion cannot be applied, the derivatives are recognized in the consolidated balance sheets at fair value. MGE's financial commodity derivative activities are conducted in accordance with its electric and gas risk management program, which is approved by the PSCW and limits the volume MGE can hedge with specific risk management strategies. The maximum length of time over which cash flows related to energy commodities can be hedged is four years. If the derivative qualifies for regulatory deferral, the derivatives are marked to fair value and are offset with a corresponding regulatory asset or liability depending on whether the derivative is in a net loss or net gain position, respectively. The deferred gain or loss is recognized in earnings in the delivery month applicable to the instrument. Gains and losses related to hedges qualifying for regulatory treatment are refundable or recoverable in gas rates through the Purchased Gas Adjustment (PGA) or in electric rates as a component of the fuel rules mechanism.

b.
Notional Amounts.

The gross notional volume of open derivatives is as follows:

|  | June 30, 2026 |  | December 31, 2025
Commodity derivative contracts |  |  | 195,080 |  |  | MWh |  |  | 224,360 |  |  | MWh
Commodity derivative contracts |  |  | 7,330,000 |  |  | Dth |  |  | 8,230,000 |  |  | Dth
FTRs |  |  | 5,424 |  |  | MW |  |  | 2,413 |  |  | MW

c.
Financial Statement Presentation.

MGE purchases and sells exchange-traded and over-the-counter options, swaps, and futures contracts. These arrangements are primarily entered into to help stabilize the price risk associated with gas or power purchases. These transactions are employed by both MGE's gas and electric segments. Additionally, as a result of the firm transmission agreements that MGE holds on electricity transmission paths in the MISO market, MGE holds financial transmission rights (FTRs). An FTR is a financial instrument that entitles the holder to a stream of revenues or charges based on the differences in hourly day-ahead energy prices between two points on the transmission grid. The fair values of these instruments are offset with a corresponding regulatory asset/liability depending on whether the instruments are in a net loss/gain position. Depending on the nature of the instrument, the gain or loss associated with these transactions will be reflected as cost of gas sold, fuel for electric generation, or purchased power expense in the delivery month applicable to

23

the instrument. As of June 30, 2026, and December 31, 2025, the cost basis of exchange traded derivatives and FTRs exceeded their fair value by $0.8 million and $1.4 million, respectively.

The following table summarizes the fair value of the derivative instruments on the consolidated balance sheets. All derivative instruments in this table are presented on a gross basis and are calculated prior to the netting of instruments with the same counterparty under a master netting agreement as well as the netting of collateral. For financial statement purposes, instruments are netted with the same counterparty under a master netting agreement as well as the netting of collateral.

|  | Derivative |  |  | Derivative |  |  |
(In thousands) |  | Assets |  |  | Liabilities |  |  | Balance Sheet Location
June 30, 2026 |  |  |  |  |  |  |  |
Commodity derivative contracts(a) |  | $ | 1,177 |  |  | $ | 1,399 |  |  | Other current liabilities
Commodity derivative contracts(a) |  |  | 199 |  |  |  | 139 |  |  | Other deferred liabilities and other
FTRs(a) |  |  | — |  |  |  | 630 |  |  | Other current liabilities
December 31, 2025 |  |  |  |  |  |  |  |
Commodity derivative contracts(a) |  | $ | 448 |  |  | $ | 2,380 |  |  | Other current liabilities
Commodity derivative contracts(a) |  |  | 366 |  |  |  | 185 |  |  | Other deferred liabilities and other
FTRs |  |  | 337 |  |  |  | — |  |  | Other current assets

(a)
As of June 30, 2026, and December 31, 2025, collateral of $0.8 million and $1.8 million, respectively, was posted against and netted with derivative liability positions. The fair value of the derivatives disclosed in this table has not been adjusted for the collateral posted.

The following table shows the effect of netting arrangements for recognized derivative assets and liabilities that are subject to a master netting arrangement or similar arrangement on the consolidated balance sheets.

Offsetting of Derivative Assets and Liabilities

(In thousands) |  | Gross Amounts |  |  | Gross Amounts Offset in Balance Sheets |  |  | Collateral Posted Against Derivative Positions |  |  | Net Amount Presented in Balance Sheets |
June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  | $ | 1,376 |  |  | $ | (1,376 | ) |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
FTRs |  |  | 630 |  |  |  | — |  |  |  | (630 | ) |  |  | — |
Commodity derivative contracts |  |  | 1,538 |  |  |  | (1,376 | ) |  |  | (162 | ) |  |  | — |
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  | $ | 814 |  |  | $ | (814 | ) |  | $ | — |  |  | $ | — |
FTRs |  |  | 337 |  |  |  | — |  |  |  | — |  |  |  | 337 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  |  | 2,565 |  |  |  | (814 | ) |  |  | (1,751 | ) |  |  | — |

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The following tables summarize the unrealized and realized gains (losses) related to the derivative instruments on the consolidated balance sheets and the consolidated statements of income.

|  | 2026 |  |  | 2025 |
(In thousands) |  | Current and Long-Term Regulatory Asset (Liability) |  |  | Other Current Assets |  |  | Current and Long-Term Regulatory Asset (Liability) |  |  | Other Current Assets |
Three Months Ended June 30: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss |  |  | 1,680 |  |  |  | — |  |  |  | 2,118 |  |  |  | — |
Realized (loss) gain reclassified to a deferred account |  |  | (245 | ) |  |  | 245 |  |  |  | (288 | ) |  |  | 288 |
Realized (loss) gain reclassified to income statement |  |  | (567 | ) |  |  | (54 | ) |  |  | (667 | ) |  |  | 30 |
Six Months Ended June 30: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (gain) loss |  | $ | (3,753 | ) |  | $ | — |  |  | $ | 362 |  |  | $ | — |
Realized gain (loss) reclassified to a deferred account |  |  | 2,363 |  |  |  | (2,363 | ) |  |  | 263 |  |  |  | (263 | )
Realized gain (loss) reclassified to income statement |  |  | 768 |  |  |  | 2,261 |  |  |  | (1,262 | ) |  |  | 271 |

|  | Realized Losses (Gains) |
|  | 2026 |  |  | 2025 |
(In thousands) |  | Fuel for Electric Generation/ Purchased Power |  |  | Cost of Gas Sold |  |  | Fuel for Electric Generation/ Purchased Power |  |  | Cost of Gas Sold |
Three Months Ended June 30: |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  | $ | 306 |  |  | $ | — |  |  | $ | 198 |  |  | $ | — |
FTRs |  |  | 315 |  |  |  | — |  |  |  | 439 |  |  |  | — |
Six Months Ended June 30: |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  | $ | (566 | ) |  | $ | (2,231 | ) |  | $ | 596 |  |  | $ | (203 | )
FTRs |  |  | (232 | ) |  |  | — |  |  |  | 598 |  |  |  | — |

MGE's commodity derivative contracts and FTRs are subject to regulatory deferral. These derivatives are marked to fair value and are offset with a corresponding regulatory asset or liability. Realized gains and losses are deferred on the consolidated balance sheets and are recognized in earnings in the delivery month applicable to the instrument. As a result of the treatment described above, there are no unrealized gains or losses that flow through earnings.

Certain counterparties extend MGE a credit limit. If MGE exceeds these limits, the counterparties may require collateral to be posted. As of both June 30, 2026, and December 31, 2025, no counterparties were in a net liability position.

Nonperformance of counterparties to the non-exchange traded derivatives could expose MGE to credit loss. However, MGE enters into transactions only with companies that meet or exceed strict credit guidelines, and it monitors these counterparties on an ongoing basis to mitigate nonperformance risk in its portfolio. As of June 30, 2026, no counterparties had defaulted.

11.
Fair Value of Fin ancial Instruments - MGE Energy and MGE.

Fair value is defined as the price that would be received to sell an asset or would be paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. The accounting standard clarifies that fair value should be based on the assumptions market participants would use when pricing the asset or liability including assumptions about risk. The standard also establishes a three-level fair value hierarchy based upon the observability of the assumptions used and requires the use of observable market data when available. The levels are:

Level 1 - Pricing inputs are quoted prices within active markets for identical assets or liabilities.

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Level 2 - Pricing inputs are quoted prices within active markets for similar assets or liabilities; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations that are correlated with or otherwise verifiable by observable market data.

Level 3 - Pricing inputs are unobservable and reflect management's best estimate of what market participants would use in pricing the asset or liability.

a.
Fair Value of Financial Assets and Liabilities Recorded at the Carrying Amount.

The carrying amount of cash, cash equivalents, and outstanding commercial paper approximates fair market value due to the short maturity of those investments and obligations. The estimated fair market value of long-term debt is based on quoted market prices for similar financial instruments. Since long-term debt is not traded in an active market, it is classified as Level 2. The estimated fair market value of the financial instruments are as follows:

|  | June 30, 2026 |  |  | December 31, 2025 |
(In thousands) |  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Long-term debt(a) |  | $ | 904,217 |  |  | $ | 850,628 |  |  | $ | 818,115 |  |  | $ | 768,889 |

(a)
Includes long-term debt due within one year. Excludes debt issuance costs and unamortized discount of $4.6 million and $4.3 million as of June 30, 2026, and December 31, 2025, respectively.
b.
Recurring Fair Value Measurements.

The following table presents the balances of assets and liabilities measured at fair value on a recurring basis for both MGE and MGE Energy.

|  | Fair Value as of June 30, 2026 |
(In thousands) |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, net(a) |  | $ | 1,376 |  |  | $ | 849 |  |  | $ | — |  |  | $ | 527 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, net(a) |  | $ | 2,168 |  |  | $ | 1,432 |  |  | $ | — |  |  | $ | 736 |
Deferred compensation |  |  | 7,457 |  |  |  | — |  |  |  | 7,457 |  |  |  | — |
Total Liabilities |  | $ | 9,625 |  |  | $ | 1,432 |  |  | $ | 7,457 |  |  | $ | 736 |

|  | Fair Value as of December 31, 2025 |
(In thousands) |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, net(a) |  | $ | 1,151 |  |  | $ | 568 |  |  | $ | — |  |  | $ | 583 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, net(a) |  | $ | 2,565 |  |  | $ | 1,331 |  |  | $ | — |  |  | $ | 1,234 |
Deferred compensation |  |  | 7,172 |  |  |  | — |  |  |  | 7,172 |  |  |  | — |
Total Liabilities |  | $ | 9,737 |  |  | $ | 1,331 |  |  | $ | 7,172 |  |  | $ | 1,234 |

(a)
As of June 30, 2026, and December 31, 2025, collateral of $0.8 million and $1.8 million, respectively, was posted against and netted with derivative liability positions. The fair value of the derivatives disclosed in this table has not been adjusted for the collateral posted.

E xchange-traded Investments. Investments include exchange-traded investment securities valued using quoted prices on active exchanges and are therefore classified as Level 1.

Deferred Compensation. The deferred compensation plans allow participants to defer certain cash compensation into notional investment accounts. These amounts are included within "Other deferred liabilities and other" in the consolidated balance sheets. The value of certain deferred compensation obligations is based on the market value of the participants' notional investment accounts. The underlying notional investments are comprised primarily of equities, mutual funds, and fixed income securities that are based on directly and indirectly observable market prices. Since the deferred compensation obligations themselves are not exchanged in an active market, they are classified as Level 2.

The value of legacy deferred compensation obligations is based on notional investments that earn interest based upon the semiannual rate of U.S. Treasury Bills having a 26-week maturity increased by 1% compounded monthly with a

26

minimum annual rate of 7%, compounded monthly. The notional investments are based upon observable market data, however, since the deferred compensation obligations themselves are not exchanged in an active market, they are classified as Level 2.

Derivatives. Derivatives include exchange-traded derivative contracts, over-the-counter transactions, and FTRs. Most exchange-traded derivative contracts are valued based on unadjusted quoted prices in active markets and are therefore classified as Level 1. A small number of exchange-traded derivative contracts are valued using quoted market pricing in markets with insufficient volumes and are therefore considered unobservable and classified as Level 3. Transactions done with an over-the-counter party are on inactive markets and are therefore classified as Level 3. These transactions are valued based on quoted prices from markets with similar exchange-traded transactions. FTRs are priced based upon monthly auction results for identical or similar instruments in a closed market with limited data available and are therefore classified as Level 3.

The following table summarizes the changes in Level 3 commodity derivative assets and liabilities measured at fair value on a recurring basis.

|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(In thousands) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Realized and unrealized gains (losses): |  |  |  |  |  |  |  |  |  |  |  |
Included in regulatory assets |  |  | (284) |  |  | — |  |  | 442 |  |  | —
Included in regulatory liability |  |  | — |  |  | (318) |  | $ | — |  | $ | 642
Included in earnings |  |  | (564) |  |  | (665) |  |  | 817 |  |  | (1,262)
Settlements |  |  | 564 |  |  | 665 |  |  | (817) |  |  | 1,264

The following table presents total realized and unrealized gains (losses) included in income for Level 3 assets and liabilities measured at fair value on a recurring basis(b).

|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(In thousands) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Purchased power expense |  | $ | (564) |  | $ | (665) |  | $ | 817 |  | $ | (1,262)

(b)
MGE's exchange-traded derivative contracts, over-the-counter party transactions, purchased power agreement, and FTRs are subject to regulatory deferral. These derivatives are therefore marked to fair value and are offset in the financial statements with a corresponding regulatory asset or liability.

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12.
Joint Plant Constr 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.

Project |  | Ownership Interest |  | Source |  | Share of Generation |  | Share of Estimated Costs(a) |  | Costs incurred as of June 30, 2026(a) |  | Estimated Date of Commercial Operation
Darien(b)(c) |  | 10% |  | Battery |  | 7.5 MW |  | $18 million(k) |  | $7.4 million |  | 2027
Koshkonong(b)(d) |  | 10% |  | Solar/Battery |  | 30 MW/16.5 MW |  | $93 million(k) |  | $68.7 million |  | 2026 Solar 2027 Battery
High Noon(b)(e) |  | 10% |  | Solar/Battery |  | 30 MW/16.5 MW |  | $99 million |  | $63.3 million |  | 2027
Columbia Energy Dome(b)(e) |  | 19% |  | Storage |  | 3 MW |  | $22 million(k)(l) |  | $6.9 million |  | 2027
Badger Hollow(b)(f) |  | 10% |  | Wind |  | 11.2 MW |  | $36 million |  | $6.9 million |  | 2027
Whitetail(g) |  | 10% |  | Wind |  | 6.7 MW |  | $23 million |  | $1.2 million |  | 2027
Dawn Harvest(b)(h) |  | 10% |  | Solar |  | 15 MW |  | $34 million |  | $16.4 million |  | 2027
Forward Repower(b)(i) |  | 12.8% |  | Wind |  | 18 MW |  | $14 million |  | $5.3 million |  | 2027
Ursa(b)(e) |  | 10% |  | Solar |  | 20 MW |  | $46 million |  | $6.6 million |  | 2028
Saratoga(b)(j) |  | 10% |  | Solar/Battery |  | 15 MW/5 MW |  | $46 million |  | $12.1 million |  | 2028
Good Oak(b)(e) |  | 10% |  | Solar |  | 9.8 MW |  | $22 million |  | $8.4 million |  | 2028
Gristmill(b)(e) |  | 10% |  | Solar |  | 6.7 MW |  | $15 million |  | $5.9 million |  | 2028

(a)
Excluding AFUDC.
(b)
MGE received specific approval to recover 100% AFUDC. During the three and six months ended June 30, 2026, MGE recognized $4.7 million and $7.9 million, respectively, after tax, in AFUDC for these projects compared to $0.5 million and $2.1 million for the comparable periods 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)
Forward Wind Energy Center is located in Dodge and Fond du Lac Counties, Wisconsin.
(j)
Saratoga Solar Energy Center is located in Wood County, Wisconsin.
(k)
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 updated costs in its rate case proceedings.
(l)
This project was awarded with a grant from the U.S. Department of Energy's Office of Clean Energy Demonstrations. This will reduce the total estimated project expenses. The remaining cost is expected to be approximately $16 million. As of June 30, 2026, MGE received $4.3 million in reimbursements. This is not reflected in the table above.

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13.
Reven ue - MGE Energy and MGE.

Revenues disaggregated by revenue source were as follows:

|  | Three Months Ended |  |  | Six Months Ended |
(In thousands) |  | June 30, |  |  | June 30, |
Electric revenues |  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Residential |  | $ | 43,930 |  |  | $ | 43,182 |  |  | $ | 89,244 |  |  | $ | 88,321 |
Commercial |  |  | 65,618 |  |  |  | 64,027 |  |  |  | 127,037 |  |  |  | 124,662 |
Industrial |  |  | 3,274 |  |  |  | 3,117 |  |  |  | 6,122 |  |  |  | 6,081 |
Other-retail/municipal |  |  | 10,852 |  |  |  | 10,342 |  |  |  | 20,186 |  |  |  | 19,690 |
Total retail |  |  | 123,674 |  |  |  | 120,668 |  |  |  | 242,589 |  |  |  | 238,754 |
Sales to the market |  |  | 7,026 |  |  |  | 7,840 |  |  |  | 18,635 |  |  |  | 14,320 |
Other |  |  | 680 |  |  |  | 805 |  |  |  | 1,536 |  |  |  | 1,693 |
Total electric revenues |  |  | 131,380 |  |  |  | 129,313 |  |  |  | 262,760 |  |  |  | 254,767 |
Gas revenues |  |  |  |  |  |  |  |  |  |  |  |
Residential |  |  | 18,007 |  |  |  | 17,956 |  |  |  | 80,771 |  |  |  | 71,824 |
Commercial/Industrial |  |  | 9,859 |  |  |  | 10,434 |  |  |  | 55,364 |  |  |  | 47,547 |
Total retail |  |  | 27,866 |  |  |  | 28,390 |  |  |  | 136,135 |  |  |  | 119,371 |
Gas transportation |  |  | 1,555 |  |  |  | 1,384 |  |  |  | 4,322 |  |  |  | 3,697 |
Other |  |  | 180 |  |  |  | 151 |  |  |  | 407 |  |  |  | 338 |
Total gas revenues |  |  | 29,601 |  |  |  | 29,925 |  |  |  | 140,864 |  |  |  | 123,406 |
Non-regulated energy revenues |  |  | 214 |  |  |  | 214 |  |  |  | 274 |  |  |  | 249 |
Total Operating Revenue |  | $ | 161,195 |  |  | $ | 159,452 |  |  | $ | 403,898 |  |  | $ | 378,422 |

14.
Segment Infor mation - MGE Energy and MGE.

MGE Energy operates in the following business segments: electric utility, gas utility, nonregulated energy, transmission investment, and all other. See Footnote 22 to the consolidated financial statements included in Part II, Item 8 of the 2025 Annual Report on Form 10-K for additional discussion of each of these segments.

Fuel and purchased power and Purchased gas costs are significant segment expenses as defined in Segment Reporting. The Chief Operating Decision Maker does not review disaggregated assets on a segment basis; therefore, such information is not presented.

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The following tables show segment information for MGE Energy's and MGE's operations:

(In thousands) MGE Energy |  | Electric |  |  | Gas |  |  | Non-Regulated Energy |  |  | Transmission Investment |  |  | Total Reportable Segments |  |  | All Others |  |  | Consolidation/ Elimination |  |  | Consolidated Total |
Three Months Ended June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 131,380 |  |  | $ | 29,601 |  |  | $ | 214 |  |  | $ | — |  |  | $ | 161,195 |  |  | $ | — |  |  | $ | — |  |  | $ | 161,195 |
Interdepartmental revenues |  |  | (10 | ) |  |  | 2,195 |  |  |  | 11,576 |  |  |  | — |  |  |  | 13,761 |  |  |  | — |  |  |  | (13,761 | ) |  |  | — |
Total operating revenues |  |  | 131,370 |  |  |  | 31,796 |  |  |  | 11,790 |  |  |  | — |  |  |  | 174,956 |  |  |  | — |  |  |  | (13,761 | ) |  |  | 161,195 |
Fuel and purchased power |  |  | (19,509 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (19,509 | ) |  |  | — |  |  |  | 789 |  |  |  | (18,720 | )
Purchased gas costs |  |  | — |  |  |  | (10,702 | ) |  |  | — |  |  |  | — |  |  |  | (10,702 | ) |  |  | — |  |  |  | 1,417 |  |  |  | (9,285 | )
Depreciation and amortization |  |  | (21,959 | ) |  |  | (4,999 | ) |  |  | (1,981 | ) |  |  | — |  |  |  | (28,939 | ) |  |  | — |  |  |  | — |  |  |  | (28,939 | )
Interest expense |  |  | (8,168 | ) |  |  | (2,250 | ) |  |  | (818 | ) |  |  | — |  |  |  | (11,236 | ) |  |  | — |  |  |  | — |  |  |  | (11,236 | )
Other segment items(a) |  |  | (57,877 | ) |  |  | (15,372 | ) |  |  | (30 | ) |  |  | — |  |  |  | (73,279 | ) |  |  | 2,546 |  |  |  | 11,555 |  |  |  | (59,178 | )
Income tax (provision) benefit |  |  | (1,237 | ) |  |  | 599 |  |  |  | (2,441 | ) |  |  | (1,034 | ) |  |  | (4,113 | ) |  |  | (166 | ) |  |  | — |  |  |  | (4,279 | )
Equity in earnings of investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,795 |  |  |  | 3,795 |  |  |  | — |  |  |  | — |  |  |  | 3,795 |
Net income (loss) |  |  | 22,620 |  |  |  | (928 | ) |  |  | 6,520 |  |  |  | 2,761 |  |  |  | 30,973 |  |  |  | 2,380 |  |  |  | — |  |  |  | 33,353 |
Three Months Ended June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 129,313 |  |  | $ | 29,925 |  |  | $ | 214 |  |  | $ | — |  |  | $ | 159,452 |  |  | $ | — |  |  | $ | — |  |  | $ | 159,452 |
Interdepartmental revenues |  |  | (28 | ) |  |  | 2,558 |  |  |  | 11,121 |  |  |  | — |  |  |  | 13,651 |  |  |  | — |  |  |  | (13,651 | ) |  |  | — |
Total operating revenues |  |  | 129,285 |  |  |  | 32,483 |  |  |  | 11,335 |  |  |  | — |  |  |  | 173,103 |  |  |  | — |  |  |  | (13,651 | ) |  |  | 159,452 |
Fuel and purchased power |  |  | (22,524 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (22,524 | ) |  |  | — |  |  |  | 670 |  |  |  | (21,854 | )
Purchased gas costs |  |  | — |  |  |  | (13,211 | ) |  |  | — |  |  |  | — |  |  |  | (13,211 | ) |  |  | — |  |  |  | 1,898 |  |  |  | (11,313 | )
Depreciation and amortization |  |  | (22,094 | ) |  |  | (4,347 | ) |  |  | (1,913 | ) |  |  | — |  |  |  | (28,354 | ) |  |  | — |  |  |  | — |  |  |  | (28,354 | )
Interest expense |  |  | (6,485 | ) |  |  | (1,768 | ) |  |  | (889 | ) |  |  | — |  |  |  | (9,142 | ) |  |  | — |  |  |  | — |  |  |  | (9,142 | )
Other segment items(a) |  |  | (58,130 | ) |  |  | (15,015 | ) |  |  | (23 | ) |  |  | — |  |  |  | (73,168 | ) |  |  | (291 | ) |  |  | 11,083 |  |  |  | (62,376 | )
Income tax (provision) benefit |  |  | (472 | ) |  |  | 561 |  |  |  | (2,318 | ) |  |  | (835 | ) |  |  | (3,064 | ) |  |  | 89 |  |  |  | — |  |  |  | (2,975 | )
Equity in earnings of investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,060 |  |  |  | 3,060 |  |  |  | — |  |  |  | — |  |  |  | 3,060 |
Net income (loss) |  |  | 19,580 |  |  |  | (1,297 | ) |  |  | 6,192 |  |  |  | 2,225 |  |  |  | 26,700 |  |  |  | (202 | ) |  |  | — |  |  |  | 26,498 |
Six Months Ended June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 262,760 |  |  | $ | 140,864 |  |  | $ | 274 |  |  | $ | — |  |  | $ | 403,898 |  |  | $ | — |  |  | $ | — |  |  | $ | 403,898 |
Interdepartmental revenues |  |  | (18 | ) |  |  | 11,209 |  |  |  | 22,994 |  |  |  | — |  |  |  | 34,185 |  |  |  | — |  |  |  | (34,185 | ) |  |  | — |
Total operating revenues |  |  | 262,742 |  |  |  | 152,073 |  |  |  | 23,268 |  |  |  | — |  |  |  | 438,083 |  |  |  | — |  |  |  | (34,185 | ) |  |  | 403,898 |
Fuel and purchased power |  |  | (43,582 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (43,582 | ) |  |  | — |  |  |  | 2,086 |  |  |  | (41,496 | )
Purchased gas costs |  |  | — |  |  |  | (89,256 | ) |  |  | — |  |  |  | — |  |  |  | (89,256 | ) |  |  | — |  |  |  | 9,148 |  |  |  | (80,108 | )
Depreciation and amortization |  |  | (43,213 | ) |  |  | (9,864 | ) |  |  | (3,951 | ) |  |  | — |  |  |  | (57,028 | ) |  |  | — |  |  |  | — |  |  |  | (57,028 | )
Interest expense |  |  | (16,247 | ) |  |  | (4,473 | ) |  |  | (1,654 | ) |  |  | — |  |  |  | (22,374 | ) |  |  | — |  |  |  | — |  |  |  | (22,374 | )
Other segment items(a) |  |  | (113,151 | ) |  |  | (30,977 | ) |  |  | (81 | ) |  |  | — |  |  |  | (144,209 | ) |  |  | 2,999 |  |  |  | 22,951 |  |  |  | (118,259 | )
Income tax benefit (provision) |  |  | 1,744 |  |  |  | (4,664 | ) |  |  | (4,789 | ) |  |  | (1,999 | ) |  |  | (9,708 | ) |  |  | (427 | ) |  |  | — |  |  |  | (10,135 | )
Equity in earnings of investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,336 |  |  |  | 7,336 |  |  |  | — |  |  |  | — |  |  |  | 7,336 |
Net income |  |  | 48,293 |  |  |  | 12,839 |  |  |  | 12,793 |  |  |  | 5,337 |  |  |  | 79,262 |  |  |  | 2,572 |  |  |  | — |  |  |  | 81,834 |
Six Months Ended June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 254,767 |  |  | $ | 123,406 |  |  | $ | 249 |  |  | $ | — |  |  | $ | 378,422 |  |  | $ | — |  |  | $ | — |  |  | $ | 378,422 |
Interdepartmental revenues |  |  | (76 | ) |  |  | 9,030 |  |  |  | 22,225 |  |  |  | — |  |  |  | 31,179 |  |  |  | — |  |  |  | (31,179 | ) |  |  | — |
Total operating revenues |  |  | 254,691 |  |  |  | 132,436 |  |  |  | 22,474 |  |  |  | — |  |  |  | 409,601 |  |  |  | — |  |  |  | (31,179 | ) |  |  | 378,422 |
Fuel and purchased power |  |  | (45,630 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (45,630 | ) |  |  | — |  |  |  | 1,829 |  |  |  | (43,801 | )
Purchased gas costs |  |  | — |  |  |  | (72,501 | ) |  |  | — |  |  |  | — |  |  |  | (72,501 | ) |  |  | — |  |  |  | 7,224 |  |  |  | (65,277 | )
Depreciation and amortization |  |  | (43,629 | ) |  |  | (8,579 | ) |  |  | (3,824 | ) |  |  | — |  |  |  | (56,032 | ) |  |  | — |  |  |  | — |  |  |  | (56,032 | )
Interest expense |  |  | (12,978 | ) |  |  | (3,531 | ) |  |  | (1,795 | ) |  |  | — |  |  |  | (18,304 | ) |  |  | — |  |  |  | — |  |  |  | (18,304 | )
Other segment items(a) |  |  | (114,109 | ) |  |  | (31,111 | ) |  |  | (67 | ) |  |  | — |  |  |  | (145,287 | ) |  |  | (727 | ) |  |  | 22,126 |  |  |  | (123,888 | )
Income tax benefit (provision) |  |  | 1,430 |  |  |  | (4,426 | ) |  |  | (4,573 | ) |  |  | (1,702 | ) |  |  | (9,271 | ) |  |  | — |  |  |  | — |  |  |  | (9,271 | )
Equity in earnings of investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,241 |  |  |  | 6,241 |  |  |  | — |  |  |  | — |  |  |  | 6,241 |
Net income (loss) |  |  | 39,775 |  |  |  | 12,288 |  |  |  | 12,215 |  |  |  | 4,539 |  |  |  | 68,817 |  |  |  | (727 | ) |  |  | — |  |  |  | 68,090 |

(a)
Other segment items include AFUDC Income, Other Income, Net, Other Operations and Maintenance, Other General Taxes, and Interest Revenue.

30

(In thousands) MGE |  | Electric |  |  | Gas |  |  | Non-Regulated Energy |  |  | Total Reportable Segments |  |  | Consolidation/ Elimination |  |  | Consolidated Total |
Three Months Ended June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 131,380 |  |  | $ | 29,601 |  |  | $ | 214 |  |  | $ | 161,195 |  |  | $ | — |  |  | $ | 161,195 |
Interdepartmental revenues |  |  | (10 | ) |  |  | 2,195 |  |  |  | 11,576 |  |  |  | 13,761 |  |  |  | (13,761 | ) |  |  | — |
Total operating revenues |  |  | 131,370 |  |  |  | 31,796 |  |  |  | 11,790 |  |  |  | 174,956 |  |  |  | (13,761 | ) |  |  | 161,195 |
Fuel and purchased power |  |  | (19,509 | ) |  |  | — |  |  |  | — |  |  |  | (19,509 | ) |  |  | 789 |  |  |  | (18,720 | )
Purchased gas costs |  |  | — |  |  |  | (10,702 | ) |  |  | — |  |  |  | (10,702 | ) |  |  | 1,417 |  |  |  | (9,285 | )
Depreciation and amortization |  |  | (21,959 | ) |  |  | (4,999 | ) |  |  | (1,981 | ) |  |  | (28,939 | ) |  |  | — |  |  |  | (28,939 | )
Interest expense |  |  | (8,168 | ) |  |  | (2,250 | ) |  |  | (818 | ) |  |  | (11,236 | ) |  |  | — |  |  |  | (11,236 | )
Other segment items(b) |  |  | (57,877 | ) |  |  | (15,372 | ) |  |  | (30 | ) |  |  | (73,279 | ) |  |  | 11,555 |  |  |  | (61,724 | )
Income tax (provision) benefit |  |  | (1,237 | ) |  |  | 599 |  |  |  | (2,441 | ) |  |  | (3,079 | ) |  |  | — |  |  |  | (3,079 | )
Net income attributable to noncontrolling interest, net of tax |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,729 | ) |  |  | (5,729 | )
Net income (loss) attributable to MGE |  |  | 22,620 |  |  |  | (928 | ) |  |  | 6,520 |  |  |  | 28,212 |  |  |  | (5,729 | ) |  |  | 22,483 |
Three Months Ended June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 129,313 |  |  | $ | 29,925 |  |  | $ | 214 |  |  | $ | 159,452 |  |  | $ | — |  |  | $ | 159,452 |
Interdepartmental revenues |  |  | (28 | ) |  |  | 2,558 |  |  |  | 11,121 |  |  |  | 13,651 |  |  |  | (13,651 | ) |  |  | — |
Total operating revenues |  |  | 129,285 |  |  |  | 32,483 |  |  |  | 11,335 |  |  |  | 173,103 |  |  |  | (13,651 | ) |  |  | 159,452 |
Fuel and purchased power |  |  | (22,524 | ) |  |  | — |  |  |  | — |  |  |  | (22,524 | ) |  |  | 670 |  |  |  | (21,854 | )
Purchased gas costs |  |  | — |  |  |  | (13,211 | ) |  |  | — |  |  |  | (13,211 | ) |  |  | 1,898 |  |  |  | (11,313 | )
Depreciation and amortization |  |  | (22,094 | ) |  |  | (4,347 | ) |  |  | (1,913 | ) |  |  | (28,354 | ) |  |  | — |  |  |  | (28,354 | )
Interest expense |  |  | (6,485 | ) |  |  | (1,768 | ) |  |  | (889 | ) |  |  | (9,142 | ) |  |  | — |  |  |  | (9,142 | )
Other segment items(b) |  |  | (58,130 | ) |  |  | (15,015 | ) |  |  | (23 | ) |  |  | (73,168 | ) |  |  | 11,083 |  |  |  | (62,085 | )
Income tax (provision) benefit |  |  | (472 | ) |  |  | 561 |  |  |  | (2,318 | ) |  |  | (2,229 | ) |  |  | — |  |  |  | (2,229 | )
Net income attributable to noncontrolling interest, net of tax |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,714 | ) |  |  | (5,714 | )
Net income (loss) attributable to MGE |  |  | 19,580 |  |  |  | (1,297 | ) |  |  | 6,192 |  |  |  | 24,475 |  |  |  | (5,714 | ) |  |  | 18,761 |
Six Months Ended June 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 262,760 |  |  | $ | 140,864 |  |  | $ | 274 |  |  | $ | 403,898 |  |  | $ | — |  |  | $ | 403,898 |
Interdepartmental revenues |  |  | (18 | ) |  |  | 11,209 |  |  |  | 22,994 |  |  |  | 34,185 |  |  |  | (34,185 | ) |  |  | — |
Total operating revenues |  |  | 262,742 |  |  |  | 152,073 |  |  |  | 23,268 |  |  |  | 438,083 |  |  |  | (34,185 | ) |  |  | 403,898 |
Fuel and purchased power |  |  | (43,582 | ) |  |  | — |  |  |  | — |  |  |  | (43,582 | ) |  |  | 2,086 |  |  |  | (41,496 | )
Purchased gas costs |  |  | — |  |  |  | (89,256 | ) |  |  | — |  |  |  | (89,256 | ) |  |  | 9,148 |  |  |  | (80,108 | )
Depreciation and amortization |  |  | (43,213 | ) |  |  | (9,864 | ) |  |  | (3,951 | ) |  |  | (57,028 | ) |  |  | — |  |  |  | (57,028 | )
Interest expense |  |  | (16,247 | ) |  |  | (4,473 | ) |  |  | (1,654 | ) |  |  | (22,374 | ) |  |  | — |  |  |  | (22,374 | )
Other segment items(b) |  |  | (113,151 | ) |  |  | (30,977 | ) |  |  | (81 | ) |  |  | (144,209 | ) |  |  | 22,951 |  |  |  | (121,258 | )
Income tax benefit (provision) |  |  | 1,744 |  |  |  | (4,664 | ) |  |  | (4,789 | ) |  |  | (7,709 | ) |  |  | — |  |  |  | (7,709 | )
Net income attributable to noncontrolling interest, net of tax |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (11,335 | ) |  |  | (11,335 | )
Net income (loss) attributable to MGE |  |  | 48,293 |  |  |  | 12,839 |  |  |  | 12,793 |  |  |  | 73,925 |  |  |  | (11,335 | ) |  |  | 62,590 |
Six Months Ended June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 254,767 |  |  | $ | 123,406 |  |  | $ | 249 |  |  | $ | 378,422 |  |  | $ | — |  |  | $ | 378,422 |
Interdepartmental revenues |  |  | (76 | ) |  |  | 9,030 |  |  |  | 22,225 |  |  |  | 31,179 |  |  |  | (31,179 | ) |  |  | — |
Total operating revenues |  |  | 254,691 |  |  |  | 132,436 |  |  |  | 22,474 |  |  |  | 409,601 |  |  |  | (31,179 | ) |  |  | 378,422 |
Fuel and purchased power |  |  | (45,630 | ) |  |  | — |  |  |  | — |  |  |  | (45,630 | ) |  |  | 1,829 |  |  |  | (43,801 | )
Purchased gas costs |  |  | — |  |  |  | (72,501 | ) |  |  | — |  |  |  | (72,501 | ) |  |  | 7,224 |  |  |  | (65,277 | )
Depreciation and amortization |  |  | (43,629 | ) |  |  | (8,579 | ) |  |  | (3,824 | ) |  |  | (56,032 | ) |  |  | — |  |  |  | (56,032 | )
Interest expense |  |  | (12,978 | ) |  |  | (3,531 | ) |  |  | (1,795 | ) |  |  | (18,304 | ) |  |  | — |  |  |  | (18,304 | )
Other segment items(b) |  |  | (114,109 | ) |  |  | (31,111 | ) |  |  | (67 | ) |  |  | (145,287 | ) |  |  | 22,126 |  |  |  | (123,161 | )
Income tax benefit (provision) |  |  | 1,430 |  |  |  | (4,426 | ) |  |  | (4,573 | ) |  |  | (7,569 | ) |  |  | — |  |  |  | (7,569 | )
Net income attributable to noncontrolling interest, net of tax |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (11,313 | ) |  |  | (11,313 | )
Net income (loss) attributable to MGE |  |  | 39,775 |  |  |  | 12,288 |  |  |  | 12,215 |  |  |  | 64,278 |  |  |  | (11,313 | ) |  |  | 52,965 |

(b)
Other segment items include AFUDC Income, Other Income, Net, Other Operations and Maintenance, Other General Taxes, and Interest Revenue.

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The following tables show segment information for MGE Energy's and MGE's capital expenditures:

|  | Utility |  |  | Consolidated |
(In thousands) MGE Energy |  | Electric |  |  | Gas |  |  | Non-regulated Energy |  |  | Transmission Investment |  |  | All Others |  |  | Consolidation/ Elimination Entries |  |  | Total |
Six Months Ended June 30, 2026 |  | $ | 174,157 |  |  | $ | 28,308 |  |  | $ | 8,441 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 210,906 |
Six Months Ended June 30, 2025 |  |  | 83,034 |  |  |  | 22,975 |  |  |  | 5,744 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 111,753 |

|  | Utility |  |  | Consolidated |
(In thousands) MGE |  | Electric |  |  | Gas |  |  | Non-regulated Energy |  |  | Consolidation/ Elimination Entries |  |  | Total |
Six Months Ended June 30, 2026 |  | $ | 174,157 |  |  | $ | 28,308 |  |  | $ | 8,441 |  |  | $ | — |  |  | $ | 210,906 |
Six Months Ended June 30, 2025 |  |  | 83,034 |  |  |  | 22,975 |  |  |  | 5,744 |  |  |  | — |  |  |  | 111,753 |

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## Item 2. Man agement's Discussion and Analysis of Financial Condition and Results of Operations.

General

MGE Energy is an investor-owned public utility holding company operating through subsidiaries in five business segments:

•
Regulated electric utility operations, conducted through MGE, which generate and distribute electricity to approximately 170,000 customers in Dane County, Wisconsin,
•
Regulated gas utility operations, conducted through MGE, which distribute natural gas to approximately 180,000 customers in seven south-central and western Wisconsin counties,
•
Nonregulated energy operations, conducted through MGE Power and its subsidiaries, which own interests in electric generating capacity that is leased to MGE,
•
Transmission investments, representing our equity investment in ATC, which owns and operates electric transmission facilities primarily in Wisconsin, and ATC Holdco, a company created to facilitate out-of-state electric transmission development and investments, and
•
All other, which includes investing in companies and property that relate to the regulated operations and financing of the regulated operations, through its wholly owned subsidiaries CWDC, MAGAEL, and North Mendota, and corporate operations and services.

MGE will continue to focus on growing earnings while controlling operating and fuel costs. MGE's goal is to provide safe and efficient operations in addition to providing customer value. We believe it is critical to maintain a strong credit rating consistent with financial strength in MGE in order to accomplish these goals.

The ownership/leasing structure for our nonregulated energy operations was adopted under applicable state regulatory guidelines for MGE's participation in these generation facilities, consisting principally of a stable return on the equity investment in the new generation facilities over the term of the related leases. The nonregulated energy operations include an ownership interest in two coal-fired generating units in Oak Creek, Wisconsin, and a partial ownership of a cogeneration project on the UW-Madison campus. A third party operates the units in Oak Creek, and MGE operates the cogeneration project. Due to the nature of MGE's participation in these facilities, the results of MGE Energy's nonregulated operations are also consolidated into MGE's consolidated financial position and results of operations under applicable accounting standards.

Executive Overview

We principally earn revenue and generate cash from operations by providing electric and natural gas utility services, including electric power generation and electric power and gas distribution. The earnings and cash flows from the utility business are sensitive to various external factors, including, but not limited to:

•
Weather, and its impact on customer sales,
•
Economic conditions, including current business activity and employment and their impact on customer demand,
•
Regulation and regulatory issues, and their impact on the timing and recovery of costs,
•
Energy commodity prices, including natural gas prices,
•
Equity price risk pertaining to pension-related assets,
•
Credit market conditions, including interest rates and our debt credit rating,
•
Environmental laws and regulations, including adopted and pending environmental rule changes, and
•
Other factors listed in Item 1A. Risk Factors in our 2025 Annual Report on Form 10-K.

During the three months ended June 30, 2026, MGE Energy's earnings were $33.4 million, or $0.89 per diluted share, compared to $26.5 million, or $0.72 per diluted share, during the same period in the prior year. MGE's earnings during the three months ended June 30, 2026, were $22.5 million compared to $18.8 million during the same period in the prior year.

During the six months ended June 30, 2026, MGE Energy's earnings were $81.8 million, or $2.21 per diluted share, compared to $68.1 million, or $1.86 per diluted share, during the same period in the prior year. MGE's earnings during the six months ended June 30, 2026, were $62.6 million compared to $53.0 million during the same period in the prior year.

33

MGE Energy's net income was derived from our business segments as follows:

| Three Months Ended |  | Six Months Ended
(In millions) | June 30, |  | June 30,
Business Segment: | 2026 |  | 2025 |  | 2026 |  | 2025
Electric Utility | $ | 22.6 |  | $ | 19.6 |  | $ | 48.3 |  | $ | 39.8
Gas Utility |  | (1.0) |  |  | (1.3) |  |  | 12.8 |  |  | 12.3
Nonregulated Energy |  | 6.5 |  |  | 6.2 |  |  | 12.8 |  |  | 12.2
Transmission Investments |  | 2.8 |  |  | 2.2 |  |  | 5.3 |  |  | 4.5
All Other |  | 2.5 |  |  | (0.2) |  |  | 2.6 |  |  | (0.7)
Net Income | $ | 33.4 |  | $ | 26.5 |  | $ | 81.8 |  | $ | 68.1

Our net income during the three and six months ended June 30, 2026, compared to the same periods in the prior year, primarily reflects the effects of the following factors:

Electric Utility

Earnings for the three and six months ended June 30, 2026, increased year-over-year, primarily driven by a rise in the rate base due to increased electric investments approved in the 2026/2027 rate case.

All Other

Investment gains from venture capital funds resulted in higher earnings for the three and six months ended June 30, 2026, compared to the same period in the prior year. These venture capital investments support early-stage companies working to advance smart technologies, the customer experience, distributed energy resources, electrification, cybersecurity and other priorities for utility companies, such as greater sustainability.

Significant Events

The following events affected the first six months of 2026:

2026/2027 Rate Settlement Agreement: In December 2025, the PSCW approved a unanimous settlement agreement that MGE reached with intervening parties in its 2026/2027 rate case. As part of the settlement agreement, the PSCW approved a 0.15% increase for electric rates and a 2.77% increase to gas rates for 2026 and a 3.63% increase for electric rates and a 2.04% increase to gas rates for 2027. MGE filed a 2027 Fuel Cost Plan with the PSCW in June 2026. MGE expects a final decision from the PSCW on the Fuel Cost Plan by the end of 2026. See "Other Matters" below for additional information on the 2026/2027 rate case settlement.

2026 Deferred Fuel Savings: MGE had deferred fuel savings through the six months ended June 30, 2026. As of June 30, 2026, MGE deferred $6.7 million of 2026 fuel savings. These costs will be subject to the PSCW's annual review of 2026 fuel costs, expected to be completed during 2027. See Footnote 9 of the Notes to the Consolidated Financial Statements in this Report for further information regarding fuel cost proceedings.

Large Scale Utility Projects: Large scale generation projects recently completed or under construction are summarized in the following table. Incurred costs are reflected in "Property, plant, and equipment, net" for projects placed in service, or "Construction work in progress" for projects under construction on the consolidated balance sheets.

Source (In millions) |  | Share of Estimated Costs(a) |  |  | Costs Incurred as of June 30, 2026(a)(b)
Solar | $ | 539 |  | $ | 175.0
Wind |  | 73 |  |  | 13.4
Battery |  | 200 |  |  | 84.0
Storage |  | 22 |  |  | 6.9
Other |  | 11 |  |  | 1.0

(a)
Excluding AFUDC.
(b)
MGE received specific approval to recover 100% AFUDC. After tax, MGE recognized $4.4 million, $3.3 million, $1.9 million, and $2.0 million of AFUDC equity earnings through June 30, 2026, on Koshkonong, High Noon, Sunnyside, and other projects, respectively, during construction. AFUDC has been excluded from the costs incurred in the table above.

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In February 2026, MGE executed an asset purchase agreement to acquire a 33.4% ownership interest in the RockGen Energy Center, an existing natural gas-fired generating plant near Cambridge, Wisconsin. MGE's estimated cost is approximately $203 million. If approved, the transaction is expected to close in late 2027.

In the near term, several items may affect us, including:

2025 Annual Fuel Proceeding: MGE had fuel savings in 2025. As of December 31, 2025, MGE deferred $7.1 million of 2025 fuel savings. The PSCW has completed the annual review of 2025 fuel costs and gave approval for MGE to return these savings in October 2026. There was no change to the costs to be refunded in the fuel rule proceedings from the amount MGE deferred in the previous year.

Environmental Initiatives: There are proposed legislative rules and initiatives involving matters related to air emissions, water effluent, hazardous materials, and greenhouse gases, all of which affect generation plant capital expenditures and operating costs as well as future operational planning. Legislation and rulemaking addressing climate change and related matters could significantly affect the costs of owning and operating fossil-fueled generating plants. MGE would expect to seek and receive recovery of any such costs in rates. However, it is difficult to estimate the amount of such costs due to the uncertainty as to the timing and form of any legislation or rules, the timing and effects of any judicial review, and the scope and time of the recovery of costs in rates, which may occur after those costs have been incurred and paid.

Future Generation – MGE continues to work toward its goal of net-zero carbon electricity by 2050. Solar, wind, and battery storage projects are a major step toward deep decarbonization and greater use of clean energy sources in pursuit of our goal.

•
Growing renewable generation and storage. MGE is seeking to acquire, or has acquired, joint interests in several renewable generation and storage projects. The forecasted capital expenditures include approximately 252 MW of solar, 18 MW of wind, and 104 MW of storage, which include projects approved or pending PSCW approval. See the 2026-2030 capital expenditures forecast disclosed in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations in our 2025 Annual Report on Form 10-K.

•
Transitioning away from coal. Elm Road Units: In October 2025, MGE, along with the plant co-owners, filed a joint application with the PSCW to end the use of coal as a primary fuel at the Elm Road Units and transition the plant to natural gas. See the 2026-2030 capital expenditures forecast disclosed in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations in our 2025 Annual Report on Form 10-K. By the end of 2030, coal is expected to be used only as a backup fuel at the Elm Road Units. By the end of 2032, MGE expects that the Elm Road Units will be fully transitioned away from coal.

Columbia: Operational, regulatory, and environmental regulation considerations have impacted and continue to impact Columbia's generation planning. MGE, as a minority owner, and Columbia's other co-owners continue to evaluate transitioning away from coal and continue to evaluate replacing the generation from Columbia while maintaining electric service reliability. MGE and Columbia's co-owners are exploring converting Columbia to natural gas.

Environmental Initiatives – Natural gas distribution: Building upon our long-standing commitment to providing affordable, sustainable energy, MGE has set a goal to achieve net-zero methane emissions from its natural gas distribution system by 2035. If MGE can accelerate plans to achieve net-zero methane emissions from its natural gas system—through the evolution of new technologies, such as renewable natural gas—it will. MGE is working to reduce overall emissions from its natural gas distribution system in a quick and cost-effective manner. MGE offers two voluntary renewable natural gas programs. The initial program, launched in May 2024, enables customers to offset emissions associated with their natural gas consumption through a mechanism in which MGE purchases renewable thermal credits and retires them on behalf of participating customers. The second program, launched in January 2026, enables customers to inject renewable natural gas produced on the customer's premise into MGE's distribution system. Customers may sell the natural gas to MGE or another third party and may retain or sell to MGE or another third party the associated environmental attributes.

Solar Procurement Disruptions: MGE is monitoring import regulations under the Uyghur Forced Labor Prevention Act and the U.S. Department of Commerce's new solar tariffs. These disruptions have a potential to impact current and future solar projects which may result in an increase in costs or delays in construction timelines. In the event that such disruptions cause costs to exceed the levels approved for specific projects, we have filed, and expect to continue to file, notifications with the PSCW and expect to request

35

recovery of any increases in MGE's future rate proceedings. See "Other Matters" below for additional information on the solar procurement disruptions.

Tariffs: MGE is monitoring the actions of the Trump Administration with respect to certain proposed or recently implemented import tariffs on foreign goods. These tariffs have a potential impact on cost of operations and on current and future capital projects. See "Other Matters" below for additional information on tariffs.

Financing and Equity Issuance Plans: As of June 30, 2026, MGE has $140 million of remaining regulatory authority from the PSCW to issue long-term debt to finance authorized utility capital expenditures. MGE expects to use a portion of the remaining authority during 2026 to finance authorized utility capital expenditures. MGE Energy has equity programs available to issue new shares of common stock, including its at-the-market offering program, forward equity sale agreements, and its Direct Stock Purchase and Dividend Reinvestment Plan. See Footnote 6 of the Notes to Consolidated Financial Statements in this Report for additional information on these programs.

The amount and timing of any financings will be primarily driven by capital investments and cash requirements and will depend upon market conditions, regulatory approvals, and other factors.

Large-Load Growth: Management is seeing growing interest from large‑load customers, including data‑intensive and technology‑focused operations, seeking reliable and scalable electric service in our service territory. Our favorable location, strong regional transmission access, and proximity to major economic and research institutions support this interest. MGE engages early with prospective customers to evaluate load needs, interconnection requirements, and potential system impacts. Although the timing and size of individual projects remain uncertain, these inquiries represent a potential source of incremental and durable load growth.

The following discussion is based on the business segments as discussed in Footnote 14 of the Notes to Consolidated Financial Statements in this Report.

Results of Operations

Three Months Ended June 30, 2026 and 2025

Electric sales and revenues

The following table compares MGE's electric revenues and electric kWh sales by customer class for each of the periods indicated:

|  | Revenues |  | Sales (kWh)
|  | Three Months Ended June 30, |  | Three Months Ended June 30,
(In thousands, except CDD) |  | 2026 |  | 2025 |  | % Change |  | 2026 |  | 2025 |  | % Change
Residential |  | $ | 43,930 |  | $ | 43,182 |  | 1.7% |  | 203,576 |  | 203,344 |  | 0.1%
Commercial |  |  | 65,618 |  |  | 64,027 |  | 2.5% |  | 439,310 |  | 439,972 |  | (0.2)%
Industrial |  |  | 3,274 |  |  | 3,117 |  | 5.0% |  | 36,746 |  | 35,737 |  | 2.8%
Other-retail/municipal |  |  | 10,852 |  |  | 10,342 |  | 4.9% |  | 102,697 |  | 99,198 |  | 3.5%
Total retail |  |  | 123,674 |  |  | 120,668 |  | 2.5% |  | 782,329 |  | 778,251 |  | 0.5%
Sales to the market |  |  | 7,026 |  |  | 7,840 |  | (10.4)% |  | 62,600 |  | 92,400 |  | (32.3)%
Other |  |  | 680 |  |  | 805 |  | (15.5)% |  | — |  | — |  | —%
Total |  | $ | 131,380 |  | $ | 129,313 |  | 1.6% |  | 844,929 |  | 870,651 |  | (3.0)%
Cooling degree days (normal 203) |  |  |  |  |  |  |  |  |  | 164 |  | 223 |  | (26.5)%

Electric revenue increased $2.1 million during the three months ended June 30, 2026, compared to the same period in the prior year, due to the following:

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(In millions) |  |
Rate changes | $ | 2.0
Customer fixed and demand charges |  | 0.6
Revenue subject to refund, net |  | 0.3
Net increase in commercial, industrial and other-retail/municipal volume |  | 0.1
Sales to the market |  | (0.8)
Other |  | (0.1)
Total | $ | 2.1

•
Rate changes. In December 2025, the PSCW authorized MGE to increase 2026 rates for retail electric customers by approximately 0.15%. Rates charged to retail customers during the three months ended June 30, 2026, were $2.0 million higher than those charged during the same period in the prior year. See Footnote 9 of the Notes to Consolidated Financial Statements in this Report for further information on the rate increase. Any increases in rates associated with fuel or purchase power costs are generally offset by fuel and purchased power costs and do not have a significant impact on net income.

•
Sales to the market. Sales to the market typically occur when MGE has more generation in the MISO market than is needed for its customer demand. The excess electricity is then sold to other utilities or power marketers in the MISO market. During the three months ended June 30, 2026, market volumes decreased compared to the same period in the prior year, reflecting a decrease in sales. This decrease was partially offset by an increase in the cost of capacity sold. The revenue generated from these sales is largely offset by fuel rules costs, and does not have a significant impact on net income. See fuel rules discussion in Footnote 9 of the Notes to Consolidated Financial Statements in this Report.

Electric fuel and purchased power

| Three Months Ended June 30,
(In millions) | 2026 |  | 2025 |  | $ Change
Fuel for electric generation | $ | 12.9 |  | $ | 16.3 |  | $ | (3.4)
Purchased power |  | 5.8 |  |  | 5.6 |  |  | 0.2

The $3.4 million decrease in fuel for electric generation was due to an approximately 23% decrease in internal generation driven by a decrease in sales, partially offset by a 2% increase in the average cost, each compared to the same period in the prior year.

Excluding deferred fuel costs, purchased power increased $0.3 million. The increase in purchased power was due to an approximately 59% increase in market purchases as a result of decreased internal generation. This increase was partially offset by an approximately 34% decrease in average cost. There were no deferred fuel costs recovered during the three months ended June 30, 2026 and 2025.

Fuel and purchased power costs are generally offset by electric revenue and do not have a significant impact on net income. MGE expects to seek and receive recovery of fuel and purchased power costs that exceed the fuel rules bandwidth in customer rates. See Footnote 9 of the Notes to Consolidated Financial Statements in this Report for further information on the fuel rules bandwidth.

Gas deliveries and revenues

The following table compares MGE's gas revenues and gas therms delivered by customer class for each of the periods indicated:

|  | Revenues |  | Therms Delivered
(In thousands, except HDD and average |  | Three Months Ended June 30, |  | Three Months Ended June 30,
rate per therm of retail customer) |  | 2026 |  | 2025 |  | % Change |  | 2026 |  | 2025 |  | % Change
Residential |  | $ | 18,007 |  | $ | 17,956 |  | 0.3% |  | 12,450 |  | 13,034 |  | (4.5)%
Commercial/Industrial |  |  | 9,859 |  |  | 10,434 |  | (5.5)% |  | 13,956 |  | 14,484 |  | (3.6)%
Total retail |  |  | 27,866 |  |  | 28,390 |  | (1.8)% |  | 26,406 |  | 27,518 |  | (4.0)%
Gas transportation |  |  | 1,555 |  |  | 1,384 |  | 12.4% |  | 15,223 |  | 15,429 |  | (1.3)%
Other |  |  | 180 |  |  | 151 |  | 19.2% |  | — |  | — |  | —%
Total |  | $ | 29,601 |  | $ | 29,925 |  | (1.1)% |  | 41,629 |  | 42,947 |  | (3.1)%
Heating degree days (normal 794) |  |  |  |  |  |  |  |  |  | 701 |  | 843 |  | (16.8)%
Average rate per therm of retail customer |  | $ | 1.055 |  | $ | 1.032 |  | 2.2% |  |  |  |  |  |

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Gas revenue decreased $0.3 million during the three months ended June 30, 2026, compared to the same period in the prior year, due to the following:

(In millions) |  |
Decrease in volume | $ | (0.8)
Rate changes |  | (0.6)
Revenue subject to refund, net |  | (0.2)
Other |  | 1.3
Total | $ | (0.3)

•
Other. For the three months ended June 30, 2026, other gas revenue increased primarily due to customer growth and higher residential customer fixed rate.

Cost of gas sold

Cost of gas sold decreased $2.0 million during the three months ended June 30, 2026, compared to the same period in the prior year. Cost per therm decreased approximately 14% and there was a decrease in therms delivered of approximately 5%. MGE recovers the cost of natural gas in its gas segment through the PGA as described under gas deliveries and revenues above.

Consolidated operations and maintenance expenses

During the three months ended June 30, 2026, operations and maintenance expenses increased $7.5 million, compared to the same period in the prior year. The following contributed to the net change:

(In millions) |  |
Increased administrative and general costs | $ | 3.4
Increased electric production expenses |  | 1.6
Increased transmission costs |  | 1.6
Increased electric distribution expenses |  | 0.8
Increased other expenses |  | 0.1
Total | $ | 7.5

•
Increased administrative and general costs are primarily related to increased pension and other postretirement costs. The PSCW has authorized MGE to defer as a regulatory asset or liability, the difference between actual pension and other postretirement costs included in rates and to be recovered or refunded in a future rate proceeding. Pension and other postretirement cost are generally offset by electric revenue and does not have a significant impact on net income.

•
Electric production expenses increased primarily due to higher operating and maintenance costs at the Columbia generating station, including boiler plant maintenance and other generation-related expenses, along with increased costs associated with renewable generating facilities.

•
Increased transmission costs are primarily a result of an increase in transmission rate. Transmission costs represent ATC and MISO network transmission expenses authorized to collect in rates. The PSCW has authorized MGE to defer as a regulatory asset or liability, the difference between actual costs included in rates and to be recovered or refunded in a future rate proceeding. Transmission cost is generally offset by electric revenue and does not have a significant impact on net income.

Consolidated depreciation expense

Electric depreciation expense decreased $0.1 million and gas depreciation expense increased $0.7 million during the three months ended June 30, 2026, compared to the same period in the prior year. In December 2025, the PSCW approved new depreciation rates, which were implemented and became effective as of January 1, 2026. These new rates were the primary driver for the change in depreciation expense.

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Electric and gas other income

Electric other income increased $4.9 million and gas other income increased $2.0 million during the three months ended June 30, 2026, compared to the same period in the prior year, driven by a $2.3 million positive impact from non-service costs components of pension and other postretirement costs. The PSCW has authorized MGE to defer as a regulatory asset or liability, the difference between actual pension and other postretirement costs included in rates and to be recovered or refunded in a future rate proceeding. Pension and other postretirement cost is generally offset by electric and gas revenue and does not have a significant impact on net income. Higher AFUDC-Equity due to continued capital investment further contributed to an increase in electric other income.

Nonregulated Energy Operations - MGE Energy and MGE

The nonregulated energy operations are conducted through MGE Energy's subsidiaries: MGE Power Elm Road (the Elm Road Units) and MGE Power West Campus (WCCF), which have been formed to own and lease electric generating capacity to assist MGE. During the three months ended June 30, 2026 and 2025, net income at the nonregulated energy operations segment was $6.5 million and $6.2 million, respectively.

Transmission Investment Operations - MGE Energy

The transmission investment segment holds our interest in ATC and ATC Holdco, and its income reflects our equity in the earnings of those investments. ATC Holdco was formed in December 2016 to pursue transmission development opportunities that typically have long development and investment lead times before becoming operational. During the three months ended June 30, 2026 and 2025, other income at the transmission investment segment primarily reflects ATC's operations and was $3.8 million and $3.1 million, respectively. See Footnote 3 of the Notes to Consolidated Financial Statements in this Report for summarized financial information regarding ATC.

All Other Operations - MGE Energy

Other income

The increase of $2.9 million in other income from all other operations during the three months ended June 30, 2026, primarily reflects results from investment gains recognized in the current year, from venture capital funds. These venture capital investments support early-stage companies working to advance smart technologies, the customer experience, distributed energy resources, electrification, cybersecurity and other priorities for utility companies, such as greater sustainability.

Consolidated Income Taxes - MGE Energy and MGE

See Footnote 4 of the Notes to Consolidated Financial Statements in this Report for the effective tax rate reconciliation.

Noncontrolling Interest, Net of Tax - MGE

Noncontrolling interest, net of tax, reflects the accounting required for MGE Energy's interest in MGE Power Elm Road (the Elm Road Units) and MGE Power West Campus (WCCF). MGE Energy owns 100% of MGE Power Elm Road and MGE Power West Campus. They are not owned by MGE. Due to the contractual agreements for these projects with MGE, the entities are considered VIEs with respect to MGE and their results are consolidated with those of MGE, the primary beneficiary of the VIEs. The following table shows MGE Energy's noncontrolling interest, net of tax, reflected on MGE's consolidated statement of income:

|  | Three Months Ended
|  | June 30,
(In millions) |  | 2026 |  |  | 2025
MGE Power Elm Road | $ | 3.8 |  | $ | 3.9
MGE Power West Campus |  | 1.9 |  |  | 1.8

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Results of Operations

Six Months Ended June 30, 2026 and 2025

Electric sales and revenues

The following table compares MGE's electric revenues and electric kWh sales by customer class for each of the periods indicated:

|  |  | Revenues |  | Sales (kWh)
|  |  | Six Months Ended June 30, |  | Six Months Ended June 30,
(In thousands, except CDD) |  |  | 2026 |  |  | 2025 |  | % Change |  | 2026 |  | 2025 |  | % Change
Residential |  | $ | 89,244 |  | $ | 88,321 |  | 1.0% |  | 418,909 |  | 418,336 |  | 0.1%
Commercial |  |  | 127,037 |  |  | 124,662 |  | 1.9% |  | 873,469 |  | 870,250 |  | 0.4%
Industrial |  |  | 6,122 |  |  | 6,081 |  | 0.7% |  | 71,570 |  | 70,270 |  | 1.9%
Other-retail/municipal |  |  | 20,186 |  |  | 19,690 |  | 2.5% |  | 182,920 |  | 178,950 |  | 2.2%
Total retail |  |  | 242,589 |  |  | 238,754 |  | 1.6% |  | 1,546,868 |  | 1,537,806 |  | 0.6%
Sales to the market |  |  | 18,635 |  |  | 14,320 |  | 30.1% |  | 180,352 |  | 219,499 |  | (17.8)%
Other revenues |  |  | 1,536 |  |  | 1,693 |  | (9.3)% |  | — |  | — |  | —%
Total |  | $ | 262,760 |  | $ | 254,767 |  | 3.1% |  | 1,727,220 |  | 1,757,305 |  | (1.7)%
Cooling degree days (normal 203) |  |  |  |  |  |  |  |  |  | 164 |  | 223 |  | (26.5)%

Electric revenue increased $8.0 million during the six months ended June 30, 2026, compared to the same period in the prior year, due to the following:

(In millions) |  |
Sales to the market | $ | 4.3
Rate changes |  | 4.0
Customer fixed and demand charges |  | 1.1
Net increase in commercial, industrial and other-retail/municipal volume |  | 0.3
Increase in residential volume |  | 0.1
Revenue subject to refund, net |  | (1.6)
Other |  | (0.2)
Total | $ | 8.0

•
Sales to the market. Sales to the market typically occur when MGE has more generation in the MISO market than is needed for its customer demand. The excess electricity is then sold to other utilities or power marketers in the MISO market. During the six months ended June 30, 2026, sales were made at higher market prices and partially offset by decreased market volume compared to the same period in the prior year. The revenue generated from these sales is largely offset by fuel rules costs, and does not have a significant impact on net income. See fuel rules discussion in Footnote 9 of the Notes to Consolidated Financial Statements in this Report.

•
Rate changes. In December 2025, the PSCW authorized MGE to increase 2026 rates for retail electric customers by approximately 0.15%. Rates charged to retail customers during the six months ended June 30, 2026, were $4.0 million higher than those charged during the same period in the prior year. See Footnote 9 of the Notes to Consolidated Financial Statements in this Report for further information on the rate increase. Any increases in rates associated with fuel or purchase power costs are generally offset by fuel and purchased power costs and do not have a significant impact on net income.

•
Customer fixed and demand charges. During the six months ended June 30, 2026, fixed and demand charges increased $1.1 million, primarily attributable to the increase in demand charges for commercial customers.

•
Revenue subject to refund. For cost recovery mechanisms, any over-collection of revenues resulting from costs authorized to be collected from customers in rates exceeding actual costs is recorded as a reduction of revenue in the period incurred, as the over-collection is expected to be refunded to customers in a subsequent period. In the year the over-collection is refunded, rates are reduced and offset as revenue subject to refund. There is no net income impact in the year the costs are refunded.

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Electric fuel and purchased power

| Six Months Ended June 30,
(In millions) | 2026 |  | 2025 |  | $ Change
Fuel for electric generation | $ | 33.2 |  | $ | 33.9 |  | $ | (0.7)
Purchased power |  | 8.3 |  |  | 9.9 |  |  | (1.6)

The $0.7 million decrease in fuel for electric generation in the first six months of 2026 was due to an approximately 5.4% decrease in internal generation, partially offset by a 3.8% increase in the average cost, each compared to the same period in the prior year.

Excluding deferred fuel costs, purchased power decreased $1.7 million in the first six months of 2026, compared to the same period in the prior year. The decrease in purchased power was due to an approximately 42% decrease in average cost. This decrease was partially offset by an approximately 43% increase in market purchases as a result of decreased internal generation. There were no deferred fuel costs recovered during the six months ended June 30, 2026 and 2025.

Fuel and purchased power costs are generally offset by electric revenue and do not have a significant impact on net income. MGE expects to seek and receive recovery of fuel and purchased power costs that exceed the fuel rules bandwidth in customer rates. See Footnote 9 of the Notes to Consolidated Financial Statements in this Report for further information on the fuel rules bandwidth.

Gas deliveries and revenues

The following table compares MGE's gas revenues and gas therms delivered by customer class for each of the periods indicated:

|  |  | Revenues |  | Therms Delivered
(In thousands, except HDD and average |  |  | Six Months Ended June 30, |  | Six Months Ended June 30,
rate per therm of retail customer) |  |  | 2026 |  |  | 2025 |  | % Change |  | 2026 |  | 2025 |  | % Change
Residential |  | $ | 80,771 |  | $ | 71,824 |  | 12.5% |  | 62,708 |  | 65,263 |  | (3.9)%
Commercial/Industrial |  |  | 55,364 |  |  | 47,547 |  | 16.4% |  | 58,972 |  | 60,620 |  | (2.7)%
Total retail |  |  | 136,135 |  |  | 119,371 |  | 14.0% |  | 121,680 |  | 125,883 |  | (3.3)%
Gas transportation |  |  | 4,322 |  |  | 3,697 |  | 16.9% |  | 36,964 |  | 37,253 |  | (0.8)%
Other revenues |  |  | 407 |  |  | 338 |  | 20.4% |  | — |  | — |  | —%
Total |  | $ | 140,864 |  | $ | 123,406 |  | 14.1% |  | 158,644 |  | 163,136 |  | (2.8)%
Heating degree days (normal 4,284) |  |  |  |  |  |  |  |  |  | 4,028 |  | 4,212 |  | (4.4)%
Average rate per therm of retail customer |  | $ | 1.119 |  | $ | 0.948 |  | 18.0% |  |  |  |  |  |

Gas revenue increased $17.5 million during the six months ended June 30, 2026, compared to the same period in the prior year, due to the following:

(In millions) |  |
Rate changes | $ | 16.2
Other |  | 2.4
Revenue subject to refund, net |  | 2.2
Decrease in volume |  | (3.3)
Total | $ | 17.5

•
Rate changes. In December 2025, the PSCW authorized MGE to increase 2026 rates for retail gas customers by approximately 2.77%.

MGE recovers the cost of natural gas in its gas segment through the PGA. Under the PGA, MGE is able to pass through to its gas customers the cost of gas. Changes in PGA recoveries affect revenues but do not change net income in view of the pass-through treatment of the costs. Payments for natural gas increased, driving higher rates during the six months ended June 30, 2026.

The average retail rate per therm excluding customer fixed charges for the six months ended June 30, 2026, increased approximately 18% compared to the same period in the prior year, reflecting an increase in natural gas commodity costs (recovered through the PGA).

•
Other. For the six months ended June 30, 2026, other gas revenue increased primarily due to customer growth and higher residential customer fixed rate.

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•
Revenue subject to refund. For cost recovery mechanisms, any over-collection of revenues resulting from costs authorized to be collected from customers in rates exceeding actual costs is recorded as a reduction of revenue in the period incurred, as the over-collection is expected to be refunded to customers in a subsequent period. In the year the over-collection is refunded, rates are reduced and offset as revenue subject to refund. There is no net income impact in the year the costs are refunded.

•
Volume. For the six months ended June 30, 2026, retail gas deliveries decreased approximately 3% compared to the same period in the prior year. The decrease was primarily attributable to lower residential use per customer. Unfavorable weather conditions during the first six months of 2026 further contributed to the reduction in volumes.

Cost of gas sold

Cost of gas sold increased $14.8 million during the six months ended June 30, 2026, compared to the same period in the prior year. Cost per therm increased approximately 27%, partially offset by a decrease in therms delivered of approximately 4%. MGE recovers the cost of natural gas in its gas segment through the PGA as described under gas deliveries and revenues above.

Consolidated operations and maintenance expenses

During the six months ended June 30, 2026, operations and maintenance expenses increased $12.5 million, compared to the same period in the prior year. The following contributed to the net change:

(In millions) |  |
Increased administrative and general costs | $ | 7.0
Increased transmission costs |  | 3.2
Increased electric production expenses |  | 2.2
Increased electric distribution expenses |  | 0.5
Decreased other expenses |  | (0.4)
Total | $ | 12.5

•
Increased administrative and general costs are primarily related to increased pension and other postretirement costs. The PSCW has authorized MGE to defer as a regulatory asset or liability, the difference between actual pension and other postretirement costs included in rates and to be recovered or refunded in a future rate proceeding. Pension and other postretirement cost are generally offset by electric revenue and does not have a significant impact on net income.

•
Increased transmission costs are primarily a result of an increase in transmission rate. Transmission costs represent ATC and MISO network transmission expenses authorized to collect in rates. The PSCW has authorized MGE to defer as a regulatory asset or liability, the difference between actual costs included in rates and to be recovered or refunded in a future rate proceeding. Transmission cost is generally offset by electric revenue and does not have a significant impact on net income.

•
Electric production expenses increased primarily due to higher operating and maintenance costs at the Columbia generating station, including boiler plant maintenance and other generation-related expenses, along with increased costs associated with renewable generating facilities.

Consolidated depreciation expense

Electric depreciation expense decreased $0.4 million and gas depreciation expense increased $1.3 million during the six months ended June 30, 2026, compared to the same period in the prior year. In December 2025, the PSCW approved new depreciation rates, which were implemented and became effective as of January 1, 2026. These new rates were the primary driver for the change in depreciation expense.

Electric and gas other income

Electric other income increased $10.9 million and gas other income increased $3.0 million during the six months ended June 30, 2026, compared to the same period in the prior year, driven by a $6.5 million positive impact from non-service costs components of pension and other postretirement costs. The PSCW has authorized MGE to defer as a regulatory asset or liability, the difference between actual pension and other postretirement costs included in rates and to be recovered or refunded in a future rate proceeding. Pension and other postretirement cost is generally offset by electric and gas revenue and does not have a significant

42

impact on net income. Higher AFUDC-Equity due to continued capital investment further contributed to an increase in electric other income.

Nonregulated Energy Operations - MGE Energy and MGE

The nonregulated energy operations are conducted through MGE Energy's subsidiaries: MGE Power Elm Road (the Elm Road Units) and MGE Power West Campus (WCCF), which have been formed to own and lease electric generating capacity to assist MGE. During the six months ended June 30, 2026 and 2025, net income at the nonregulated energy operations segment was $12.8 million and $12.2 million, respectively.

Transmission Investment Operations - MGE Energy

The transmission investment segment holds our interest in ATC and ATC Holdco, and its income reflects our equity in the earnings of those investments. ATC Holdco was formed in December 2016 to pursue transmission development opportunities that typically have long development and investment lead times before becoming operational. During the six months ended June 30, 2026 and 2025, other income at the transmission investment segment primarily reflects ATC's operations and was $7.3 million and $6.2 million, respectively. See Footnote 3 of the Notes to Consolidated Financial Statements in this Report for summarized financial information regarding ATC.

All Other Operations - MGE Energy

Other income

The increase of $3.9 million in other income from all other operations during the six months ended June 30, 2026, primarily reflects results from investment gains recognized in the current year, from venture capital funds. These venture capital investments support early-stage companies working to advance smart technologies, the customer experience, distributed energy resources, electrification, cybersecurity and other priorities for utility companies, such as greater sustainability.

Consolidated Income Taxes - MGE Energy and MGE

See Footnote 4 of the Notes to Consolidated Financial Statements in this Report for the effective tax rate.

Noncontrolling Interest, Net of Tax - MGE

Noncontrolling interest, net of tax, reflects the accounting required for MGE Energy's interest in MGE Power Elm Road (the Elm Road Units) and MGE Power West Campus (WCCF). MGE Energy owns 100% of MGE Power Elm Road and MGE Power West Campus. They are not owned by MGE. Due to the contractual agreements for these projects with MGE, the entities are considered VIEs with respect to MGE and their results are consolidated with those of MGE, the primary beneficiary of the VIEs. The following table shows MGE's noncontrolling interest, net of tax, reflected on MGE's consolidated statement of income:

|  | Six Months Ended |
|  | June 30, |
(In millions) |  | 2026 |  |  | 2025 |
MGE Power Elm Road |  | $ | 7.5 |  |  | $ | 7.7 |
MGE Power West Campus |  |  | 3.8 |  |  |  | 3.6 |

Contractual Obligations and Commercial Commitments - MGE Energy and MGE

There were no material changes, other than from the normal course of business, to MGE Energy's and MGE's contractual obligations (representing cash obligations that are considered to be firm commitments) and commercial commitments (representing commitments triggered by future events) during the six months ended June 30, 2026, except as noted below. Further discussion of the contractual obligations and commercial commitments is included in Footnote 16 of the Notes to Consolidated Financial Statements and "Contractual Obligations and Commercial Commitments for MGE Energy and MGE" under Part II, Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations in the 2025 Annual Report on Form 10-K.

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Purchase Contracts – MGE Energy and MGE

See Footnote 8.c. of Notes to Consolidated Financial Statements in this Report for a description of commitments as of June 30, 2026, that MGE Energy and MGE have entered into with respect to various commodity supply and transportation contracts to meet their obligations to deliver electricity and natural gas to customers.

Liquidity and Capital Resources

MGE Energy and MGE expect to have adequate liquidity to support future operations and capital expenditures over the next twelve months. Available resources include cash and cash equivalents, operating cash flows, liquid assets, borrowing working capacity under revolving credit facilities, and access to equity and debt capital markets, including our at-the-market program. In May 2026, MGE Energy also completed a public offering of common stock, including forward sale agreements that will provide an additional source of liquidity and financial flexibility to support future capital investment needs upon settlement of the shares of common stock sold under the agreements, as described in Footnote 6.c. of the Notes to Consolidated Financial Statements in this Report. The amount and timing of any financings will be primarily driven by capital investments and cash requirements and will depend upon market conditions, regulatory approvals, and other factors. MGE plans to maintain a capital structure consistent with authorized levels approved by its regulator. See "Credit Facilities" under Part II, Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations – Liquidity and Capital Resources in the 2025 Annual Report on Form 10-K for information regarding MGE Energy's and MGE's credit facilities.

Cash Flows

The following summarizes cash flows for MGE Energy and MGE during the six months ended June 30, 2026 and 2025:

|  | MGE Energy |  | MGE
(In thousands) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Cash provided by (used for): |  |  |  |  |  |  |  |  |  |  |  |
Operating activities |  | $ | 148,828 |  | $ | 133,953 |  | $ | 146,450 |  | $ | 127,988
Investing activities |  |  | (216,333) |  |  | (118,254) |  |  | (214,022) |  |  | (112,518)
Financing activities |  |  | 78,452 |  |  | (27,059) |  |  | 76,053 |  |  | (29,437)

Cash Provided by Operating Activities

Cash flows from operating activities for MGE Energy and MGE principally reflect the receipt of customer payments for electric and gas service and outflows related to fuel for electric generation, purchased power, gas, and operation and maintenance expenditures.

The principal increases (decreases) in cash flows from operating activities during the six months ended June 30, 2026, compared to the same period in 2025, were as follows:

(In millions) |  | MGE Energy |  | MGE
Higher overall collections from customers, driven by higher electric and gas rates |  | $ | 38.1 |  | $ | 38.1
Changes in income taxes paid/received - includes proceeds from renewable tax credits transferred to other corporate taxpayers during 2026 of $9.5 million |  |  | 12.1 |  |  | 12.6
Higher payments for fuel and purchased power at our generation plants, as well as higher natural gas costs to our customers |  |  | (20.9) |  |  | (20.9)
Higher payments for other operation and maintenance expenses |  |  | (11.7) |  |  | (9.1)
Higher payments for interest |  |  | (1.9) |  |  | (1.9)
Lower dividend received from ATC |  |  | (0.5) |  |  | —
Other operating activities |  |  | (0.3) |  |  | (0.3)
Increase in cash provided by operating activities |  | $ | 14.9 |  | $ | 18.5

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Capital Requirements and Investing Activities

The principal increases (decreases) in cash flows from investing activities during the six months ended June 30, 2026, compared to the same period in 2025, were as follows:

(In millions) |  | MGE Energy |  | MGE
Capital expenditures, primarily reflects an increase in electric and gas utility expenditures, specifically related to spending for Sunnyside, Dawn Harvest, Saratoga, and local battery storage construction |  | $ | (99.2) |  | $ | (99.2)
Capital contributions to ATC and other investments |  |  | (1.8) |  |  | —
Proceeds from the sale of investments |  |  | 5.3 |  |  | —
Other investing activities |  |  | (2.4) |  |  | (2.3)
Decrease in cash flows from investing activities |  | $ | (98.1) |  | $ | (101.5)

Cash Used for Financing Activities

The principal sources and uses of cash are related to short-term and long-term borrowings and repayments and the payment of cash dividends.

The principal increases (decreases) in cash flows from financing activities during the six months ended June 30, 2026, compared to the same period in 2025, were as follows:

(In millions) |  | MGE Energy |  | MGE
Change in long-term debt(a) |  | $ | 88.7 |  | $ | 88.7
Higher issuance of common stock |  |  | 85.1 |  |  | —
Higher cash distribution from parent (MGE Energy) |  |  | — |  |  | 77.5
Lower cash dividends to parent (MGE Energy) |  |  | — |  |  | 5.5
Change in short-term debt borrowings, net |  |  | (65.3) |  |  | (65.3)
Higher cash dividends paid, dividend rate per share ($0.950 vs. $0.900) |  |  | (2.4) |  |  | —
Higher distributions to parent (MGE Energy) from noncontrolling interest, representing distributions from MGE Power Elm Road and MGE Power West Campus(b) |  |  | — |  |  | (0.3)
Other financing activities |  |  | (0.6) |  |  | (0.6)
Increase in cash flows from financing activities |  | $ | 105.5 |  | $ | 105.5

(a)
In January 2026, MGE issued $90 million of senior unsecured notes that were used to assist with financing additional capital expenditures and other corporate obligations. In January 2026, MGE completed a redemption of $1.2 million of its outstanding first mortgage bonds.

(b) The noncontrolling interest arises from the accounting required for the entities, which are not owned by MGE but are consolidated as VIEs.

Capitalization Ratios

MGE Energy's capitalization ratios were as follows:

|  | MGE Energy
|  | June 30, 2026 |  | December 31, 2025
Common shareholders' equity |  | 60.7% |  | 58.9%
Long-term debt(a) |  | 37.9% |  | 36.8%
Short-term debt |  | 1.4% |  | 4.3%

(a)
Includes the current portion of long-term debt.

Credit Ratings

MGE Energy's and MGE's access to the capital markets, including, in the case of MGE, the commercial paper market, and their respective financing costs in those markets, may depend on the credit ratings of the entity that is accessing the capital markets.

None of MGE Energy's or MGE's borrowing is subject to default or prepayment as a result of a downgrading of credit ratings, although a downgrading of MGE's credit ratings would increase fees and interest charges under both MGE Energy's and MGE's credit agreements and may affect the collateral required to be posted under derivative transactions.

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Environmental Matters

See the discussion of environmental matters included in the 2025 Annual Report on Form 10-K, as updated by Footnote 8.a. of Notes to Consolidated Financial Statements in this Report.

Othe r Matters

Rate Matters

In December 2025, the PSCW approved a settlement agreement for MGE's 2026/2027 rate case. As part of that settlement agreement, the PSCW approved a 0.15% increase for electric rates and a 2.77% increase to gas rates for 2026 and a 3.63% increase for electric rates and a 2.04% increase to gas rates for 2027. MGE filed a 2027 Fuel Cost Plan with the PSCW in June 2026. MGE expects a final decision from the PSCW on the Fuel Cost Plan by the end of 2026.

Details related to MGE's 2026/2027 settlement are as follows:

(Dollars in thousands) |  | Average Rate Base(a) |  | Average CWIP(b) |  | Return on Common Equity(c) |  | Common Equity Component of Regulatory Capital Structure |  | Effective Date
Electric (2026 Test Period) |  | $ | 1,346,269 |  | $ | 37,232 |  | 9.8% |  | 56.09% |  | 1/1/2026
Gas (2026 Test Period) |  | $ | 375,594 |  | $ | 7,764 |  | 9.8% |  | 56.09% |  | 1/1/2026
Electric (2027 Test Period) |  | $ | 1,537,938 |  | $ | 33,082 |  | 9.8% |  | 56.05% |  | 1/1/2027
Gas (2027 Test Period) |  | $ | 393,558 |  | $ | 8,912 |  | 9.8% |  | 56.05% |  | 1/1/2027

(a)
Average rate base amounts reflect MGE's allocated share of rate base and do not include construction work in progress (CWIP) or a cash working capital allowance and were calculated using a forecasted 13-month average for the test periods. The PSCW provides a return on selected CWIP and a cash working capital allowance by adjusting the percentage return on rate base.
(b)
50% of the forecasted 13-month average CWIP for the test periods earns an AFUDC return. Projects eligible to earn 100% AFUDC are excluded from this balance and discussed further in the Management's Discussion and Analysis of Financial Condition and Results of Operations - Significant Events section.
(c)
Returns on common equity may not be indicative of actual returns earned or projections of future returns, as actual returns will be affected by the volume of electricity or gas sold.

See Footnote 9 of Notes to Consolidated Financial Statements in this Report for further discussion of rate proceedings and an earnings sharing mechanism if MGE earns above the authorized return on common equity in the rate order.

Uyghur Forced Labor Prevention Act

The UFLPA, a federal law that became effective in June 2022, prohibits importation of goods, including silica-based products used in the production of solar panels, that are mined, produced, or manufactured wholly or in part in China’s Xinjiang Uyghur Autonomous Region. Suppliers for MGE's current solar projects were able to provide the CBP sufficient documentation to meet WRO and UFLPA compliance requirements, however we cannot currently predict what, if any, impact the UFLPA will have on the overall supply of solar panels into the United States and the related impact to timing and cost of solar projects included in our capital plan. In the event that such disruptions increase costs beyond approved levels, we have filed and expect to continue filing notifications with the PSCW and will seek recovery of those costs in future rate proceedings.

The UFLPA Entity List continues to expand, including entities participating in solar and solar supply chain activities. MGE continues to monitor developments related to the UFLPA, evaluate supplier compliance, and assess potential impacts to current and future projects.

U.S. Department of Commerce - Solar Cells and Modules

In June 2024, following AD/CVD investigations by the DOC and the USITC determining that Chinese manufacturers were circumventing tariffs on solar panels by shipping them through Cambodia, Malaysia, Thailand, and Vietnam, the DOC began applying tariffs to the importation of solar cells from those countries. In the second quarter of 2025, the DOC and USITC issued final determinations affirming and increasing the tariffs. Later that year, the U.S. Court of International Trade ruled that the prior two-year moratorium was unlawful, permitting retroactive collection, though the ruling has been stayed pending appeal to the Federal Circuit.

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In late 2025, the DOC initiated new AD/CVD investigations into solar imports from India, Indonesia, and Laos. In February and April 2026, the DOC issued preliminary affirmative determinations in the CVD and AD investigations, respectively, resulting in increased preliminary tariff rates. The investigations remain ongoing, and final determinations are expected later in 2026. Additionally, a new 'Section 232' national security investigation into the global polysilicon supply chain was launched in late 2025, which could result in broad, global tariffs on solar components regardless of their country of origin.

MGE continues to assess the potential impact of these tariffs on current and future solar projects, which may result in increased costs, delays in construction timelines, or a new and potentially material financial liability due to retroactive tariffs. In the event that such disruptions increase costs beyond approved levels, we have filed and expect to continue filing notifications with the PSCW and will seek recovery of those costs in future rate proceedings.

Tariffs

U.S. and international trade policies, including tariffs, port fees, trade sanctions, and other import/export regulations, continue to evolve, influenced by geopolitical developments and economic priorities. MGE is proactively evaluating the potential effects of these changes on operating costs and capital investments, particularly for renewable energy and battery storage initiatives. Such policy shifts could lead to higher costs or delays in project timelines.

Tax Update - One Big Beautiful Bill Act

In July 2025, the OBBBA was signed into law, introducing significant changes to tax credits and compliance requirements. The OBBBA accelerates the termination of the Clean Electricity PTC and ITC for wind and solar projects placed in service after 2027. Pursuant to the OBBBA, the July 4, 2026 commencement-of-construction deadline for wind and solar projects has passed, and projects that did not begin construction by that date generally must be placed in service by December 31, 2027 to remain eligible for these credits. The phase out of PTCs and ITCs does not apply to energy storage, hydroelectric facilities, nuclear, or any other zero emission technology. The OBBBA imposes restrictions on credit eligibility, disallowing credits, and foreign entity material assistance. The Treasury Department issued new beginning-of-construction guidance in August 2025. However, a federal court vacated the guidance in June 2026, reinstating the prior physical work and 5% safe harbor framework, subject to further developments. Interim guidance has also been released on domestic content requirements. MGE has evaluated the impact of the OBBBA and will continue monitoring Treasury Department updates and engaging with industry groups to ensure compliance.

Adoption of Accounting Principles and Recently Issued Accounting Pronouncements

See Footnote 2 of Notes to Consolidated Financial Statements in this Report for discussion of new accounting pronouncements.

## Item 3. Quantitative and Qualitative Disclosures About Market Risk.

There were no material changes to the market risks disclosed in Item 7A. Quantitative and Qualitative Disclosures About Market Risk in our 2025 Annual Report on Form 10-K.

##

## Item 4. Controls and Procedures.

During the second quarter of 2026, each registrant's management, including the principal executive officer and principal financial officer, evaluated its disclosure controls and procedures related to the recording, processing, summarization, and reporting of information in its periodic reports that it files with the SEC. These disclosure controls and procedures have been designed to ensure that material information relating to that registrant, including its subsidiaries, is accumulated and made known to that registrant's management, including these officers, by other employees of that registrant and its subsidiaries as appropriate to allow timely decisions regarding required disclosure, and that this information is recorded, processed, summarized, evaluated, and reported, as applicable, within the time periods specified in the SEC's rules and forms. The evaluations take into account changes in the internal and external operating environments that may impact those controls and procedures. Due to the inherent limitations of control systems, not all misstatements may be detected. These inherent limitations include the realities that judgments in decision making can be faulty and breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. Also, MGE Energy does not control or manage certain of its unconsolidated entities and thus, its access and ability to apply its procedures to those entities is more limited than is the case for its consolidated subsidiaries.

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As of June 30, 2026, each registrant's principal executive officer and principal financial officer concluded that its disclosure controls and procedures were effective. Each registrant intends to strive continually to improve its disclosure controls and procedures to enhance the quality of its financial reporting.

During the quarter ended June 30, 2026, there were no changes in either registrant's internal controls over financial reporting that materially affected, or are reasonably likely to materially affect, that registrant's internal control over financial reporting.

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## PART II. O THER INFORMATION.

## Item 1. Leg al Proceedings.

MGE Energy and its subsidiaries, including MGE, from time to time are involved in various legal proceedings that are handled and defended in the ordinary course of business. See Footnotes 8.a. and 8.b. of Notes to Consolidated Financial Statements in this Report for more information.

Item 1 A. Risk Factors.

There were no material changes from the risk factors disclosed in Item 1A. Risk Factors in our 2025 Annual Report on Form 10-K, other than as set forth below:

We have in the past entered, and may in the future enter, into forward sale transactions that subject us to certain risks.

We have previously entered into forward sale agreements and may in the future enter into additional forward sale agreements that subject us to certain risks. The future issuance of any shares of common stock upon settlement of any forward sale agreement will result in dilution to our earnings per share, return on equity, and dividends per share. The purchase of common stock in connection with the unwinding of the forward purchaser's hedge position could cause our stock price to increase (or prevent a decrease) over such time, thereby increasing the amount of cash we would owe (or decreasing the amount of cash owed to us) upon a cash settlement. In addition, pursuant to each forward sale agreement, the relevant forward purchaser will have the right to accelerate the settlement of the forward sale agreement in connection with certain specified events. In such cases, we could be required to settle that particular forward sale agreement and issue common stock irrespective of our capital needs.

## Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

## None.

##

## Item 3. Defaults Upon Senior Securities.

##

## None.

##

## Item 4. Mine Sa fety Disclosures.

Not applicable to MGE Energy and MGE.

## Item 5. Other Inf ormation.

During the three months ended June 30, 2026, no director or officer of MGE Energy or MGE adopted or terminated a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement, as each term is defined in Item 408(a) of Regulation S-K.

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## Item 6. Ex hibits.

Ex. No. |  | Exhibit Description
10.1 | *** | Form of Restricted Stock Award Agreement for Employees pursuant to the MGE Energy Inc., 2021 Long-Term Incentive Plan, April 2026
10.2 |  | Forward Sale Agreement, dated May 6, 2026, by and between MGE Energy, Inc. and Morgan Stanley & Co. LLC (incorporated by reference to Exhibit 10.1 of Current Report on Form 8-K filed by MGE Energy, Inc. on May 8, 2026)
10.3 |  | Forward Sale Agreement, dated May 6, 2026, by and between MGE Energy, Inc. and Bank of America, N.A. (incorporated by reference to Exhibit 10.2 of Current Report on Form 8-K filed by MGE Energy, Inc. on May 8, 2026)
10.4 |  | Forward Sale Agreement, dated May 6, 2026, by and between MGE Energy, Inc. and JPMorgan Chase Bank, National Association (incorporated by reference to Exhibit 10.3 of Current Report on Form 8-K filed by MGE Energy, Inc. on May 8, 2026)
31.1 | * | Certifications Pursuant to Rules 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934 filed by Jeffrey M. Keebler for MGE Energy, Inc.
31.2 | * | Certifications Pursuant to Rules 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934 filed by Jared J. Bushek for MGE Energy, Inc.
31.3 | * | Certifications Pursuant to Rules 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934 filed by Jeffrey M. Keebler for Madison Gas and Electric Company
31.4 | * | Certifications Pursuant to Rules 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934 filed by Jared J. Bushek for Madison Gas and Electric Company
32.1 | ** | Certifications Pursuant to Section 1350 of Chapter 63 of Title 18 United States Code (Sarbanes-Oxley Act of 2002) filed by Jeffrey M. Keebler for MGE Energy, Inc.
32.2 | ** | Certifications Pursuant to Section 1350 of Chapter 63 of Title 18 United States Code (Sarbanes-Oxley Act of 2002) filed by Jared J. Bushek for MGE Energy, Inc.
32.3 | ** | Certifications Pursuant to Section 1350 of Chapter 63 of Title 18 United States Code (Sarbanes-Oxley Act of 2002) filed by Jeffrey M. Keebler for Madison Gas and Electric Company
32.4 | ** | Certifications Pursuant to Section 1350 of Chapter 63 of Title 18 United States Code (Sarbanes-Oxley Act of 2002) filed by Jared J. Bushek for Madison Gas and Electric Company
101.INS | * | XBRL Instance
101.SCH | * | XBRL Taxonomy Extension Schema With Embedded Linkbases Document
101.CAL | * | Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB | * | Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE | * | Inline XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF | * | Inline XBRL Taxonomy Extension Definitions Linkbase Document
104.1 | * | Included in the cover page, formatted in Inline XBRL
* |  | Filed herewith.
** |  | Furnished herewith.
*** |  | Indicates a management contract or compensatory plan or arrangement.

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## Signatures - MGE Energy, Inc.

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

| MGE ENERGY, INC.
Date: August 5, 2026 | /s/ Jeffrey M. Keebler
| Jeffrey M. Keebler Chairman, President and Chief Executive Officer (Duly Authorized Officer)
Date: August 5, 2026 | /s/ Jared J. Bushek
| Jared J. Bushek Executive Vice President - Chief Financial Officer and Treasurer (Chief Financial Officer)
Date: August 5, 2026 | /s/ Jenny L. Lagerwall
| Jenny L. Lagerwall Assistant Vice President - Accounting and Controller (Chief Accounting Officer)

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## Signatures – Madison Gas and Electric Company

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

| MADISON GAS AND ELECTRIC COMPANY
Date: August 5, 2026 | /s/ Jeffrey M. Keebler
| Jeffrey M. Keebler Chairman, President and Chief Executive Officer (Duly Authorized Officer)
Date: August 5, 2026 | /s/ Jared J. Bushek
| Jared J. Bushek Executive Vice President - Chief Financial Officer and Treasurer (Chief Financial Officer)
Date: August 5, 2026 | /s/ Jenny L. Lagerwall
| Jenny L. Lagerwall Assistant Vice President - Accounting and Controller (Chief Accounting Officer)

52