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Benefit Plans
 6 Months Ended
Jun. 30, 2024
Benefit Plans BENEFIT PLANS
The disclosures in this note apply to all Registrants except AEPTCo.

AEPSC sponsors a qualified pension plan and two unfunded non-qualified pension plans.  Substantially all AEP subsidiary employees are covered by the qualified plan or both the qualified and a non-qualified pension plan.  AEPSC also sponsors OPEB plans to provide health and life insurance benefits for retired employees.

Components of Net Periodic Benefit Cost (Credit)

Pension Plans

Three Months Ended June 30, 2024AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$25.6 $2.2 $2.5 $3.3 $2.3 $1.6 $2.1 
Interest Cost51.9 4.4 6.2 5.9 4.7 2.5 3.1 
Expected Return on Plan Assets(80.2)(6.6)(10.7)(10.6)(8.1)(4.4)(4.4)
Amortization of Net Actuarial Loss1.1 0.1 0.1 0.1 — 0.1 — 
Net Periodic Benefit Cost (Credit) (a)$(1.6)$0.1 $(1.9)$(1.3)$(1.1)$(0.2)$0.8 

Three Months Ended June 30, 2023AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$23.6 $2.1 $2.2 $3.0 $2.1 $1.4 $1.9 
Interest Cost54.8 4.6 6.6 6.2 5.0 2.7 3.5 
Expected Return on Plan Assets(84.8)(7.0)(11.1)(11.1)(8.5)(4.6)(4.9)
Amortization of Net Actuarial Loss0.4 — — — — — — 
Net Periodic Benefit Cost (Credit)$(6.0)$(0.3)$(2.3)$(1.9)$(1.4)$(0.5)$0.5 

Six Months Ended June 30, 2024AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$51.2 $4.4 $4.9 $6.6 $4.7 $3.1 $4.0 
Interest Cost103.8 8.7 12.4 11.9 9.4 5.0 6.2 
Expected Return on Plan Assets(160.4)(13.0)(21.4)(21.4)(16.3)(8.7)(8.8)
Amortization of Net Actuarial Loss2.2 0.2 0.2 0.2 0.1 0.1 0.1 
Net Periodic Benefit Cost (Credit) (a)$(3.2)$0.3 $(3.9)$(2.7)$(2.1)$(0.5)$1.5 

Six Months Ended June 30, 2023AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$47.2 $4.1 $4.5 $6.0 $4.2 $2.8 $3.8 
Interest Cost109.6 9.2 13.2 12.4 9.9 5.4 7.0 
Expected Return on Plan Assets(169.6)(14.0)(22.3)(22.1)(17.0)(9.2)(9.7)
Amortization of Net Actuarial Loss0.7 — — — — — — 
Net Periodic Benefit Cost (Credit)$(12.1)$(0.7)$(4.6)$(3.7)$(2.9)$(1.0)$1.1 

(a)Excludes an immaterial one-time settlement cost to a non-qualified pension plan in the second quarter of 2024 for AEP.
OPEB

Three Months Ended June 30, 2024AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$1.1 $0.1 $0.1 $0.2 $0.1 $— $0.1 
Interest Cost10.6 0.8 1.6 1.2 1.0 0.6 0.6 
Expected Return on Plan Assets(27.9)(2.2)(4.1)(3.3)(2.9)(1.6)(1.8)
Amortization of Prior Service Credit(3.2)(0.2)(0.4)(0.5)(0.3)(0.2)(0.2)
Amortization of Net Actuarial Loss0.7 — 0.1 0.1 0.1 0.1 — 
Net Periodic Benefit Credit (a)$(18.7)$(1.5)$(2.7)$(2.3)$(2.0)$(1.1)$(1.3)

Three Months Ended June 30, 2023AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$1.2 $0.1 $0.2 $0.2 $0.1 $— $0.1 
Interest Cost11.5 0.9 1.9 1.4 1.1 0.6 0.7 
Expected Return on Plan Assets(27.4)(2.2)(4.0)(3.4)(3.0)(1.4)(1.8)
Amortization of Prior Service Credit(15.7)(1.4)(2.3)(2.1)(1.5)(1.0)(1.2)
Amortization of Net Actuarial Loss3.7 0.3 0.5 0.4 0.4 0.2 0.3 
Net Periodic Benefit Credit$(26.7)$(2.3)$(3.7)$(3.5)$(2.9)$(1.6)$(1.9)

Six Months Ended June 30, 2024AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$2.2 $0.2 $0.2 $0.3 $0.2 $0.1 $0.2 
Interest Cost21.1 1.6 3.3 2.4 2.1 1.1 1.3 
Expected Return on Plan Assets(55.7)(4.5)(8.1)(6.7)(5.9)(3.0)(3.7)
Amortization of Prior Service Credit(6.4)(0.5)(0.9)(0.9)(0.6)(0.4)(0.5)
Amortization of Net Actuarial Loss1.5 0.1 0.2 0.2 0.2 0.1 0.1 
Net Periodic Benefit Credit (a)$(37.3)$(3.1)$(5.3)$(4.7)$(4.0)$(2.1)$(2.6)

Six Months Ended June 30, 2023AEPAEP TexasAPCoI&MOPCoPSOSWEPCo
(in millions)
Service Cost$2.3 $0.2 $0.3 $0.4 $0.2 $0.1 $0.2 
Interest Cost23.1 1.8 3.7 2.7 2.3 1.2 1.4 
Expected Return on Plan Assets(54.8)(4.5)(8.0)(6.8)(5.9)(2.9)(3.6)
Amortization of Prior Service Credit(31.5)(2.7)(4.6)(4.3)(3.1)(2.0)(2.4)
Amortization of Net Actuarial Loss7.4 0.6 1.1 0.9 0.8 0.4 0.5 
Net Periodic Benefit Credit$(53.5)$(4.6)$(7.5)$(7.1)$(5.7)$(3.2)$(3.9)

(a)Excludes an immaterial one-time cost related to special termination benefits resulting from the voluntary severance program announced in the second quarter of 2024. See Note 13 - Voluntary Severance Program for additional information.