EXHIBIT 12

PUBLIC SERVICE COMPANY OF OKLAHOMA

Computation of Consolidated Ratios of Earnings to Fixed Charges

(in thousands except ratio data) 

	Year Ended December 31,															Twelve Months Ended
	2000			2001			2002			2003			2004			9/30/05
FIXED CHARGES
Interest on Long-term Debt	$	26,473		$	29,305		$	28,401		$	39,631		$	35,152		$	33,555
Interest on Short-term Debt		10,902			9,513			6,508			2,511			3,021			2,029
Distributions on Trust Preferred Securities		6,000			6,000			6,000			3,000			-			-
Estimated Interest Element in Lease     Rentals		1,090			1,337			1,468			1,645			1,300			1,300
Total Fixed Charges	$	44,465		$	46,155		$	42,377		$	46,787		$	39,473		$	36,884
EARNINGS
Net Income	$	66,663		$	57,759		$	41,060		$	53,891		$	37,542		$	67,903
Plus Federal Income Taxes (Credits)		8,571			45,484			(43,956	)		47,581			(12,145	)		(21,211	)
Plus State Income Taxes (Credits)		1,721			8,928			(7,529	)		6,688			(289	)		1,939
Plus Provision for Deferred Income Taxes		25,453			(17,751	)		75,659			(14,641	)		22,034			44,176
Plus Deferred Investment Tax Credits		(1,791	)		(1,791	)		(1,791	)		(1,790	)		(1,791	)		(1,537	)
Plus Fixed Charges (as above)		44,465			46,155			42,377			46,787			39,473			36,884
Total Earnings	$	145,082		$	138,784		$	105,820		$	138,516		$	84,824		$	128,154
Ratio of Earnings to Fixed Charges		3.26			3.00			2.49			2.96			2.14			3.47

Certain amounts have been reclassified between interest on short-term and long-term debt compared to periods prior to January 1, 2002.  This reclassification had no effect on the ratio.

Certain amounts have been reclassified between Distributions on Trust Preferred Securities and Interest on Long-term Debt due to the implementation of FIN 46R "Consolidation of Variable Interest Entities" effective March 31, 2004, on a prospective basis.  This reclassification had no effect on this ratio.