Debt (Tables)

12 Months Ended

Dec. 31, 2025

Debt Instrument [Line Items]

Long-term Debt

$ in millions	Interest Rate	Maturity	December 31, 2025		December 31, 2024
AES Ohio debt
First Mortgage Bonds	3.95%	2049	$	425.0	$	425.0
First Mortgage Bonds	3.20%	2040	140.0		140.0
First Mortgage Bonds	5.70%	2033	107.5		107.5
First Mortgage Bonds	5.19%	2033	100.0		100.0
First Mortgage Bonds	4.55%	2030	375.0		—
First Mortgage Bonds	5.49%	2028	92.5		92.5
Tax-exempt First Mortgage Bonds (a)	4.25%	2027	100.0		100.0
Tax-exempt First Mortgage Bonds (b)	4.00%	2027	40.0		40.0
U.S. Government note	4.20%	2061	16.4		16.6
Unamortized deferred financing costs			(9.1)		(6.6)
Unamortized debt discounts			(2.5)		(2.1)
Total long-term debt at AES Ohio			1,384.8		1,012.9
Senior unsecured notes	4.125%	2025	—		415.0
Senior unsecured notes	4.35%	2029	400.0		400.0
Note to DPL Capital Trust II (c)	8.125%	2031	15.6		15.6
Unamortized deferred financing costs			(1.7)		(2.9)
Unamortized debt discounts			(0.4)		(0.6)
Total long-term debt			1,798.3		1,840.0
Less: current portion			(0.2)		(414.4)
Long-term debt, net of current portion			$	1,798.1	$	1,425.6

(a)First mortgage bonds issued to the OAQDA, to secure the loan of proceeds from tax-exempt bonds issued by the OAQDA. The bonds have a final maturity date of November 1, 2040 but are subject to a mandatory put in June 2027.

(b)First mortgage bonds issued to the OAQDA, to secure the loan of proceeds from tax-exempt bonds issued by the OAQDA. The bonds have a final maturity date of January 1, 2034 but are subject to a mandatory put in June 2027.

(c)    Note payable to related party. See Note 11. Related Party Transactions for more information.

Long-term Debt Maturities

At December 31, 2025, maturities of long-term debt are summarized as follows:

Due during the years ending December 31,	$ in millions
2026	$	0.2
2027	140.2
2028	92.7
2029	400.2
2030	375.2
Thereafter	803.5
	1,812.0
Unamortized debt discounts	(2.9)
Deferred financing costs, net	(10.8)
Total long-term debt	$	1,798.3