
Three Months Ended June 30, 2025	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	23.9	$	2.2	$	2.2	$	3.1	$	2.3	$	1.6	$	1.9
Interest Cost	52.8		4.3		6.3		6.2		4.8		2.5		3.0
Expected Return on Plan Assets	(70.2)		(5.5)		(9.4)		(9.7)		(7.4)		(3.8)		(3.6)

Amortization of Net Actuarial Loss	4.0		0.4		0.5		0.5		0.4		0.1		0.3
Net Periodic Benefit Cost (Credit)	$	10.5	$	1.4	$	(0.4)	$	0.1	$	0.1	$	0.4	$	1.6


Three Months Ended June 30, 2024	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	25.6	$	2.2	$	2.5	$	3.3	$	2.3	$	1.6	$	2.1
Interest Cost	51.9		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 Loss	1.1		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


Six Months Ended June 30, 2025	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	47.9	$	4.4	$	4.6	$	6.3	$	4.6	$	3.0	$	3.8
Interest Cost	105.6		8.8		12.5		12.4		9.7		5.2		6.2
Expected Return on Plan Assets	(140.5)		(11.1)		(18.8)		(19.4)		(14.7)		(7.7)		(7.3)

Amortization of Net Actuarial Loss	8.1		0.7		0.9		0.9		0.7		0.3		0.5
Net Periodic Benefit Cost (Credit)	$	21.1	$	2.8	$	(0.8)	$	0.2	$	0.3	$	0.8	$	3.2


Six Months Ended June 30, 2024	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	51.2	$	4.4	$	4.9	$	6.6	$	4.7	$	3.1	$	4.0
Interest Cost	103.8		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 Loss	2.2		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

(a)Excludes an immaterial settlement amount to a non-qualified pension plan in the second quarter of 2024 for AEP. See Note 12 - Voluntary Severance Program for additional information.


Three Months Ended June 30, 2025	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	1.0	$	0.1	$	0.2	$	0.2	$	0.1	$	0.1	$	—
Interest Cost	8.6		0.7		1.3		0.9		0.9		0.5		0.6
Expected Return on Plan Assets	(28.3)		(2.4)		(4.1)		(3.3)		(3.0)		(1.5)		(1.9)
Amortization of Prior Service Credit	(0.6)		(0.1)		(0.1)		(0.1)		—		(0.1)		(0.1)
Amortization of Net Actuarial Gain	(0.3)		—		(0.1)		—		—		—		—
Net Periodic Benefit Credit	$	(19.6)	$	(1.7)	$	(2.8)	$	(2.3)	$	(2.0)	$	(1.0)	$	(1.4)


Three Months Ended June 30, 2024	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	1.1	$	0.1	$	0.1	$	0.2	$	0.1	$	—	$	0.1
Interest Cost	10.6		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 Loss	0.7		—		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)


Six Months Ended June 30, 2025	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	1.8	$	0.2	$	0.3	$	0.3	$	0.2	$	0.1	$	0.1
Interest Cost	17.2		1.3		2.7		1.9		1.7		0.9		1.1
Expected Return on Plan Assets	(56.5)		(4.7)		(8.2)		(6.7)		(5.9)		(3.0)		(3.8)
Amortization of Prior Service Credit	(1.2)		(0.1)		(0.2)		(0.2)		(0.1)		(0.1)		(0.1)
Amortization of Net Actuarial Gain	(0.6)		—		(0.2)		—		—		—		—
Net Periodic Benefit Credit	$	(39.3)	$	(3.3)	$	(5.6)	$	(4.7)	$	(4.1)	$	(2.1)	$	(2.7)


Six Months Ended June 30, 2024	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	2.2	$	0.2	$	0.2	$	0.3	$	0.2	$	0.1	$	0.2
Interest Cost	21.1		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 Loss	1.5		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)

(a)Excludes an immaterial amount related to special termination benefits resulting from the voluntary severance program announced in the second quarter of 2024. See Note 12 - Voluntary Severance Program for additional information.