Private company

SOUTHERN POWER CO

SOUTHERN POWER CO is an electric services company.1 It is headquartered in Atlanta, Georgia.1

Last updated Oct 21, 2026.

Overview

  • IndustryElectric Services1
  • HeadquartersAtlanta, Georgia1
  • Business address30 Ivan Allen Jr. Blvd, Atlanta, Ga 303082

When used in this Form 10-K, the following terms will have the meanings indicated.4 From its latest annual report

Corporate structure

SOUTHERN POWER CO is part of a group headed by Southern Company. 142 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

  • Southern Company Atlanta, Georgia, United States
    • Georgia Power 100% · Atlanta, Georgia, United States
    • Mississippi Power 100% · Gulfport, Mississippi, United States
    • AGL Resources Atlanta, Georgia, United States
      • CENTRAL VALLEY GAS STORAGE, L.L.C. Subsidiary · Atlanta, Georgia, United States
      • GOLDEN TRIANGLE STORAGE, LLC Subsidiary · Wilmington, Delaware, United States
      • JEFFERSON ISLAND STORAGE & HUB L.L.C. Subsidiary · Houston, Texas, United States
      • NICOR ENERCHANGE, L.L.C. Subsidiary · Houston, Texas, United States
      • NORTHERN ILLINOIS GAS COMPANY Subsidiary · Naperville, Illinois, United States
      • SOUTHERN COMPANY GAS CAPITAL CORPORATION Subsidiary · Birmingham, Alabama, United States
      • SOUTHSTAR ENERGY SERVICES LLC Subsidiary · Wilmington, Delaware, United States
        • ILLINOIS ENERGY SOLUTIONS, USA, LLC Subsidiary · Wilmington, Delaware, United States
        • ILLINOIS ENERGY, USA, LLC Subsidiary · Atlanta, Georgia, United States
      • VIRGINIA NATURAL GAS, INC. Subsidiary · Virginia Beach, Virginia, United States
    • SOUTHERN POWER CO Atlanta, Georgia
      • Adobe Solar, LLC Subsidiary · Delaware, United States
      • Alabama Property Company Subsidiary · Alabama, United States
      • Apex Nevada Solar, LLC Subsidiary · Delaware, United States
      • Atlanta Gas Light Company Subsidiary · Georgia, United States
      • Beech Ridge Energy II Holdings, LLC Subsidiary · Delaware, United States
      • Beech Ridge Energy II, LLC Subsidiary · Delaware, United States
      • Bethel Wind Farm Class B Holdings LLC Subsidiary · Delaware, United States
      • Bethel Wind Farm Holdings LLC Subsidiary · Delaware, United States
      • Bethel Wind Farm LLC Subsidiary · Delaware, United States
      • Blackwell Solar Holdings, LLC Subsidiary · Delaware, United States
      • Blackwell Solar, LLC Subsidiary · Delaware, United States
      • BNB Lamesa Solar, LLC Subsidiary · Delaware, United States
      • Boulder Solar Power Parent, LLC Subsidiary · Delaware, United States
      • Boulder Solar Power, LLC Subsidiary · Delaware, United States
      • BSP Holding Company, LLC Subsidiary · Delaware, United States
      • Cactus Flats Holdings, LLC Subsidiary · Delaware, United States
      • Calipatria, LLC Subsidiary · Delaware, United States
      • Campo Verde Solar, LLC Subsidiary · Delaware, United States
      • Desert Stateline Holdings, LLC Subsidiary · Delaware, United States
      • Desert Stateline, LLC Subsidiary · Delaware, United States
      • Deuel Harvest Wind Energy Holdings, LLC Subsidiary · Delaware, United States
      • Deuel Harvest Wind Energy, LLC Subsidiary · Delaware, United States
      • Diamond State Generation Partners, LLC Subsidiary · Delaware, United States
      • East Pecos Solar, LLC Subsidiary · Delaware, United States
      • Evergreen Enterprise Holdings LLC Subsidiary · Georgia, United States
      • and 87 more
    • Southern Nuclear Subsidiary · 100% · Birmingham
    • Southern Linc Subsidiary · Atlanta
    • Alabama Power Company Subsidiary · 100% · Birmingham, Alabama, United States
    • ENERGY RESOURCE INSURANCE CORPORATION Subsidiary · Atlanta, Georgia, United States
    • Southern Electric Generating Company Subsidiary · Birmingham, Alabama, United States
    • SOUTHERN POWER COMPANY Subsidiary · Atlanta, Georgia, United States
      • GLASS SANDS WIND ENERGY, LLC Subsidiary · Atlanta, Georgia, United States
      • GRANT PLAINS WIND, LLC Subsidiary · Atlanta, Georgia, United States
      • MILLERS BRANCH SOLAR, LLC Subsidiary · Atlanta, Georgia, United States
      • PASSADUMKEAG WINDPARK, LLC Subsidiary · Wilmington, Delaware, United States
      • READING WIND ENERGY, LLC Subsidiary · Wilmington, Delaware, United States
      • SALT FORK WIND, LLC Subsidiary · Atlanta, Georgia, United States
      • SP ENERGY TRADING, LLC Subsidiary · Atlanta, Georgia, United States
      • TYLER BLUFF WIND PROJECT, LLC Subsidiary · Wilmington, Delaware, United States
      • WAKE WIND ENERGY LLC Subsidiary · Wilmington, Delaware, United States

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries listed in Exhibit 21 of annual reports filed with the SEC; subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

What it owns

What SOUTHERN POWER CO reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.

Properties, in its own words

At December 31, 2025, the traditional electric operating companies, Southern Power, and SEGCO owned and/or operated the generating and battery energy storage facilities listed in the table below. The traditional electric operating companies have certain jointly-owned generating stations. For these facilities, the nameplate capacity shown represents the Registrant's portion of total plant capacity, with ownership percentages provided if less than 100%. See "Jointly-Owned Facilities" and "Titles to Property" herein and Note 5 to the financial statements under "Joint Ownership Agreements" in Item 8 herein for additional information.

Barry Units 6 through 8 · Mobile, AL · 1,706,424

The rest of Item 2

Central Alabama Generating Station · Autauga County, AL · 885,000

Lindsay Hill Generating Station · Autauga County, AL · 879,700

Calhoun Generating Station · Calhoun County, AL · 748,000

Greene County · Demopolis, AL · 720,000

Barry Units 1, 2, and 4 · Mobile, AL · 600,000

Greene County Units 1 and 2 (60%) · Demopolis, AL · 300,000

Total Natural Gas · 5,839,124

Barry Unit 5 · Mobile, AL · 700,000

Gaston Unit 5 · Wilsonville, AL · 880,000

Miller (91.8% of Units 1 and 2 and 100% of Units 3 and 4) · Birmingham, AL · 2,532,288

Total Coal · 4,112,288

Nuclear

Farley · Dothan, AL · 1,720,000

Anniston Army Depot · Calhoun County, AL · 7,380

Fort Rucker · Dale County, AL · 10,560

Total Solar · 17,940

Hydro

Bankhead · Holt, AL · 53,985

Bouldin · Wetumpka, AL · 225,000

Harris · Wedowee, AL · 132,000

Henry · Ohatchee, AL · 72,900

Holt · Holt, AL · 46,944

Jordan · Wetumpka, AL · 100,000

Lay · Clanton, AL · 177,000

Lewis Smith · Jasper, AL · 157,500

Logan Martin · Vincent, AL · 135,000

Martin · Dadeville, AL · 182,000

Mitchell · Verbena, AL · 170,000

Thurlow · Tallassee, AL · 81,000

Weiss · Leesburg, AL · 87,750

Yates · Tallassee, AL · 47,000

Total Hydro · 1,668,079

Cogeneration

Lowndes County · Burkeville, AL · 104,800

Theodore · Theodore, AL · 236,418

Washington County · Washington County, AL · 123,428

Total Cogeneration · 464,646

Total Alabama Power Generating Capacity · 13,822,077

McDonough-Atkinson Units 4 through 6 · Atlanta, GA · 2,520,000

McIntosh Units 10 and 11 · Effingham County, GA · 1,318,920

McDonough Unit 3 · Atlanta, GA · 78,800

McIntosh Units 1 through 8 · Effingham County, GA · 640,000

McManus · Brunswick, GA · 481,700

Robins · Warner Robins, GA · 158,400

Wilson · Augusta, GA · 354,100

Yates · Newnan, GA · 700,000

Total Natural Gas · 6,251,920

Bowen · Cartersville, GA · 3,160,000

Scherer (8.4% of Units 1 and 2 and 75% of Unit 3) · Macon, GA · 750,924

Total Coal · 3,910,924

Nuclear

Hatch (50.1%) · Baxley, GA · 899,612

Vogtle (45.7%) · Augusta, GA · 2,167,094

Total Nuclear · 3,066,706

Fort Benning · Columbus, GA · 30,005

Fort Gordon · Augusta, GA · 30,000

Fort Stewart · Fort Stewart, GA · 30,000

Fort Valley · Fort Valley, GA · 10,800

Kings Bay · Camden County, GA · 30,161

Marine Corps Logistics Base · Albany, GA · 31,161

McIntosh · Effingham County, GA · 10,000

Moody Air Force Base · Valdosta, GA · 49,500

Robins Air Force Base · Warner Robins, GA · 128,000

8 Other Plants · Various Georgia locations · 18,479

Total Solar · 368,106

Hydro

Bartletts Ferry · Columbus, GA · 173,000

Burton · Clayton, GA · 8,100

Flint River · Albany, GA · 5,400

Goat Rock · Columbus, GA · 40,500

Lloyd Shoals · Jackson, GA · 18,000

Morgan Falls · Atlanta, GA · 16,800

Nacoochee · Lakemont, GA · 4,800

North Highlands · Columbus, GA · 29,600

Oliver Dam · Columbus, GA · 60,000

Rocky Mountain (25.4%) · Rome, GA · 229,362 · (b)

Sinclair Dam · Milledgeville, GA · 45,000

Tallulah Falls · Clayton, GA · 72,000

Terrora · Clayton, GA · 20,800

Tugalo · Clayton, GA · 59,250

Wallace Dam · Eatonton, GA · 321,300

Yonah · Toccoa, GA · 22,500

Total Hydro · 1,126,412

Mossy Branch · Talbot County, GA · 65,000

Total Georgia Power Generating Capacity · 14,789,068

Daniel · Pascagoula, MS · 1,070,424

Ratcliffe · Kemper County, MS · 769,898

Sweatt · Meridian, MS · 39,400

Watson · Gulfport, MS · 39,360

Greene County Units 1 and 2 (40%) · Demopolis, AL · 200,000

Watson · Gulfport, MS · 750,000

Total Natural Gas · 2,869,082

Daniel · Pascagoula, MS · 1,000,000

Walnut Grove · Walnut Grove, MS · 1,500

Cogeneration

Chevron Cogenerating Station · Pascagoula, MS · 147,292 · (c)

Total Mississippi Power Generating Capacity · 4,017,874

Franklin · Smiths, AL · 1,857,820

Harris · Autaugaville, AL · 1,318,920

Rowan Unit 4 · Salisbury, NC · 530,550

Wansley Units 6 and 7 · Carrollton, GA · 1,073,000

Addison · Thomaston, GA · 668,800

Cleveland · Cleveland County, NC · 720,000

Dahlberg · Jackson County, GA · 756,000

Rowan Units 1 through 3 · Salisbury, NC · 455,250

Total Natural Gas · 7,380,340

Adobe · Kern County, CA · 20,000

Apex · North Las Vegas, NV · 20,000

Boulder I · Clark County, NV · 100,000

Butler · Taylor County, GA · 104,000

Butler Solar Farm · Taylor County, GA · 22,000

Calipatria · Imperial County, CA · 20,000

Campo Verde · Imperial County, CA · 147,420

Cimarron · Colfax County, NM · 30,640

Decatur County · Decatur County, GA · 20,000

Decatur Parkway · Decatur County, GA · 84,000

Desert Stateline · San Bernadino County, CA · 299,990

East Pecos · Pecos County, TX · 120,000

Garland · Kern County, CA · 205,290

Gaskell West I · Kern County, CA · 20,000

Granville · Granville County, NC · 2,500

Henrietta · Kings County, CA · 102,000

Imperial Valley · Imperial County, CA · 163,200

Lamesa · Dawson County, TX · 102,000

Lost Hills-Blackwell · Kern County, CA · 32,000

Macho Springs · Luna County, NM · 55,000

Morelos del Sol · Kern County, CA · 15,000

North Star · Fresno County, CA · 61,600

Pawpaw · Taylor County, GA · 30,480

Roserock · Pecos County, TX · 160,000

Rutherford · Rutherford County, NC · 74,800

Sandhills · Taylor County, GA · 148,000

South Cheyenne · Laramie County, WY · 150,000

Spectrum · Clark County, NV · 30,240

Item 2 of the 10-K filed Feb 19, 2026.4

Subsidiaries and ownership

Subsidiaries (Exhibit 21)

  • Adobe Solar, LLC Delaware3
  • Alabama Power Company Alabama3
  • Alabama Property Company Alabama3
  • Apex Nevada Solar, LLC Delaware3
  • Atlanta Gas Light Company Georgia3
  • BNB Lamesa Solar, LLC Delaware3
  • BSP Holding Company, LLC Delaware3
  • Beech Ridge Energy II Holdings, LLC Delaware3
  • Beech Ridge Energy II, LLC Delaware3
  • Bethel Wind Farm Class B Holdings LLC Delaware3
  • Bethel Wind Farm Holdings LLC Delaware3
  • Bethel Wind Farm LLC Delaware3
  • Blackwell Solar Holdings, LLC Delaware3
  • Blackwell Solar, LLC Delaware3
  • Boulder Solar Power Parent, LLC Delaware3
  • Boulder Solar Power, LLC Delaware3
  • Cactus Flats Holdings, LLC Delaware3
  • Calipatria, LLC Delaware3
  • Campo Verde Solar, LLC Delaware3
  • Desert Stateline Holdings, LLC Delaware3
  • Desert Stateline, LLC Delaware3
  • Deuel Harvest Wind Energy Holdings, LLC Delaware3
  • Deuel Harvest Wind Energy, LLC Delaware3
  • Diamond State Generation Partners, LLC Delaware3
All 118 listed subsidiaries
  • East Pecos Solar, LLC Delaware3
  • Evergreen Enterprise Holdings LLC Georgia3
  • Georgia Natural Gas Company Georgia3
  • Georgia Power Company Georgia3
  • Glass Sands Wind Energy, LLC Delaware3
  • Grant County Interconnect, LLC Delaware3
  • Grant Plains Wind, LLC Delaware3
  • Grant Wind, LLC Delaware3
  • Granville Solar, LLC Delaware3
  • Kay Wind, LLC Delaware3
  • Lost Hills Blackwell Holdings, LLC Delaware3
  • Lost Hills Solar Holdco, LLC Delaware3
  • Lost Hills Solar, LLC Delaware3
  • Macho Springs Solar 2, LLC Delaware3
  • Macho Springs Solar, LLC Delaware3
  • Millers Branch Solar, LLC Delaware3
  • Mississippi Power Company Mississippi3
  • Morelos Solar, LLC Delaware3
  • NS Solar Holdings, LLC Delaware3
  • North Star Solar, LLC Delaware3
  • Northern Illinois Gas Company Illinois3
  • Ottawa Acquisition LLC Illinois3
  • Parrey Holding Company, LLC Delaware3
  • Parrey Parent, LLC Delaware3
  • Parrey, LLC Delaware3
  • Passadumkeag Windpark, LLC Delaware3
  • RE Garland A, LLC Delaware3
  • RE Garland Holdings LLC Delaware3
  • RE Garland, LLC Delaware3
  • RE Gaskell West 1, LLC Delaware3
  • RE Roserock Holdings, LLC Delaware3
  • RE Roserock LLC Delaware3
  • RE Silverlake Holdings, LLC Delaware3
  • RE Tranquillity BAAH, LLC Delaware3
  • RE Tranquillity Holdings, LLC Delaware3
  • RE Tranquillity, LLC Delaware3
  • Reading Wind Energy Class B Holdings, LLC Delaware3
  • Reading Wind Energy Holdings, LLC Delaware3
  • Reading Wind Energy, LLC Delaware3
  • Rutherford Farm, LLC Delaware3
  • SG2 Holdings, LLC Delaware3
  • SG2 Imperial Valley LLC Delaware3
  • SP Butler Solar Farm, LLC Delaware3
  • SP Butler Solar, LLC Delaware3
  • SP Cactus Flats Class B Holdings, LLC Delaware3
  • SP Cactus Flats Wind Energy, LLC Delaware3
  • SP Cimarron Capital, LLC Delaware3
  • SP Cimarron I, LLC Delaware3
  • SP Decatur County Solar, LLC Delaware3
  • SP Decatur Parkway Solar, LLC Delaware3
  • SP Deuel Harvest Wind Energy Class B Holdings, LLC Delaware3
  • SP Deuel Harvest Wind Energy Holdings, LLC Delaware3
  • SP Diamond State Class B Holdings, LLC Delaware3
  • SP Garland Solar Storage, LLC Delaware3
  • SP Gaskell West 1 Class B Holdings, LLC Delaware3
  • SP Gaskell West 1 Holdings, LLC Delaware3
  • SP Pawpaw Solar, LLC Delaware3
  • SP Roserock Investment, Inc. Delaware3
  • SP Sandhills Solar, LLC Delaware3
  • SP Skookumchuck Holdings, LLC Delaware3
  • SP Skookumchuck Investment, LLC Delaware3
  • SP Skookumchuck Wind Energy Project, LLC Delaware3
  • SP Solar Farms, LLC Delaware3
  • SP Solar GP, Inc. Delaware3
  • SP Solar Holdings I, LP Delaware3
  • SP Solar Storage Class B Holdings, LLC Delaware3
  • SP Solar Storage OpCo, LLC Delaware3
  • SP TEP Class B Holdings I, Inc. Delaware3
  • SP TEP Formations, Inc. Delaware3
  • SP Tranquillity Solar Storage, LLC Delaware3
  • SP Wildhorse Class B Holdings, LLC Delaware3
  • SP Wildhorse Holdings, LLC Delaware3
  • SP Wind Development Holdings, LLC Delaware3
  • SP Wind Holdings II, LLC Delaware3
  • Salt Fork Wind, LLC Delaware3
  • South Cheyenne Solar, LLC Delaware3
  • SouthStar Energy Services LLC Delaware3
  • Southern Company Gas Georgia3
  • Southern Company Gas Capital Corporation Alabama3
  • Southern Company Gas Investments, Inc. Georgia3
  • Southern Company Gas Pipeline Holdings LLC Georgia3
  • Southern Electric Generating Company Alabama3
  • Southern Power Company Delaware3
  • Southern Renewable Energy, Inc. Delaware3
  • Southern Renewable Partnerships, LLC Delaware3
  • Spectrum Nevada Solar, LLC Delaware3
  • The Southern Company Delaware3
  • Tyler Bluff Wind Project, LLC Delaware3
  • Virginia Natural Gas, Inc. Georgia3
  • WWH LLC Delaware3
  • Wake Wind Class B Holdings LLC Delaware3
  • Wake Wind Energy LLC Delaware3
  • Wake Wind Holdings LLC Delaware3
  • Wildhorse Wind Energy, LLC Delaware3

The subsidiaries the company lists in Exhibit 21 of its annual report, as filed.

Timeline

  1. Jul 30, 20268-K Results of operations5
  2. Jun 4, 20268-K Other events6
  3. Apr 30, 20268-K Results of operations7
  4. Feb 19, 20268-K Results of operations8
  5. Oct 30, 20258-K Results of operations9
  6. Sep 19, 20258-K Other events10
  7. Jul 31, 20258-K Results of operations11
  8. May 1, 20258-K Results of operations12
  9. Feb 20, 20258-K Results of operations13
  10. Oct 31, 20248-K Results of operations14
  11. Aug 1, 20248-K Results of operations15
  12. May 2, 20248-K Results of operations16

Calendar

Coming up

  1. Around Oct 29, 2026Next results, estimated About a quarter after its last report. The company hasn't announced the date.

When it reported results

  1. Jul 30, 2026Reported quarterly or annual results5
  2. Apr 30, 2026Reported quarterly or annual results7
  3. Feb 19, 2026Reported quarterly or annual results8
  4. Oct 30, 2025Reported quarterly or annual results9
  5. Jul 31, 2025Reported quarterly or annual results11
  6. May 1, 2025Reported quarterly or annual results12
  7. Feb 20, 2025Reported quarterly or annual results13
  8. Oct 31, 2024Reported quarterly or annual results14

Upcoming dates from Nasdaq's calendar; past results from the company's 8-K filings (Item 2.02). The full markets calendar

Filings

60 filings to the SEC since October 2021: 5 annual reports, 15 quarterly reports, 22 major events, 18 other. The latest 20:

  1. Aug 19, 2026S-3ASR EDGAR
  2. Jul 30, 20268-K EDGAR
  3. Jul 30, 202610-Q EDGAR
  4. Jun 4, 20268-K EDGAR
  5. Jun 2, 2026424B2 EDGAR
  6. Jun 1, 2026FWP EDGAR
  7. Jun 1, 2026424B5 EDGAR
  8. Apr 30, 20268-K EDGAR
  9. Apr 30, 202610-Q EDGAR
  10. Feb 19, 20268-K EDGAR
  11. Feb 19, 202610-K EDGAR
  12. Oct 30, 20258-K EDGAR
  13. Oct 30, 202510-Q EDGAR
  14. Sep 19, 20258-K EDGAR
  15. Sep 17, 2025424B2 EDGAR
  16. Sep 17, 2025424B2 EDGAR
  17. Sep 16, 2025FWP EDGAR
  18. Sep 16, 2025FWP EDGAR
  19. Sep 16, 2025424B5 EDGAR
  20. Sep 16, 2025424B5 EDGAR

The 60 filings since October 2021 can be filtered by form type and year here when JavaScript is on.

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

SEC filer profile

How SOUTHERN POWER CO is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

  • Name on EDGARSOUTHERN POWER CO1
  • CIK0001160661
  • Employer ID (EIN)58-06900704
  • Filer statusLarge accelerated filer not an emerging growth company; not a smaller reporting company; not a shell company4
  • Incorporated inDelaware4
  • Industry code (SIC)4911 Electric Services1
  • SEC reviewing officeOffice of Energy & Transportation, Division of Corporation Finance1
  • Business address30 Ivan Allen Jr. Blvd, Atlanta, GA 303081
  • Phone40450650001
  • Shares outstanding1,119,391,291 shares; 30,537,500 Alabama Power shares; 9,261,500 Georgia Power shares; 1,121,000 Mississippi Power shares; 1,000 Southern Power shares; 100 Southern Company Gas shares as of Jan 31, 20264
  • Public float$101.0B as of Jun 30, 20254
  • AuditorDeloitte & Touche LLP, Atlanta, Georgia PCAOB ID 34; it also attests to the company’s internal control over financial reporting4
  • On EDGAR sinceOct 11, 20011
  • Filings353 in all: 8-K (139), 10-Q (72), 10-K (24), 424B2 (18), UPLOAD (18), FWP (17), 424B5 (16), CORRESP (15)1
    All 21 form types

    EFFECT (7), S-3 (7), U-1/A (3), 25-NSE (2), 424B3 (2), CT ORDER (2), S-3/A (2), S-3ASR (2), S-4 (2), U-1 (2), 8-A12B (1), CERTNYS (1), U-12-IB (1)

  • Latest filingsAnnual report (10-K) Feb 19, 2026
    Quarterly report (10-Q) Jul 30, 2026
    Latest 8-K (8-K) Jul 30, 2026

Securities registered for trading

ClassSymbolExchange
Common Stock, par value $5 per shareSONew York Stock Exchange
Series 2017B 5.25% Junior Subordinated Notes due 2077SOJCNYSE
Series 2020A 4.95% Junior Subordinated Notes due 2080SOJDNYSE
Series 2020C 4.20% Junior Subordinated Notes due 2060SOJENYSE
Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081SO 81NYSE
Series 2025A 6.50% Junior Subordinated Notes due 2085SOJFNYSE
2025 Series A Corporate UnitsSOMNNYSE
Series 2017A 5.00% Junior Subordinated Notes due 2077GPJANYSE
Series 2016B 1.850% Senior Notes due 2026SO/26ANYSE

From the cover page of the 10-K filed Feb 19, 2026 (Section 12(b) of the Exchange Act).4

Risk factors and legal proceedings

The risks SOUTHERN POWER CO names in Item 1A of its 10-K filed Feb 19, 2026: 29 risks under these headings, as written.4

  • UTILITY REGULATORY, LEGISLATIVE, AND LITIGATION RISKS
  • Southern Company and its subsidiaries are subject to substantial federal, state, and local governmental regulation, including with respect to rates. Compliance with current and future legal and regulatory requirements and procurement of necessary approvals, permits, and certificates may result in substantial costs to Southern Company and its subsidiaries. The reduction, elimination, or expiration of government incentives for, or regulations mandating or restricting the use of, renewable energy projects could reduce demand for renewable energy projects and harm the Registrants' businesses.
  • The Southern Company system's costs of compliance with environmental laws and regulations and satisfying related AROs are significant.
  • The Southern Company system may be exposed to regulatory and financial risks related to the impact of GHG legislation, regulation, and emission reduction goals.
  • OPERATIONAL RISKS
  • The financial performance of Southern Company and its subsidiaries may be adversely affected if the subsidiaries are unable to successfully operate their facilities or perform certain corporate functions.
  • Operation of nuclear facilities involves inherent risks, including environmental, safety, health, regulatory, natural disasters, cyber intrusions, physical attacks, and financial risks, that could result in fines or the closure of the nuclear units owned by Alabama Power or Georgia Power and which may present potential exposures in excess of insurance coverage.
  • Generation, transmission, and distribution of electricity and transportation and storage of natural gas involve risks that may result in accidents and other operating risks and costs and that may present potential exposures in excess of insurance coverage.
  • Physical attacks, both threatened and actual, could impact the ability of the Subsidiary Registrants to operate.
  • An information security incident, including a cybersecurity breach, or the failure of, or inability to remotely access, one or more key technology systems, networks, or processes could impact the ability of the Registrants to operate.
  • The Southern Company system may not be able to obtain adequate natural gas, fuel supplies, and other resources required to operate the traditional electric operating companies' and Southern Power's electric generating plants or serve Southern Company Gas' natural gas customers.
  • The revenues of Southern Company, the traditional electric operating companies, and Southern Power depend in part on sales under PPAs, the success of which depend on PPA counterparties performing their obligations, Southern Company subsidiaries satisfying minimum requirements under the PPAs, and renewal or replacement of the PPAs for the related generating capacity.
The other 19 risks
  • Increased competition from other companies that supply energy or generation and storage technologies and changes in customer demand for energy could negatively impact Southern Company and its subsidiaries.
  • The Subsidiary Registrants are subject to workforce factors that could affect operations.
  • Supply chain disruptions, inflation, elevated interest rates, trade policies (including tariffs and other trade measures), and other economic factors could negatively impact operations.
  • CONSTRUCTION RISKS
  • The Registrants have incurred and may incur additional costs or delays in the construction of new plants or other facilities and may not be able to recover their investments. Also, existing facilities of the Subsidiary Registrants require ongoing expenditures, including those to maintain reliability and meet AROs and other environmental standards and goals.
  • Southern Company Gas' significant investment in pipeline development projects involves financial and execution risks.
  • FINANCIAL, ECONOMIC, AND MARKET RISKS
  • The electric generation and energy marketing operations of the traditional electric operating companies and Southern Power and the natural gas operations of Southern Company Gas are subject to changes in energy prices and fuel costs.
  • The Registrants are subject to risks associated with a changing economic environment, customer behaviors, including increased energy conservation, and adoption patterns of technologies by customers.
  • The operating results of the Registrants are affected by weather conditions and may fluctuate on a seasonal basis. In addition, catastrophic events could result in substantial damage to or limit the operation of the properties of a Subsidiary Registrant.
  • Acquisitions, dispositions, or other strategic ventures or investments may not result in anticipated benefits and may present risks, including risks not originally contemplated.
  • Southern Company and Southern Company Gas are holding companies and Southern Power owns many of its assets indirectly through subsidiaries. Each of these companies is dependent on cash flows from their respective subsidiaries to meet their ongoing and future financial obligations.
  • A downgrade in the credit ratings of any of the Registrants, Southern Company Gas Capital, or Nicor Gas could negatively affect their ability to access capital at reasonable costs and/or could require posting of collateral or replacing certain indebtedness.
  • Uncertainty in demand for energy can result in lower earnings or higher costs.
  • The businesses of the Registrants and Nicor Gas are dependent on their ability to successfully access capital through capital markets and financial institutions.
  • Failure to comply with debt covenants or conditions could adversely affect the ability of the Registrants, SEGCO, Southern Company Gas Capital, or Nicor Gas to execute future borrowings.
  • Volatility in the securities markets, interest rates, and other factors could substantially increase defined benefit pension and other postretirement plan costs and affect the funding available for nuclear decommissioning.
  • Shareholder activism could cause Southern Company to incur significant expense, hinder execution of Southern Company's business strategy, and impact Southern Company's stock price.
  • The Registrants are subject to risks associated with their ability to obtain adequate insurance at acceptable costs.
  • The use of derivative contracts by Southern Company and its subsidiaries in the normal course of business could result in financial losses that negatively impact the net income of the Registrants or in reported net income volatility.
  • Future impairments of goodwill or long-lived assets could have a material adverse effect on the Registrants' results of operations.

Legal proceedings

See Note 3 to the financial statements in Item 8 herein for descriptions of legal and administrative proceedings discussed therein. The Registrants' threshold for disclosing material environmental legal proceedings involving a governmental authority where potential monetary sanctions are involved is $1 million.

The opening of Item 3, Legal Proceedings.4