SIGNIFICANT ACCOUNTING MATTERS (Tables)

9 Months Ended

Sep. 30, 2025

Accounting Policies [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents AEP’s basic and diluted EPS calculations included on the statements of income:

	Three Months Ended September 30,
	2025				2024
	(in millions, except per share data)
			$/share				$/share
Earnings Attributable to AEP Common Shareholders	$	972.0			$	959.6
Weighted-Average Number of Basic AEP Common Shares Outstanding	534.9		$	1.82	532.2		$	1.80
Weighted-Average Dilutive Effect	3.1		(0.01)		1.4		—
Weighted-Average Number of Diluted AEP Common Shares Outstanding	538.0		$	1.81	533.6		$	1.80

	Nine Months Ended September 30,
	2025				2024
	(in millions, except per share data)
			$/share				$/share
Earnings Attributable to AEP Common Shareholders	$	2,998.0			$	2,303.0
Weighted-Average Number of Basic AEP Common Shares Outstanding	534.2		$	5.61	529.2		$	4.35
Weighted-Average Dilutive Effect	2.2		(0.02)		1.3		(0.01)
Weighted-Average Number of Diluted AEP Common Shares Outstanding	536.4		$	5.59	530.5		$	4.34

Schedule of Cash and Cash Equivalents

The following tables provide a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the balance sheets that sum to the total of the same amounts shown on the statements of cash flows:

	September 30, 2025
	AEP		AEP Texas		APCo		SWEPCo
	(in millions)
Cash and Cash Equivalents	$	1,067.7	$	0.1	$	3.9	$	2.7
Restricted Cash	39.1		7.3		10.8		7.8
Total Cash, Cash Equivalents and Restricted Cash	$	1,106.8	$	7.4	$	14.7	$	10.5

	December 31, 2024
	AEP		AEP Texas		APCo		SWEPCo
	(in millions)
Cash and Cash Equivalents	$	202.9	$	0.1	$	3.9	$	1.2
Restricted Cash	43.1		23.5		16.2		3.4
Total Cash, Cash Equivalents and Restricted Cash	$	246.0	$	23.6	$	20.1	$	4.6

Restrictions on Cash and Cash Equivalents

The following tables provide a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the balance sheets that sum to the total of the same amounts shown on the statements of cash flows:

	September 30, 2025
	AEP		AEP Texas		APCo		SWEPCo
	(in millions)
Cash and Cash Equivalents	$	1,067.7	$	0.1	$	3.9	$	2.7
Restricted Cash	39.1		7.3		10.8		7.8
Total Cash, Cash Equivalents and Restricted Cash	$	1,106.8	$	7.4	$	14.7	$	10.5

	December 31, 2024
	AEP		AEP Texas		APCo		SWEPCo
	(in millions)
Cash and Cash Equivalents	$	202.9	$	0.1	$	3.9	$	1.2
Restricted Cash	43.1		23.5		16.2		3.4
Total Cash, Cash Equivalents and Restricted Cash	$	246.0	$	23.6	$	20.1	$	4.6

Schedule of Cash Flow, Supplemental Disclosures

	Nine Months Ended September 30,
Cash Flow Information	2025		2024
	(in millions)
Cash Paid (Received) for:
Interest, Net of Capitalized Amounts	$	1,315.1	$	1,247.3
Income Taxes, Net	60.1		87.9
Sale of Transferable Tax Credits	(102.2)		(163.7)
Noncash Investing and Financing Activities:
Acquisitions Under Finance Leases	30.0		24.5
Construction Expenditures Included in Current Liabilities as of September 30,	1,168.8		1,015.1
Acquisition of Nuclear Fuel Included in Current Liabilities as of September 30,	1.4		8.2