Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2023

Components of Net Periodic Benefit Cost

Pension Plans

Three Months Ended September 30, 2023	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	23.6	$	2.1	$	2.3	$	2.9	$	2.1	$	1.4	$	2.0
Interest Cost	54.8		4.5		6.6		6.3		5.0		2.7		3.4
Expected Return on Plan Assets	(84.8)		(7.0)		(11.2)		(11.0)		(8.6)		(4.6)		(4.8)
Amortization of Net Actuarial Loss	0.3		—		—		—		—		—		—
Net Periodic Benefit Cost (Credit)	$	(6.1)	$	(0.4)	$	(2.3)	$	(1.8)	$	(1.5)	$	(0.5)	$	0.6

Three Months Ended September 30, 2022	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	30.7	$	2.8	$	2.9	$	4.0	$	2.8	$	1.8	$	2.7
Interest Cost	37.1		3.1		4.3		4.3		3.4		1.8		2.2
Expected Return on Plan Assets	(63.4)		(5.3)		(8.1)		(8.1)		(6.2)		(3.3)		(3.6)
Amortization of Net Actuarial Loss	15.8		1.2		1.9		1.8		1.3		0.7		0.9
Net Periodic Benefit Cost	$	20.2	$	1.8	$	1.0	$	2.0	$	1.3	$	1.0	$	2.2

Nine Months Ended September 30, 2023	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	70.8	$	6.2	$	6.8	$	8.9	$	6.3	$	4.2	$	5.8
Interest Cost	164.4		13.7		19.8		18.7		14.9		8.1		10.4
Expected Return on Plan Assets	(254.4)		(21.0)		(33.5)		(33.1)		(25.6)		(13.8)		(14.5)
Amortization of Net Actuarial Loss	1.0		—		—		—		—		—		—
Net Periodic Benefit Cost (Credit)	$	(18.2)	$	(1.1)	$	(6.9)	$	(5.5)	$	(4.4)	$	(1.5)	$	1.7

Nine Months Ended September 30, 2022	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	92.3	$	8.4	$	8.6	$	12.1	$	8.4	$	5.5	$	8.0
Interest Cost	111.2		9.1		13.1		12.7		10.0		5.3		6.8
Expected Return on Plan Assets	(190.1)		(15.8)		(24.3)		(24.2)		(18.6)		(10.1)		(10.9)
Amortization of Net Actuarial Loss	47.3		3.8		5.5		5.3		4.1		2.2		2.8
Net Periodic Benefit Cost	$	60.7	$	5.5	$	2.9	$	5.9	$	3.9	$	2.9	$	6.7

OPEB

Three Months Ended September 30, 2023	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	1.1	$	0.1	$	0.1	$	0.1	$	0.1	$	0.1	$	—
Interest Cost	11.6		0.9		1.8		1.3		1.2		0.6		0.8
Expected Return on Plan Assets	(27.4)		(2.2)		(4.0)		(3.3)		(2.9)		(1.5)		(1.8)
Amortization of Prior Service Credit	(15.8)		(1.3)		(2.3)		(2.2)		(1.6)		(1.0)		(1.3)
Amortization of Net Actuarial Loss	3.7		0.3		0.6		0.5		0.4		0.2		0.3
Net Periodic Benefit Credit	$	(26.8)	$	(2.2)	$	(3.8)	$	(3.6)	$	(2.8)	$	(1.6)	$	(2.0)

Three Months Ended September 30, 2022	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	1.8	$	0.1	$	0.2	$	0.2	$	0.2	$	0.2	$	0.1
Interest Cost	7.3		0.6		1.2		0.8		0.7		0.4		0.5
Expected Return on Plan Assets	(27.5)		(2.3)		(4.1)		(3.3)		(3.0)		(1.6)		(1.8)
Amortization of Prior Service Credit	(17.9)		(1.5)		(2.6)		(2.4)		(1.8)		(1.1)		(1.4)
Net Periodic Benefit Credit	$	(36.3)	$	(3.1)	$	(5.3)	$	(4.7)	$	(3.9)	$	(2.1)	$	(2.6)

Nine Months Ended September 30, 2023	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	3.4	$	0.3	$	0.4	$	0.5	$	0.3	$	0.2	$	0.2
Interest Cost	34.7		2.7		5.5		4.0		3.5		1.8		2.2
Expected Return on Plan Assets	(82.2)		(6.7)		(12.0)		(10.1)		(8.8)		(4.4)		(5.4)
Amortization of Prior Service Credit	(47.3)		(4.0)		(6.9)		(6.5)		(4.7)		(3.0)		(3.7)
Amortization of Net Actuarial Loss	11.1		0.9		1.7		1.4		1.2		0.6		0.8
Net Periodic Benefit Credit	$	(80.3)	$	(6.8)	$	(11.3)	$	(10.7)	$	(8.5)	$	(4.8)	$	(5.9)

Nine Months Ended September 30, 2022	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	5.5	$	0.3	$	0.6	$	0.7	$	0.5	$	0.4	$	0.4
Interest Cost	21.9		1.7		3.5		2.5		2.2		1.1		1.4
Expected Return on Plan Assets	(82.5)		(6.8)		(12.2)		(10.2)		(8.9)		(4.6)		(5.5)
Amortization of Prior Service Credit	(53.6)		(4.5)		(7.8)		(7.3)		(5.4)		(3.3)		(4.0)
Net Periodic Benefit Credit	$	(108.7)	$	(9.3)	$	(15.9)	$	(14.3)	$	(11.6)	$	(6.4)	$	(7.7)