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Debt (Tables)
 3 Months Ended
Mar. 31, 2024
Debt Instrument [Line Items]  
Long-term Debt DEBT
Long-term debt is as follows:
InterestMarch 31,December 31,
$ in millionsRateDue20242023
AES Ohio debt
First Mortgage Bonds3.95 %2049$425.0 $425.0 
First Mortgage Bonds3.20 %2040140.0 140.0 
First Mortgage Bonds5.70 %2033107.5 107.5 
First Mortgage Bonds5.19 %2033100.0 100.0 
First Mortgage Bonds5.49 %202892.5 92.5 
Tax-exempt First Mortgage Bonds (a)
4.25 %2027100.0 100.0 
Tax-exempt First Mortgage Bonds (b)
4.00 %202740.0 40.0 
U.S. Government note4.20 %206116.8 16.8 
Unamortized deferred financing costs(6.9)(7.1)
Unamortized debt discounts(2.3)(2.2)
Total long-term debt at AES Ohio1,012.6 1,012.5 
DPL Inc. debt
Senior unsecured bonds4.125 %2025415.0 415.0 
Senior unsecured bonds4.35 %2029400.0 400.0 
Note to DPL Capital Trust II (c)
8.125 %203115.6 15.6 
Unamortized deferred financing costs(4.4)(4.9)
Unamortized debt discounts(0.6)(0.6)
Total DPL consolidated long-term debt1,838.2 1,837.6 
Less: current portion(0.2)(0.2)
DPL consolidated long-term debt, net of current portion$1,838.0 $1,837.4 

(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.

Revolving credit agreements
As of March 31, 2024 and December 31, 2023, the AES Ohio Credit Agreement had outstanding borrowings of $170.0 million and $15.0 million, respectively.

Long-term debt covenants and restrictions
The AES Ohio Credit Agreement and Fifty-Third, Fifty-Fourth and Fifty-Fifth Supplemental Indentures to the First Mortgage, pursuant to which the 3.20% Bonds due 2040, the 5.19% Bonds due 2033, the 5.49% Bonds due 2028 and the 5.70% Bonds due 2033 were issued, respectively, each contain one financial covenant. The covenant measures Total Debt to Total Capitalization and is calculated, at the end of each fiscal quarter, by dividing total debt at the end of the quarter by total capitalization at the end of the quarter. AES Ohio’s Total Debt to Total Capitalization ratio shall not be greater than 0.67 to 1.00. As of March 31, 2024, AES Ohio was in compliance with this financial covenant.

AES Ohio does not have any meaningful restrictions in its debt financing documents prohibiting dividends and return of capital payments to its parent, DPL. As of March 31, 2024, AES Ohio was in compliance with all debt covenants, including the financial covenant described above.

Substantially all property, plant & equipment of AES Ohio is subject to the lien of the mortgage securing AES Ohio’s First and Refunding Mortgage.
Schedule of Long-term Debt Instruments :
InterestMarch 31,December 31,
$ in millionsRateDue20242023
AES Ohio debt
First Mortgage Bonds3.95 %2049$425.0 $425.0 
First Mortgage Bonds3.20 %2040140.0 140.0 
First Mortgage Bonds5.70 %2033107.5 107.5 
First Mortgage Bonds5.19 %2033100.0 100.0 
First Mortgage Bonds5.49 %202892.5 92.5 
Tax-exempt First Mortgage Bonds (a)
4.25 %2027100.0 100.0 
Tax-exempt First Mortgage Bonds (b)
4.00 %202740.0 40.0 
U.S. Government note4.20 %206116.8 16.8 
Unamortized deferred financing costs(6.9)(7.1)
Unamortized debt discounts(2.3)(2.2)
Total long-term debt at AES Ohio1,012.6 1,012.5 
DPL Inc. debt
Senior unsecured bonds4.125 %2025415.0 415.0 
Senior unsecured bonds4.35 %2029400.0 400.0 
Note to DPL Capital Trust II (c)
8.125 %203115.6 15.6 
Unamortized deferred financing costs(4.4)(4.9)
Unamortized debt discounts(0.6)(0.6)
Total DPL consolidated long-term debt1,838.2 1,837.6 
Less: current portion(0.2)(0.2)
DPL consolidated long-term debt, net of current portion$1,838.0 $1,837.4 

(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.
Subsidiaries [Member]  
Debt Instrument [Line Items]  
Long-term Debt DEBT
Long-term debt is as follows:
InterestMarch 31,December 31,
$ in millionsRateDue20242023
First Mortgage Bonds3.95 %2049$425.0 $425.0 
First Mortgage Bonds3.20 %2040140.0 140.0 
First Mortgage Bonds5.70 %2033107.5 107.5 
First Mortgage Bonds5.19 %2033100.0 100.0 
First Mortgage Bonds5.49 %202892.5 92.5 
Tax-exempt First Mortgage Bonds (a)
4.25 %2027100.0 100.0 
Tax-exempt First Mortgage Bonds (b)
4.00 %202740.0 40.0 
U.S. Government note4.20 %206116.8 16.8 
Unamortized deferred financing costs(6.9)(7.1)
Unamortized debt discounts(2.3)(2.2)
Total long-term debt1,012.6 1,012.5 
Less: current portion(0.2)(0.2)
Long-term debt, net of current portion$1,012.4 $1,012.3 

(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.

Revolving credit agreements
As of March 31, 2024 and December 31, 2023, the AES Ohio Credit Agreement had outstanding borrowings of $170.0 million and $15.0 million, respectively.

Long-term debt covenants and restrictions
The AES Ohio Credit Agreement and Fifty-Third, Fifty-Fourth and Fifty-Fifth Supplemental Indentures to the First Mortgage, pursuant to which the 3.20% Bonds due 2040, the 5.19% Bonds due 2033, the 5.49% Bonds due 2028 and the 5.70% Bonds due 2033 were issued, respectively, each contain one financial covenant. The covenant measures Total Debt to Total Capitalization and is calculated, at the end of each fiscal quarter, by dividing total debt at the end of the quarter by total capitalization at the end of the quarter. AES Ohio’s Total Debt to Total Capitalization ratio shall not be greater than 0.67 to 1.00. As of March 31, 2024, AES Ohio was in compliance with this financial covenant.

As of March 31, 2024, AES Ohio was in compliance with all debt covenants, including the financial covenant described above.

AES Ohio does not have any meaningful restrictions in its debt financing documents prohibiting dividends and return of capital payments to its parent, DPL.

Substantially all property, plant & equipment of AES Ohio is subject to the lien of the mortgage securing AES Ohio’s First and Refunding Mortgage.
Schedule of Long-term Debt Instruments
InterestMarch 31,December 31,
$ in millionsRateDue20242023
First Mortgage Bonds3.95 %2049$425.0 $425.0 
First Mortgage Bonds3.20 %2040140.0 140.0 
First Mortgage Bonds5.70 %2033107.5 107.5 
First Mortgage Bonds5.19 %2033100.0 100.0 
First Mortgage Bonds5.49 %202892.5 92.5 
Tax-exempt First Mortgage Bonds (a)
4.25 %2027100.0 100.0 
Tax-exempt First Mortgage Bonds (b)
4.00 %202740.0 40.0 
U.S. Government note4.20 %206116.8 16.8 
Unamortized deferred financing costs(6.9)(7.1)
Unamortized debt discounts(2.3)(2.2)
Total long-term debt1,012.6 1,012.5 
Less: current portion(0.2)(0.2)
Long-term debt, net of current portion$1,012.4 $1,012.3 

(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.

Revolving credit agreements