v3.26.1
Retirement Benefits
 6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Retirement Benefits RETIREMENT BENEFITS
The Southern Company system has a qualified defined benefit, trusteed, pension plan covering substantially all employees, with the exception of employees at PowerSecure. The qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended. No mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2026. The Southern Company system also provides certain non-qualified defined benefits for a select group of management and highly compensated employees, which are funded on a cash basis. In addition, the Southern Company system provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The traditional electric operating companies fund other postretirement trusts to the extent required by their respective regulatory commissions.
See Note 11 to the financial statements in Item 8 of the Form 10-K for additional information.
On each Registrant's condensed statements of income, the service cost component of net periodic benefit costs is included in other operations and maintenance expenses and all other components of net periodic benefit costs are included in other income (expense), net. Components of the net periodic benefit costs for the three and six months ended June 30, 2026 and 2025 are presented in the following tables.
Southern
Company		Alabama
Power		Georgia
Power		Mississippi
Power		Southern
Power		Southern
Company
Gas
(in millions)
Three Months Ended June 30, 2026
Pension Plans
Service cost$69 $16 $16 $3 $1 $7 
Interest cost161 37 47 8 3 11 
Expected return on plan assets(322)(78)(100)(14)(4)(22)
Amortization:
Prior service costs— — 1 — — (1)
Net (gain) loss19 5 7 — (1)1 
Net periodic pension income$(73)$(20)$(29)$(3)$(1)$(4)
Postretirement Benefits
Service cost$3 $1 $1 $— $— $— 
Interest cost16 4 6 — — 2 
Expected return on plan assets(22)(8)(8)1 — (2)
Amortization:
Net gain(2)(1)— — — (2)
Net periodic postretirement benefit cost (income)$(5)$(4)$(1)$1 $— $(2)
Six Months Ended June 30, 2026
Pension Plans
Service cost$138 $31 $33 $6 $3 $14 
Interest cost323 75 94 15 5 22 
Expected return on plan assets(644)(157)(199)(29)(8)(43)
Amortization:
Prior service costs— — 1 — — (1)
Regulatory asset— — — — — 3 
Net (gain) loss37 10 13 1 (1)1 
Net periodic pension income$(146)$(41)$(58)$(7)$(1)$(4)
Postretirement Benefits
Service cost$6 $2 $2 $— $— $— 
Interest cost32 8 12 1 — 3 
Expected return on plan assets(45)(17)(16)— — (4)
Amortization:
Prior service costs1 — — — — — 
Net gain(4)(1)— — — (4)
Net periodic postretirement benefit cost (income)$(10)$(8)$(2)$1 $— $(5)
Southern
Company		Alabama
Power		Georgia
Power		Mississippi
Power		Southern
Power		Southern
Company
Gas
(in millions)
Three Months Ended June 30, 2025
Pension Plans
Service cost$66 $15 $15 $2 $2 $7 
Interest cost166 38 49 8 3 11 
Expected return on plan assets(320)(78)(99)(14)(4)(22)
Amortization:
Prior service costs— — 1 — — (1)
Regulatory asset— — — — — 4 
Net (gain) loss10 4 3 — (2)— 
Net periodic pension income$(78)$(21)$(31)$(4)$(1)$(1)
Postretirement Benefits
Service cost$3 $1 $1 $— $— $— 
Interest cost18 4 7 — — 2 
Expected return on plan assets(22)(9)(8)— — (2)
Amortization:
Regulatory asset— — — — — 2 
Net (gain) loss(4)— (2)1 — (2)
Net periodic postretirement benefit cost (income)$(5)$(4)$(2)$1 $— $— 
Six Months Ended June 30, 2025
Pension Plans
Service cost$132 $30 $31 $5 $3 $13 
Interest cost332 77 98 15 5 22 
Expected return on plan assets(640)(156)(198)(29)(8)(43)
Amortization:
Prior service costs— — 1 — — (1)
Regulatory asset— — — — — 8 
Net (gain) loss19 6 7 1 (1)— 
Net periodic pension income$(157)$(43)$(61)$(8)$(1)$(1)
Postretirement Benefits
Service cost$6 $2 $2 $— $— $— 
Interest cost35 8 13 1 — 4 
Expected return on plan assets(45)(18)(16)— — (4)
Amortization:
Prior service costs1 — — — — — 
Regulatory asset— — — — — 3 
Net gain(7)— (2)— — (4)
Net periodic postretirement benefit cost (income)$(10)$(8)$(3)$1 $— $(1)