Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2023

Components of Net Periodic Benefit Cost

Pension Plans

Three Months Ended June 30, 2023	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	23.6	$	2.1	$	2.2	$	3.0	$	2.1	$	1.4	$	1.9
Interest Cost	54.8		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 Loss	0.4		—		—		—		—		—		—
Net Periodic Benefit Cost (Credit)	$	(6.0)	$	(0.3)	$	(2.3)	$	(1.9)	$	(1.4)	$	(0.5)	$	0.5

Three Months Ended June 30, 2022	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	30.8	$	2.8	$	2.8	$	4.1	$	2.9	$	1.8	$	2.7
Interest Cost	37.1		3.0		4.4		4.2		3.2		1.7		2.3
Expected Return on Plan Assets	(63.3)		(5.2)		(8.1)		(8.1)		(6.2)		(3.4)		(3.6)
Amortization of Net Actuarial Loss	15.7		1.3		1.8		1.7		1.4		0.8		0.9
Net Periodic Benefit Cost	$	20.3	$	1.9	$	0.9	$	1.9	$	1.3	$	0.9	$	2.3

Six Months Ended June 30, 2023	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	47.2	$	4.1	$	4.5	$	6.0	$	4.2	$	2.8	$	3.8
Interest Cost	109.6		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 Loss	0.7		—		—		—		—		—		—
Net Periodic Benefit Cost (Credit)	$	(12.1)	$	(0.7)	$	(4.6)	$	(3.7)	$	(2.9)	$	(1.0)	$	1.1

Six Months Ended June 30, 2022	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	61.6	$	5.6	$	5.7	$	8.1	$	5.6	$	3.7	$	5.3
Interest Cost	74.1		6.0		8.8		8.4		6.6		3.5		4.6
Expected Return on Plan Assets	(126.7)		(10.5)		(16.2)		(16.1)		(12.4)		(6.8)		(7.3)
Amortization of Net Actuarial Loss	31.5		2.6		3.6		3.5		2.8		1.5		1.9
Net Periodic Benefit Cost	$	40.5	$	3.7	$	1.9	$	3.9	$	2.6	$	1.9	$	4.5

OPEB

Three Months Ended June 30, 2023	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	1.2	$	0.1	$	0.2	$	0.2	$	0.1	$	—	$	0.1
Interest Cost	11.5		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 Loss	3.7		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)

Three Months Ended June 30, 2022	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	1.9	$	0.1	$	0.2	$	0.3	$	0.1	$	0.1	$	0.2
Interest Cost	7.3		0.5		1.1		0.9		0.8		0.3		0.4
Expected Return on Plan Assets	(27.5)		(2.2)		(4.0)		(3.5)		(2.9)		(1.5)		(1.8)
Amortization of Prior Service Credit	(17.9)		(1.5)		(2.6)		(2.5)		(1.8)		(1.1)		(1.3)
Net Periodic Benefit Credit	$	(36.2)	$	(3.1)	$	(5.3)	$	(4.8)	$	(3.8)	$	(2.2)	$	(2.5)

Six Months Ended June 30, 2023	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	2.3	$	0.2	$	0.3	$	0.4	$	0.2	$	0.1	$	0.2
Interest Cost	23.1		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 Loss	7.4		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)

Six Months Ended June 30, 2022	AEP		AEP Texas		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Service Cost	$	3.7	$	0.2	$	0.4	$	0.5	$	0.3	$	0.2	$	0.3
Interest Cost	14.6		1.1		2.3		1.7		1.5		0.7		0.9
Expected Return on Plan Assets	(55.0)		(4.5)		(8.1)		(6.9)		(5.9)		(3.0)		(3.7)
Amortization of Prior Service Credit	(35.7)		(3.0)		(5.2)		(4.9)		(3.6)		(2.2)		(2.6)
Net Periodic Benefit Credit	$	(72.4)	$	(6.2)	$	(10.6)	$	(9.6)	$	(7.7)	$	(4.3)	$	(5.1)