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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping The following table presents the carrying amount and fair value of the Registrants' financial instruments at June 30, 2024 and December 31, 2023, as well as the classification level within the fair value hierarchy.

 

 

June 30,
2024

 

 

December 31,
2023

 

 

 

(In millions)

 

Carrying Amount

 

 

Fair
Value

 

 

Carrying Amount

 

 

Fair
Value

 

 

Classification

Long-term Debt (including Long-term Debt due within one year):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OGE Energy Senior Notes

 

$

346.8

 

 

$

352.7

 

 

$

—

 

 

$

—

 

 

Level 2

OGE Energy Term Loan

 

$

59.7

 

 

$

60.0

 

 

$

49.9

 

 

$

50.0

 

 

Level 2

OG&E Senior Notes

 

$

4,147.6

 

 

$

3,831.3

 

 

$

4,146.0

 

 

$

3,922.3

 

 

Level 2

OG&E Revolving Credit Facility

 

$

200.0

 

 

$

200.0

 

 

$

—

 

 

$

—

 

 

Level 2

OG&E Industrial Authority Bonds

 

$

135.4

 

 

$

135.4

 

 

$

135.4

 

 

$

135.4

 

 

Level 2

OG&E Tinker Debt (A)

 

$

11.7

 

 

$

9.3

 

 

$

9.2

 

 

$

7.1

 

 

Level 3

(A) In June 2024, OG&E purchased additional distribution assets at Tinker Air Force Base for $2.6 million, which was a non-cash investing and financing activity.