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RETIREMENT BENEFITS (Tables)
12 Months Ended
Dec. 31, 2025
Retirement Benefits [Abstract]  
Summary of actuarial assumptions
The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below.
2025
Assumptions used to determine net
periodic costs:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
Pension plans
Discount rate – benefit obligations5.76 %5.78 %5.75 %5.76 %5.84 %5.73 %
Discount rate – interest costs5.47 5.48 5.44 5.46 5.58 5.46 
Discount rate – service costs5.93 5.95 5.95 5.94 5.93 5.84 
Expected long-term return on plan assets8.50 8.50 8.50 8.50 8.50 8.50 
Annual salary increase4.60 4.60 4.60 4.60 4.60 4.60 
Other postretirement benefit plans
Discount rate – benefit obligations5.64 %5.67 %5.61 %5.63 %5.73 %5.62 %
Discount rate – interest costs5.35 5.38 5.34 5.34 5.45 5.30 
Discount rate – service costs5.90 5.92 5.91 5.89 5.86 5.89 
Expected long-term return on plan assets7.80 8.06 7.78 7.69 6.44 
Annual salary increase4.60 4.60 4.60 4.60 4.60 4.60 
2024
Assumptions used to determine net
periodic costs:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
Pension plans
Discount rate – benefit obligations5.07 %5.08 %5.06 %5.06 %5.14 %5.05 %
Discount rate – interest costs4.94 4.94 4.94 4.93 5.01 4.93 
Discount rate – service costs5.19 5.20 5.21 5.19 5.20 5.13 
Expected long-term return on plan assets8.30 8.30 8.30 8.30 8.30 8.30 
Annual salary increase4.60 4.60 4.60 4.60 4.60 4.60 
Other postretirement benefit plans
Discount rate – benefit obligations4.99 %5.01 %4.98 %4.98 %5.06 %4.98 %
Discount rate – interest costs4.90 4.90 4.89 4.90 4.94 4.89 
Discount rate – service costs5.16 5.17 5.16 5.16 5.14 5.16 
Expected long-term return on plan assets7.67 7.97 7.59 7.43 6.36 
Annual salary increase4.60 4.60 4.60 4.60 4.60 4.60 
2023
Assumptions used to determine net periodic costs:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
Pension plans
Discount rate – benefit obligations5.25 %5.26 %5.25 %5.25 %5.31 %5.24 %
Discount rate – interest costs5.13 5.14 5.12 5.12 5.19 5.12 
Discount rate – service costs5.36 5.38 5.38 5.37 5.37 5.31 
Expected long-term return on plan assets8.40 8.40 8.40 8.40 8.40 8.40 
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
Other postretirement benefit plans
Discount rate – benefit obligations5.18 %5.20 %5.17 %5.17 %5.24 %5.16 %
Discount rate – interest costs5.08 5.09 5.07 5.08 5.12 5.07 
Discount rate – service costs5.34 5.35 5.34 5.33 5.33 5.33 
Expected long-term return on plan assets7.67 7.95 7.49 7.43 6.59 
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
2025
Assumptions used to determine benefit obligations:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
Pension plans
Discount rate5.69 %5.72 %5.67 %5.66 %5.85 %5.61 %
Annual salary increase5.00 5.00 5.00 5.00 5.00 5.00 
Other postretirement benefit plans
Discount rate5.40 %5.45 %5.34 %5.38 %5.59 %5.38 %
Annual salary increase5.00 5.00 5.00 5.00 5.00 5.00 
2024
Assumptions used to determine benefit obligations:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
Pension plans
Discount rate5.76 %5.78 %5.75 %5.76 %5.84 %5.73 %
Annual salary increase4.60 4.60 4.60 4.60 4.60 4.60 
Other postretirement benefit plans
Discount rate5.64 %5.67 %5.61 %5.63 %5.73 %5.62 %
Annual salary increase4.60 4.60 4.60 4.60 4.60 4.60 
Schedule of health care cost trend rates The weighted average medical care cost trend rates used in measuring the APBO for the Registrants at December 31, 2025 were as follows:
Initial Cost
Trend Rate
Ultimate Cost
Trend Rate
Year That
Ultimate Rate is
Reached
Pre-658.50 %4.50 %2034
Post-65 medical6.00 4.50 2034
Post-65 prescription11.00 4.50 2034
Schedule of accumulated and projected benefit obligations
The total accumulated benefit obligation for the pension plans at December 31, 2025 and 2024 was as follows:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
At December 31, 2025$11,952 $2,730 $3,549 $542 $147 $829 
At December 31, 202411,437 2,617 3,438 519 140 779 
The projected benefit obligations for the qualified and non-qualified pension plans at December 31, 2025 are shown in the following table. All pension plan assets are related to the qualified pension plan.
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
Projected benefit obligations:
Qualified pension plan$12,493 $2,939 $3,762 $566 $154 $837 
Non-qualified pension plan696 116 111 28 21 59 
Amounts recognized in balance sheets
Amounts recognized in the balance sheets at December 31, 2025 and 2024 related to the Registrants' pension plans consist of the following:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
At December 31, 2025:
Prepaid pension costs(a)
$3,257 $899 $1,099 $151 $51 $219 
Other regulatory assets, deferred(b)
2,533 687 907 136  114 
Other current liabilities(68)(12)(13)(3)(2)(3)
Employee benefit obligations(c)
(628)(104)(98)(25)(19)(56)
Other regulatory liabilities, deferred(47)     
AOCI38    4 (56)
At December 31, 2024:
Prepaid pension costs(a)
$2,674 $746 $897 $124 $41 $191 
Other regulatory assets, deferred(b)
2,708 741 973 144 — 126 
Other current liabilities(68)(13)(13)(2)(2)(4)
Employee benefit obligations(c)
(611)(102)(98)(25)(18)(51)
Other regulatory liabilities, deferred(50)  — — — 
AOCI52   — 11 (54)
(a)Included in prepaid pension and other postretirement benefit costs on Alabama Power's and Southern Company Gas' balance sheets and other deferred charges and assets on Southern Power's consolidated balance sheets.
(b)Amounts for Southern Company exclude regulatory assets of $135 million and $155 million at December 31, 2025 and 2024, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.
(c)Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.
Presented below are the amounts included in regulatory assets at December 31, 2025 and 2024 related to the portion of the defined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic pension cost.
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Company
Gas
(in millions)
Balance at December 31, 2025
Regulatory assets:
Prior service cost$8 $3 $4 $1 $(2)
Net loss2,478 684 903 135 89 
Regulatory amortization    27 
Total regulatory assets(*)
$2,486 $687 $907 $136 $114 
Balance at December 31, 2024
Regulatory assets:
Prior service cost$$$$$(4)
Net loss2,650 738 968 143 91 
Regulatory amortization— — — — 39 
Total regulatory assets(*)
$2,658 $741 $973 $144 $126 
(*)Amounts for Southern Company exclude regulatory assets of $135 million and $155 million at December 31, 2025 and 2024, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.
Amounts recognized in the balance sheets at December 31, 2025 and 2024 related to the Registrants' other postretirement benefit plans consist of the following:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
At December 31, 2025:
Prepaid other postretirement benefit costs(a)
$ $117 $ $ $ $10 
Other regulatory assets, deferred(b)
25      
Other current liabilities(6)   (1) 
Employee benefit obligations(c)
(143) (53)(30)(8) 
Other regulatory liabilities, deferred(199)(47)(56)(6) (93)
AOCI(13)   1 (16)
At December 31, 2024:
Prepaid other postretirement benefit costs(a)
$— $95 $— $— $— $— 
Other regulatory assets, deferred(b)
24 — — — — 
Other current liabilities(6)— — — (1)— 
Employee benefit obligations(c)
(212)— (68)(31)(8)(15)
Other regulatory liabilities, deferred(213)(45)(67)(9)— (84)
AOCI(14)— — — — (15)
(a)Included in prepaid pension and other postretirement benefit costs on Alabama Power's and Southern Company Gas' balance sheets.
(b)Amounts for Southern Company exclude regulatory assets of $4 million and $16 million at December 31, 2025 and 2024, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
(c)Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.
Presented below are the amounts included in net regulatory assets (liabilities) at December 31, 2025 and 2024 related to the other postretirement benefit plans of Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost.
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Company
Gas
(in millions)
Balance at December 31, 2025:
Regulatory assets (liabilities):
Prior service cost$8 $3 $3 $1 $ 
Net gain(182)(50)(59)(7)(75)
Regulatory amortization    (18)
Total regulatory assets (liabilities)(*)
$(174)$(47)$(56)$(6)$(93)
Balance at December 31, 2024:
Regulatory assets (liabilities):
Prior service cost$11 $$$$— 
Net gain(200)(48)(68)(10)(71)
Regulatory amortization— — — — (13)
Total regulatory assets (liabilities)(*)
$(189)$(45)$(64)$(9)$(84)
(*)Amounts for Southern Company exclude regulatory assets of $4 million and $16 million at December 31, 2025 and 2024, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
Changes in projected benefit obligations and fair value of plan assets
Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2025 and 2024 were as follows:
2025
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
Change in benefit obligation
Benefit obligation at beginning of year$12,564 $2,908 $3,733 $567 $167 $842 
Service cost264 60 63 11 6 27 
Interest cost664 154 196 30 9 45 
Benefits paid(761)(166)(247)(35)(6)(55)
Actuarial (gain) loss458 99 128 21 (1)36 
Balance at end of year13,189 3,055 3,873 594 175 895 
Change in plan assets
Fair value of plan assets at beginning of year14,559 3,539 4,519 664 188 978 
Actual return on plan assets1,886 452 576 86 22 130 
Employer contributions66 13 13 2 1 2 
Benefits paid(761)(166)(247)(35)(6)(55)
Fair value of plan assets at end of year15,750 3,838 4,861 717 205 1,055 
Accrued asset$2,561 $783 $988 $123 $30 $160 
2024
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
Change in benefit obligation
Benefit obligation at beginning of year$13,252 $3,076 $4,009 $599 $177 $882 
Service cost292 68 70 12 28 
Interest cost635 148 191 29 42 
Benefits paid(728)(162)(239)(33)(6)(46)
Actuarial gain(887)(222)(298)(40)(20)(64)
Balance at end of year12,564 2,908 3,733 567 167 842 
Change in plan assets
Fair value of plan assets at beginning of year14,618 3,544 4,571 669 185 980 
Actual return on plan assets604 148 152 23 39 
Employer contributions65 35 
Benefits paid(728)(162)(239)(33)(6)(46)
Fair value of plan assets at end of year14,559 3,539 4,519 664 188 978 
Accrued asset$1,995 $631 $786 $97 $21 $136 
Components of net periodic benefit cost
Components of net periodic pension cost for the Registrants were as follows:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
2025
Service cost$264 $60 $63 $11 $6 $27 
Interest cost664 154 196 30 9 45 
Expected return on plan assets(1,281)(312)(397)(59)(17)(86)
Recognized net (gain) loss(*)
38 11 15 3  (1)
Net amortization(*)
 1 1   15 
Prior service cost(*)
— — — — — (3)
Net periodic pension income$(315)$(86)$(122)$(15)$(2)$(3)
2024
Service cost$292 $68 $70 $12 $$28 
Interest cost635 148 191 29 42 
Expected return on plan assets(1,263)(307)(393)(58)(17)(85)
Recognized net loss(*)
55 16 19 — — 
Net amortization(*)
— — — 15 
Prior service cost(*)
— — — — — (3)
Net periodic pension income$(281)$(74)$(112)$(14)$(1)$(3)
2023
Service cost$275 $64 $68 $11 $$24 
Interest cost626 145 191 28 42 
Expected return on plan assets(1,229)(297)(385)(56)(15)(85)
Recognized net (gain) loss(*)
32 13 — (5)
Net amortization(*)
— — — 15 
Prior service cost(*)
— — — — — (3)
Net periodic pension income$(296)$(78)$(112)$(15)$(1)$(12)
(*)For Southern Company, excludes amounts related to net periodic pension cost of $20 million, $20 million, and $17 million for the years ended December 31, 2025, 2024, and 2023, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.
Components of the other postretirement benefit plans' net periodic cost for the Registrants were as follows:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
2025
Service cost$13 $4 $4 $1 $ $ 
Interest cost70 17 25 3  7 
Expected return on plan assets(91)(35)(33)(3)1 (15)
Net amortization(*)
(12)(2)(2)  5 
Net periodic other postretirement benefit cost (income)$(20)$(16)$(6)$1 $1 $(3)
2024
Service cost$15 $$$$— $
Interest cost65 16 23 — 
Expected return on plan assets(89)(35)(32)(3)(13)
Net amortization(*)
(13)(3)(4)— — 
Net periodic other postretirement benefit cost (income)$(22)$(18)$(9)$$$
2023
Service cost$15 $$$$— $
Interest cost70 17 25 — 
Expected return on plan assets(83)(33)(29)(3)(10)
Net amortization(*)
(11)(3)(3)— — 
Net periodic other postretirement benefit cost (income)$(9)$(15)$(3)$$$
(*)For Southern Company, excludes amounts related to net periodic other postretirement benefit cost of $12 million, $8 million, and $8 million for the years ended December 31, 2025, 2024, and 2023, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
Estimated pension benefit payments At December 31, 2025, estimated benefit payments were as follows:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
Benefit Payments:
2026$803 $176 $252 $36 $$62 
2027827 182 255 37 63 
2028847 188 259 38 65 
2029868 193 264 38 66 
2030889 198 267 39 68 
2031 to 20354,638 1,041 1,353 209 55 360 
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
Benefit payments:
2026$114 $26 $42 $$$15 
2027115 26 43 15 
2028116 27 43 14 
2029116 27 43 14 
2030116 27 43 13 
2031 to 2035566 136 211 23 56 
Components of OCI related to defined benefit pension plan
The components of OCI related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas for the years ended December 31, 2025 and 2024 are presented in the following table:
Southern
Company
Southern
Power
Southern
Company
Gas
(in millions)
AOCI:
Balance at December 31, 2023$79 $20 $(45)
Net gain(29)(9)(11)
Reclassification adjustments:
Amortization of prior service costs— 
Amortization of net gain— — 
Total reclassification adjustments— 
Total change(27)(9)(9)
Balance at December 31, 2024$52 $11 $(54)
Net gain(21)(7)(3)
Reclassification adjustments:
Amortization of prior service costs1  1 
Amortization of net gain6   
Total reclassification adjustments7  1 
Total change(14)(7)(2)
Balance at December 31, 2025$38 $4 $(56)
The components of OCI related to the other postretirement benefit plans for the plan years ended December 31, 2025 and 2024 are presented in the following table:
Southern
Company
Southern
Power
Southern
Company Gas
(in millions)
AOCI:
Balance at December 31, 2023$(9)$$(10)
Net gain(8)(1)(5)
Reclassification adjustments:
Amortization of net gain— — 
Total change(5)(1)(5)
Balance at December 31, 2024$(14)$— $(15)
Net (gain) loss(1)1 (1)
Reclassification adjustments:
Amortization of net gain2   
Total change1 1 (1)
Balance at December 31, 2025$(13)$1 $(16)
Changes in the APBO and the fair value of plan assets
Changes in the APBO and the fair value of the Registrants' plan assets during the plan years ended December 31, 2025 and 2024 were as follows:
2025
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
Change in benefit obligation
Benefit obligation at beginning of year$1,359 $326 $488 $55 $9 $156 
Service cost13 4 4 1   
Interest cost70 17 25 3  7 
Benefits paid(113)(24)(40)(5)(1)(16)
Actuarial (gain) loss71 17 34 3 1 (1)
Balance at end of year1,400 340 511 57 9 146 
Change in plan assets
Fair value of plan assets at beginning of year1,141 421 420 24  141 
Actual return on plan assets158 56 61 4  19 
Employer contributions65 4 17 4 1 12 
Benefits paid(113)(24)(40)(5)(1)(16)
Fair value of plan assets at end of year1,251 457 458 27  156 
Accrued asset (liability)$(149)$117 $(53)$(30)$(9)$10 
2024
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
Change in benefit obligation
Benefit obligation at beginning of year$1,386 $329 $489 $57 $$172 
Service cost15 — 
Interest cost65 16 23 — 
Benefits paid(105)(25)(37)(4)(1)(12)
Actuarial (gain) loss(2)(2)(13)
Balance at end of year1,359 326 488 55 156 
Change in plan assets
Fair value of plan assets at beginning of year1,095 403 410 25 — 128 
Actual return on plan assets96 37 34 — — 18 
Employer contributions55 13 
Benefits paid(105)(25)(37)(4)(1)(12)
Fair value of plan assets at end of year1,141 421 420 24 — 141 
Accrued asset (liability)$(218)$95 $(68)$(31)$(9)$(15)
Changes in balances of regulatory assets and regulatory liabilities related to defined benefit pension plans
The changes in the balance of net regulatory assets (liabilities) related to the portion of the defined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas for the years ended December 31, 2025 and 2024 are presented in the following table:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Company
Gas
(in millions)
Net regulatory assets (liabilities):(*)
Balance at December 31, 2023$2,913 $821 $1,051 $152 $143 
Net gain(199)(63)(58)(5)(7)
Reclassification adjustments:
Amortization of prior service costs(1)(1)(1)— 
Amortization of net loss(55)(16)(19)(3)(1)
Amortization of regulatory assets(*)
— — — — (11)
Total reclassification adjustments(56)(17)(20)(3)(10)
Total change(255)(80)(78)(8)(17)
Balance at December 31, 2024$2,658 $741 $973 $144 $126 
Net (gain) loss(127)(42)(50)(5)1 
Reclassification adjustments:
Amortization of prior service costs(1)(1)(1) 2 
Amortization of net loss(44)(11)(15)(3)(3)
Amortization of regulatory assets(*)
    (12)
Total reclassification adjustments(45)(12)(16)(3)(13)
Total change(172)(54)(66)(8)(12)
Balance at December 31, 2025$2,486 $687 $907 $136 $114 
(*)Amounts for Southern Company exclude regulatory assets of $135 million and $155 million at December 31, 2025 and 2024, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.
The changes in the balance of net regulatory assets (liabilities) related to the other postretirement benefit plans for the plan years ended December 31, 2025 and 2024 are presented in the following table:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Company
Gas
(in millions)
Net regulatory assets (liabilities):(*)
Balance at December 31, 2023$(208)$(48)$(74)$(10)$(68)
Net (gain) loss(12)
Reclassification adjustments:
Amortization of prior service costs(2)(1)(1)— — 
Amortization of net gain13 — 
Amortization of regulatory assets(*)
— — — — (9)
Total reclassification adjustments11 — (4)
Total change19 10 (16)
Balance at December 31, 2024$(189)$(45)$(64)$(9)$(84)
Net (gain) loss5 (3)6 3 2 
Reclassification adjustments:
Amortization of prior service costs(2)(1)(1)  
Amortization of net gain (loss)12 2 3  (6)
Amortization of regulatory assets(*)
    (5)
Total reclassification adjustments10 1 2  (11)
Total change15 (2)8 3 (9)
Balance at December 31, 2025$(174)$(47)$(56)$(6)$(93)
(*)Amounts for Southern Company exclude regulatory assets of $4 million and $16 million at December 31, 2025 and 2024, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
Amounts included in AOCI related to defined benefit pension plans
Presented below are the amounts included in AOCI at December 31, 2025 and 2024 related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic pension cost.
Southern
Company
Southern
Power
Southern
Company
Gas
(in millions)
Balance at December 31, 2025
AOCI:
Net (gain) loss$38 $4 $(56)
Balance at December 31, 2024
AOCI:
Prior service cost$(1)$— $(1)
Net (gain) loss53 11 (53)
Total AOCI$52 $11 $(54)
Presented below are the amounts included in AOCI at December 31, 2025 and 2024 related to the other postretirement benefit plans of Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost.
Southern
Company
Southern
Power
Southern
Company
Gas
(in millions)
Balance at December 31, 2025
AOCI:
Net (gain) loss$(13)$1 $(16)
Balance at December 31, 2024
AOCI:
Net gain$(14)$— $(15)
Summary of investment strategies and benefit plan asset fair values
A description of the major asset classes that the pension and other postretirement benefit plans are comprised of, along with the valuation methods used for fair value measurement, is provided below:
DescriptionValuation Methodology
Domestic equity: A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches.

International equity: A mix of large and small capitalization growth and value stocks with developed and emerging markets exposure, managed both actively and through fundamental indexing approaches.
Domestic and international equities such as common stocks, American depositary receipts, and real estate investment trusts that trade on public exchanges are classified as Level 1 investments and are valued at the closing price in the active market. Equity funds with unpublished prices that are comprised of publicly traded securities (such as commingled/pooled funds) are also valued at the closing price in the active market but are classified as Level 2.
Fixed income: A mix of domestic and international bonds.
Investments in fixed income securities, including fixed income pooled funds, are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
Trust-owned life insurance (TOLI): Investments of taxable trusts aimed at minimizing the impact of taxes on the portfolio.
Investments in TOLI policies are classified as Level 2 investments and are valued based on the underlying investments held in the policy's separate accounts. The underlying assets are equity and fixed income pooled funds that are comprised of Level 1 and Level 2 securities.
Real estate: Investments in equity or debt of real properties and in publicly traded real estate securities.

Special situations: Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies, as well as investments in promising new strategies of a longer-term nature.

Private equity: Investments in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.

Private credit: Investments focused on debt instruments, of which returns are driven by income rather than capital appreciation.

Infrastructure: Investments in real assets, typically with long-term, predictable, and stable cash flows and a meaningful income component.
Investments in real estate, special situations, private equity, private credit, and infrastructure are typically invested in private partnerships and/or other pooled vehicles (Investment Funds) which are generally classified as Net Asset Value as a Practical Expedient, since the Investment Funds and underlying assets are not publicly traded and/or often have liquidity restrictions. The managers of the Investment Funds value the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The total market value of each of the Investment Funds is determined by aggregating the value of the underlying assets less liabilities.
Fair values of plan assets
The fair values, and actual allocations relative to the target allocations, of the Southern Company system's pension plans at December 31, 2025 and 2024 are presented below.
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2025:(Level 1)(Level 2)(NAV)Total
(in millions)
Southern Company
Assets:
Equity:41 %42 %
Domestic equity$2,216 $884 $ $3,100 
International equity2,219 1,184  3,403 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds 1,994  1,994 
Mortgage- and asset-backed securities 75  75 
Corporate bonds 1,859  1,859 
Pooled funds 850  850 
Cash equivalents and other237 5  242 
Real estate investments350  1,541 1,891 12 12 
Special situations  258 258 3 2 
Private equity  1,829 1,829 9 11 
Private credit
  265 265 3 2 
Infrastructure
  60 60 2  
Total$5,022 $6,851 $3,953 $15,826 100 %100 %
Liabilities:
Derivatives$(1)$ $ $(1)
Total$5,021 $6,851 $3,953 $15,825 100 %100 %
Alabama Power
Assets:
Equity:41 %42 %
Domestic equity$538 $215 $ $753 
International equity541 289  830 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds 486  486 
Mortgage- and asset-backed securities 18  18 
Corporate bonds 453  453 
Pooled funds 207  207 
Cash equivalents and other58 1  59 
Real estate investments85  376 461 12 12 
Special situations  63 63 3 2 
Private equity  446 446 9 11 
Private credit
  65 65 3 2 
Infrastructure
  15 15 2  
Total$1,222 $1,669 $965 $3,856 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2025:(Level 1)(Level 2)(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Georgia Power
Assets:
Equity:41 %42 %
Domestic equity$683 $273 $ $956 
International equity685 365  1,050 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds 615  615 
Mortgage- and asset-backed securities 23  23 
Corporate bonds 574  574 
Pooled funds 262  262 
Cash equivalents and other73 2  75 
Real estate investments108  476 584 12 12 
Special situations  80 80 3 2 
Private equity  564 564 9 11 
Private credit
  82 82 3 2 
Infrastructure
  19 19 2  
Total$1,549 $2,114 $1,221 $4,884 100 %100 %
Mississippi Power
Assets:
Equity:41 %42 %
Domestic equity$100 $40 $ $140 
International equity101 54  155 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds 91  91 
Mortgage- and asset-backed securities 3  3 
Corporate bonds 85  85 
Pooled funds 39  39 
Cash equivalents and other11   11 
Real estate investments16  70 86 12 12 
Special situations  12 12 3 2 
Private equity  83 83 9 11 
Private credit
  12 12 3 2 
Infrastructure
  3 3 2  
Total$228 $312 $180 $720 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2025:(Level 1)(Level 2)(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Southern Power
Assets:
Equity:41 %42 %
Domestic equity$29 $12 $ $41 
International equity29 15  44 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds 26  26 
Mortgage- and asset-backed securities 1  1 
Corporate bonds 24  24 
Pooled funds 11  11 
Cash equivalents and other3   3 
Real estate investments5  20 25 12 12 
Special situations  3 3 3 2 
Private equity  24 24 9 11 
Private credit
  3 3 3 2 
Infrastructure
  1 1 2  
Total$66 $89 $51 $206 100%100 %
Southern Company Gas
Assets:
Equity:41 %42 %
Domestic equity$148 $59 $ $207 
International equity149 79  228 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds 134  134 
Mortgage- and asset-backed securities 5  5 
Corporate bonds 125  125 
Pooled funds 57  57 
Cash equivalents and other16   16 
Real estate investments23  103 126 12 12 
Special situations  17 17 3 2 
Private equity  123 123 9 11 
Private credit
  18 18 3 2 
Infrastructure
  4 4 2  
Total$336 $459 $265 $1,060 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2024:(Level 1)(Level 2)(NAV)Total
(in millions)
Southern Company
Assets:
Equity:41 %41 %
Domestic equity$2,095 $835 $— $2,930 
International equity1,959 1,032 — 2,991 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds— 1,780 — 1,780 
Mortgage- and asset-backed securities— 48 — 48 
Corporate bonds— 1,715 — 1,715 
Pooled funds— 792 — 792 
Cash equivalents and other255 — — 255 
Real estate investments361 — 1,563 1,924 12 13 
Special situations— — 237 237 
Private equity— — 1,797 1,797 12 
Private Credit— — 152 152 
Infrastructure— — — — — 
Total$4,670 $6,202 $3,749 $14,621 100 %100 %
Liabilities:
Derivatives$— $(33)$— $(33)
Total$4,670 $6,169 $3,749 $14,588 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2024:(Level 1)(Level 2)(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Alabama Power
Assets:
Equity:41 %41 %
Domestic equity$509 $203 $— $712 
International equity476 251 — 727 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds— 433 — 433 
Mortgage- and asset-backed securities— 12 — 12 
Corporate bonds— 417 — 417 
Pooled funds— 193 — 193 
Cash equivalents and other62 — — 62 
Real estate investments88 — 380 468 12 13 
Special situations— — 57 57 
Private equity— — 437 437 12 
Private credit
— — 37 37 
Infrastructure
— — — — — 
Total$1,135 $1,509 $911 $3,555 100 %100 %
Liabilities:
Derivatives$— $(8)$— $(8)
Total$1,135 $1,501 $911 $3,547 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2024:(Level 1)(Level 2)(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Georgia Power
Assets:
Equity:41 %41 %
Domestic equity$652 $259 $— $911 
International equity608 320 — 928 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds— 552 — 552 
Mortgage- and asset-backed securities— 15 — 15 
Corporate bonds— 532 — 532 
Pooled funds— 246 — 246 
Cash equivalents and other79 — — 79 
Real estate investments112 — 485 597 12 13 
Special situations— — 73 73 
Private equity— — 558 558 12 
Private credit
— — 47 47 
Infrastructure
— — — — — 
Total$1,451 $1,924 $1,163 $4,538 100 %100 %
Liabilities:
Derivatives$— $(10)$— $(10)
Total$1,451 $1,914 $1,163 $4,528 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2024:(Level 1)(Level 2)(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Mississippi Power
Assets:
Equity:41 %41 %
Domestic equity$97 $38 $— $135 
International equity89 47 — 136 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds— 81 — 81 
Mortgage- and asset-backed securities— — 
Corporate bonds— 78 — 78 
Pooled funds— 36 — 36 
Cash equivalents and other12 — — 12 
Real estate investments16 — 71 87 12 13 
Special situations— — 11 11 
Private equity— — 82 82 12 
Private credit
— — 
Infrastructure
— — — — — 
Total$214 $282 $171 $667 100 %100 %
Liabilities:
Derivatives$— $(2)$— $(2)
Total$214 $280 $171 $665 100 %100 %
Southern Power
Assets:
Equity:41 %41 %
Domestic equity$27 $11 $— $38 
International equity25 13 — 38 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds— 23 — 23 
Mortgage- and asset-backed securities
— — 
Corporate bonds— 22 — 22 
Pooled funds— 10 — 10 
Cash equivalents and other— — 
Real estate investments— 20 25 12 13 
Special situations— — 
Private equity— — 23 23 12 
Private credit
— — 
Infrastructure
— — — — — 
Total$60 $80 $48 $188 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2024:(Level 1)(Level 2)(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Southern Company Gas
Assets:
Equity:41 %41 %
Domestic equity$142 $56 $— $198 
International equity132 69 — 201 
Fixed income:30 31 
U.S. Treasury, government, and agency bonds— 120 — 120 
Mortgage- and asset-backed securities— — 
Corporate bonds— 115 — 115 
Pooled funds— 53 — 53 
Cash equivalents and other17 — — 17 
Real estate investments24 — 105 129 12 13 
Special situations— — 16 16 
Private equity— — 121 121 12 
Private credit
— — 10 10 
Infrastructure
— — — — — 
Total$315 $416 $252 $983 100 %100 %
Liabilities:
Derivatives$— $(2)$— $(2)
Total$315 $414 $252 $981 100 %100 %
The fair values, and actual allocations relative to the target allocations, of the applicable Registrants' other postretirement benefit plan assets at December 31, 2025 and 2024 are presented below.
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Total
Target
Allocation
Actual
Allocation
At December 31, 2025:
(Level 1)
(Level 2)
(NAV)
(in millions)
Southern Company
Assets:
Equity:60 %63 %
Domestic equity$98 $108 $ $206 
International equity63 102  165 
Fixed income:30 27 
U.S. Treasury, government, and agency bonds 61  61 
Mortgage- and asset-backed securities 2  2 
Corporate bonds 53  53 
Pooled funds 106  106 
Cash equivalents and other13   13 
Trust-owned life insurance 520  520 
Real estate investments11  44 55 4 4 
Special situations  7 7 1 1 
Private equity  52 52 3 4 
Private credit
  7 7 1 1 
Infrastructure
  2 2 1  
Total$185 $952 $112 $1,249 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Total
Target
Allocation
Actual
Allocation
At December 31, 2025:
(Level 1)
(Level 2)
(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Alabama Power
Assets:
Equity:68 %69 %
Domestic equity$18 $7 $ $25 
International equity18 10  28 
Fixed income:23 23 
U.S. Treasury, government, and agency bonds 17  17 
Mortgage- and asset-backed securities 1  1 
Corporate bonds 15  15 
Pooled funds 11  11 
Cash equivalents and other2   2 
Trust-owned life insurance 320  320 
Real estate investments3  13 16 3 3 
Special situations  2 2 1 1 
Private equity  15 15 3 3 
Private credit  2 2 1 1 
Infrastructure    1  
Total$41 $381 $32 $454 100 %100 %
Georgia Power
Assets:
Equity:59 %60 %
Domestic equity$54 $7 $ $61 
International equity18 50  68 
Fixed income:35 32 
U.S. Treasury, government, and agency bonds 17  17 
Mortgage- and asset-backed securities 1  1 
Corporate bonds 15  15 
Pooled funds 51  51 
Cash equivalents and other8   8 
Trust-owned life insurance 201  201 
Real estate investments4  13 17 3 3 
Special situations  2 2 1 1 
Private equity  15 15 2 3 
Private credit
  2 2  1 
Total$84 $342 $32 $458 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Total
Target
Allocation
Actual
Allocation
At December 31, 2025:
(Level 1)
(Level 2)
(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Mississippi Power
Assets:
Equity:34 %34 %
Domestic equity$3 $1 $ $4 
International equity3 2  5 
Fixed income:43 43 
U.S. Treasury, government, and agency bonds 7  7 
Corporate bonds 3  3 
Pooled funds 1  1 
Cash equivalents and other1   1 
Real estate investments  2 2 10 10 
Special situations    2 2 
Private equity  3 3 7 9 
Private credit
    3 2 
Infrastructure
    1  
Total$7 $14 $5 $26 100 %100 %
Southern Company Gas
Assets:
Equity:72 %74 %
Domestic equity$1 $83 $ $84 
International equity1 29  30 
Fixed income:26 24 
U.S. Treasury, government, and agency bonds 1  1 
Corporate bonds 1  1 
Pooled funds 34  34 
Cash equivalents and other1   1 
Real estate investments  1 1 1 1 
Private equity  1 1 1 1 
Total$3 $148 $2 $153 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2024:(Level 1)(Level 2)(NAV)Total
(in millions)
Southern Company
Assets:
Equity:61 %62 %
Domestic equity$94 $98 $— $192 
International equity54 83 — 137 
Fixed income:29 28 
U.S. Treasury, government, and agency bonds— 54 — 54 
Mortgage- and asset-backed securities— — 
Corporate bonds— 48 — 48 
Pooled funds— 99 — 99 
Cash equivalents and other16 — — 16 
Trust-owned life insurance— 478 — 478 
Real estate investments11 — 43 54 
Special situations— — 
Private equity— — 50 50 
Private credit
— — — 
Infrastructure
— — — — — 
Total$175 $861 $103 $1,139 100 %100 %
Liabilities:
Derivatives$— $(1)$— $(1)
Total$175 $860 $103 $1,138 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2024:(Level 1)(Level 2)(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Alabama Power
Assets:
Equity:68 %68 %
Domestic equity$17 $$— $24 
International equity16 — 25 
Fixed income:23 24 
U.S. Treasury, government, and agency bonds— 14 — 14 
Corporate bonds— 14 — 14 
Pooled funds— 11 — 11 
Cash equivalents and other— — 
Trust-owned life insurance— 294 — 294 
Real estate investments— 13 16 
Special situations— — 
Private equity— — 15 15 
Private credit
— — — 
Infrastructure
— — — — — 
Total$38 $349 $31 $418 100 %100 %
Georgia Power
Assets:
Equity:59 %59 %
Domestic equity$52 $$— $59 
International equity16 41 — 57 
Fixed income:35 33 
U.S. Treasury, government, and agency bonds— 14 — 14 
Corporate bonds— 14 — 14 
Pooled funds— 48 — 48 
Cash equivalents and other10 — — 10 
Trust-owned life insurance— 184 — 184 
Real estate investments— 13 17 
Special situations— — 
Private equity— — 15 15 
Total$82 $308 $30 $420 100 %100 %
Fair Value Measurements Using
Quoted Prices
in Active
Markets for
Identical
Assets
Significant
Other
Observable
Inputs
Net Asset
Value as a
Practical
Expedient
Target
Allocation
Actual
Allocation
At December 31, 2024:(Level 1)(Level 2)(NAV)Total
Target
Allocation
Actual
Allocation
(in millions)
Mississippi Power
Assets:
Equity:34 %32 %
Domestic equity$$$— $
International equity— 
Fixed income:43 44 
U.S. Treasury, government, and agency bonds— — 
Corporate bonds— — 
Pooled funds— — 
Cash equivalents and other— — 
Real estate investments— — 10 11 
Special situations— — — — 
Private equity— — 10 
Private credit
— — — — 
Infrastructure
— — — — — 
Total$$12 $$23 100 %100 %
Southern Company Gas
Assets:
Equity:72 %73 %
Domestic equity$$76 $— $77 
International equity23 — 24 
Fixed income:26 25 
U.S. Treasury, government, and agency bonds— — 
Corporate bonds— — 
Pooled funds— 32 — 32 
Cash equivalents and other— — 
Real estate investments— — 
Private equity— — 
Total$$133 $$138 100 %100 %
Total matching contributions Total matching contributions made to the plans for 2025, 2024, and 2023 were as follows:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern
Company
Gas
(in millions)
2025$148 $30 $36 $5 $3 $21 
2024137 29 31 20 
2023131 28 31 18