CONDENSED BALANCE SHEETS - PSO - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
CURRENT ASSETS
Cash and Cash Equivalents	$ 306	$ 197
Accounts Receivable:
Customers	1,338	1,166
Miscellaneous	53	60
Total Accounts Receivable	2,970	2,867
Fuel	567	576
Materials and Supplies	1,098	1,046
Risk Management Assets	246	352
Accrued Tax Benefits	214	85
Regulatory Asset for Under-Recovered Fuel Costs	594	426
Prepayments and Other Current Assets	385	212
TOTAL CURRENT ASSETS	6,623	6,052
PROPERTY, PLANT AND EQUIPMENT
Generation	28,879	28,388
Transmission	43,093	42,557
Distribution	33,902	33,364
Other Property, Plant and Equipment	9,119	8,635
Construction Work in Progress	8,314	7,635
Total Property, Plant and Equipment	123,307	120,579
Accumulated Depreciation and Amortization	28,453	28,205
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET	94,854	92,374
OTHER NONCURRENT ASSETS
Regulatory Assets	5,070	4,804
Prepayments & Other Current Assets	650	661
Deferred Charges and Other Noncurrent Assets	4,578	4,402
TOTAL OTHER NONCURRENT ASSETS	16,299	16,034
TOTAL ASSETS	117,776	114,460
CURRENT LIABILITIES
Accounts Payable	3,148	3,429
Long-term Debt Due Within One Year	2,704	3,194
Risk Management Liabilities	130	132
Customer Deposits	521	507
Accrued Taxes	1,888	2,002
Accrued Interest	629	544
Obligations Under Operating Leases	95	100
Other Current Liabilities	1,924	1,898
TOTAL CURRENT LIABILITIES	12,594	13,314
NONCURRENT LIABILITIES
Long-term Debt	46,850	44,128
Deferred Income Taxes	11,249	10,951
Regulatory Liabilities and Deferred Investment Tax Credits	8,230	8,362
Accounts Payables	3,607	3,556
Obligations Under Operating Leases	572	578
Deferred Credits and Other Noncurrent Liabilities	1,235	905
TOTAL NONCURRENT LIABILITIES	72,153	68,890
TOTAL LIABILITIES	84,747	82,204
Rate Matters (Note 4)
Commitments, Guarantees and Contingencies (Note 5)
COMMON SHAREHOLDER’S EQUITY
Common Stock	3,544	3,523
Paid-in Capital	12,447	12,138
Retained Earnings	15,795	15,441
Accumulated Other Comprehensive Income (Loss)	22	36
TOTAL COMMON SHAREHOLDER’S EQUITY	31,808	31,138
TOTAL LIABILITIES AND EQUITY	117,776	114,460
PUBLIC SERVICE COMPANY OF OKLAHOMA
CURRENT ASSETS
Cash and Cash Equivalents	2	2
Accounts Receivable:
Customers	115	109
Affiliated Companies	84	45
Miscellaneous	5	4
Total Accounts Receivable	204	158
Fuel	3	3
Materials and Supplies	125	119
Risk Management Assets	21	42
Accrued Tax Benefits	79	8
Regulatory Asset for Under-Recovered Fuel Costs	58	37
Prepayments and Other Current Assets	17	14
TOTAL CURRENT ASSETS	509	383
PROPERTY, PLANT AND EQUIPMENT
Generation	4,093	4,365
Transmission	1,490	1,433
Distribution	4,059	3,987
Other Property, Plant and Equipment	1,290	1,292
Construction Work in Progress	682	635
Total Property, Plant and Equipment	11,614	11,712
Accumulated Depreciation and Amortization	2,455	2,748
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET	9,159	8,964
OTHER NONCURRENT ASSETS
Regulatory Assets	676	637
Employee Benefits and Pension Assets	95	95
Prepayments & Other Current Assets	124	126
Deferred Charges and Other Noncurrent Assets	72	13
TOTAL OTHER NONCURRENT ASSETS	967	871
TOTAL ASSETS	10,635	10,218
CURRENT LIABILITIES
Advances from Affiliates	487	171
Long-term Debt Due Within One Year	51	51
Risk Management Liabilities	30	27
Customer Deposits	116	115
Accrued Taxes	88	37
Accrued Interest	37	67
Obligations Under Operating Leases	12	11
Other Current Liabilities	78	104
TOTAL CURRENT LIABILITIES	1,263	1,009
NONCURRENT LIABILITIES
Long-term Debt	3,475	3,475
Deferred Income Taxes	1,124	1,113
Regulatory Liabilities and Deferred Investment Tax Credits	717	717
Accounts Payables	148	136
Obligations Under Operating Leases	120	122
Deferred Credits and Other Noncurrent Liabilities	160	33
TOTAL NONCURRENT LIABILITIES	5,744	5,596
TOTAL LIABILITIES	7,007	6,605
Rate Matters (Note 4)
Commitments, Guarantees and Contingencies (Note 5)
COMMON SHAREHOLDER’S EQUITY
Common Stock	157	157
Paid-in Capital	1,718	1,718
Retained Earnings	1,751	1,736
Accumulated Other Comprehensive Income (Loss)	2	2
TOTAL COMMON SHAREHOLDER’S EQUITY	3,628	3,613
TOTAL LIABILITIES AND EQUITY	10,635	10,218
PUBLIC SERVICE COMPANY OF OKLAHOMA | Nonrelated Party
CURRENT LIABILITIES
Accounts Payable	263	339
PUBLIC SERVICE COMPANY OF OKLAHOMA | Affiliated Entity
CURRENT LIABILITIES
Accounts Payable	$ 101	$ 87