RELATED PARTY TRANSACTIONS (Tables)

12 Months Ended

Dec. 31, 2025

Related Party Transactions [Abstract]

Schedule of Related Party Transactions

haritable contributions were recorded in Other Operation expenses on the statements of income as follows for the year ended December 31, 2025:

	AEP		AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Contributions to AEP Foundation	$	10	$	1	$	2	$	2	$	1	$	1	$	1	$	1

The affiliated companies recorded these costs paid to I&M as fuel expenses or other operation expenses.  The amounts of affiliated expenses were:

	Years Ended December 31,
Company	2025		2024		2023
	(in millions)
AEGCo	$	15	$	10	$	9
APCo	36		47		39
WPCo	7		8		11

The following table shows the net transmission service charges recorded by the Registrant Subsidiaries:

	Years Ended December 31,
Company	2025		2024		2023
	(in millions)
AEP Texas	$	31	$	31	$	29
APCo	440		381		365
I&M	269		253		226
OPCo	789		696		665
PSO	171		127		100
SWEPCo	84		65		49

Schedule of Affiliated Revenues

The tables below represent revenues from affiliates, net of respective provisions for refund, by type of revenue for the Registrant Subsidiaries. Related party revenues are shown in Sales to AEP Affiliates, Provision for Refund - Affiliated and Other Revenues - Affiliated, respectively, on the Registrant Subsidiaries’ statements of income. 

Related Party Revenues	AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2025
Direct Sales to East Affiliates	$	—	$	—	$	165	$	—	$	—	$	—	$	—
Direct Sales to West Affiliates	—		—		—		—		—		4		—
Transmission Revenues	—		1,848		99		(1)		13		—		81
Other Revenues	5		21		15		70		32		5		2
Total Affiliated Revenues	$	5	$	1,869	$	279	$	69	$	45	$	9	$	83

Related Party Revenues	AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2024
Direct Sales to East Affiliates	$	—	$	—	$	159	$	—	$	—	$	—	$	—
Transmission Revenues	—		1,491		79		(9)		(7)		—		61
Other Revenues	5		21		10		75		30		7		1
Total Affiliated Revenues	$	5	$	1,512	$	248	$	66	$	23	$	7	$	62

Related Party Revenues	AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Year Ended December 31, 2023
Direct Sales to East Affiliates	$	—	$	—	$	159	$	—	$	—	$	—	$	—
Transmission Revenues	—		1,304		71		(11)		3		—		45
Barging, Urea Transloading and Other Transportation Services	—		—		—		59		—		—		—
Other Revenues	5		13		9		9		28		1		2
Total Affiliated Revenues	$	5	$	1,317	$	239	$	57	$	31	$	1	$	47