CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating activities
Net income	$ 131.0	$ 111.1
Reconciliation to cash provided by operating activities
Depreciation and amortization	132.5	118.3
Deferred income taxes and ITCs, net	17.9	40.1
Change in –
Accounts receivable and unbilled revenues, net	(9.0)	31.5
Materials, supplies, and inventories	8.9	11.6
Prepaid taxes	6.7	(11.0)
Other prepayments	4.4	0.9
Other current assets	0.4	5.6
Accounts payable	(19.5)	(40.1)
Amounts refundable to customers	9.1	(0.7)
Other current liabilities	(6.9)	(4.3)
Other, net	(3.9)	3.4
Net cash provided by operating activities	271.6	266.4
Investing activities
Capital expenditures	(253.6)	(195.9)
Reimbursement for ATC's transmission infrastructure upgrades	6.6	0.0
Proceeds from cash surrender value of life insurance	9.8	0.0
Other, net	3.4	2.9
Net cash used in investing activities	(233.8)	(193.0)
Financing activities
Change in short-term debt	21.5	(38.9)
Payment of dividends to parent	(60.0)	(110.0)
Equity contribution from parent	0.0	75.0
Other, net	(0.5)	(0.9)
Net cash used in financing activities	(39.0)	(74.8)
Net change in cash and cash equivalents	(1.2)	(1.4)
Cash and cash equivalents at beginning of period	1.5	1.4
Cash and cash equivalents at end of period	$ 0.3	$ 0.0