REGULATORY ASSETS AND LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2024

Regulatory Assets and Liabilities Disclosure [Abstract]


(in millions)	June 30, 2024		December 31, 2023
Regulatory assets
Plant retirement related items (1)	$	137.2	$	38.4
Environmental remediation costs	119.1		121.5
Pension and OPEB costs	63.2		62.0
Income tax related items	55.9		57.2
AROs	18.9		18.8
Bluewater Natural Gas Holding, LLC	13.1		11.9
ReACT™	9.1		10.4
Uncollectible expense	8.2		8.9
Derivatives	5.0		12.5
Other, net	26.9		19.0
Total regulatory assets	$	456.6	$	360.6

(1) Included in plant retirement related items at June 30, 2024, are $96.5 million of capitalized retirement costs related to the new EPA CCR Rule that was enacted in April 2024. See Note 19, Commitments and Contingencies, for more information.

Schedule of regulatory liabilities


(in millions)	June 30, 2024		December 31, 2023
Regulatory liabilities
Income tax related items	$	326.9	$	331.4
Removal costs	200.6		191.2
Pension and OPEB benefits	86.9		85.3
Energy costs refundable through rate adjustments	59.3		36.3
Derivatives	9.5		4.1
Other, net	30.2		32.2
Total regulatory liabilities	$	713.4	$	680.5

Balance sheet presentation
Other current liabilities	$	7.8	$	8.5
Regulatory liabilities	705.6		672.0
Total regulatory liabilities	$	713.4	$	680.5