Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues	$ 254.3	$ 226.4
OPERATING COSTS AND EXPENSES:
Net purchased power	95.1	89.7
Operation and maintenance	65.5	60.9
Depreciation and amortization	29.2	22.6
Taxes other than income taxes	36.3	29.2
Loss on asset disposal	0.0	1.3
Costs and Expenses	226.1	203.7
OPERATING INCOME	28.2	22.7
OTHER INCOME / (EXPENSE), NET:
Interest expense, net	(23.9)	(20.3)
Other income / (expense), net	(0.6)	1.8
Total other expense, net	(24.5)	(18.5)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	3.7	4.2
Income tax expense	1.0	1.6
NET INCOME	2.7	2.6
Subsidiaries [Member]
Revenues	252.1	224.3
OPERATING COSTS AND EXPENSES:
Net purchased power	94.8	89.5
Operation and maintenance	63.9	60.7
Depreciation and amortization	28.8	22.1
Taxes other than income taxes	36.2	29.2
Costs and Expenses	223.7	202.6
OPERATING INCOME	28.4	21.7
OTHER INCOME / (EXPENSE), NET:
Interest expense, net	(14.7)	(11.2)
Other income / (expense), net	(1.3)	1.2
Total other expense, net	(16.0)	(10.0)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	12.4	11.7
Income tax expense	1.7	2.3
NET INCOME	$ 10.7	$ 9.4