Exhibit 12b

Tucson Electric Power Company
Computation of Ratio of Earnings to Fixed Charges

	12 Months Ended
	Dec. 31,		Dec. 31,			Dec. 31,		Dec. 31,			Dec. 31,			Dec. 31,
	2009		2008			2007		2006			2005			2004
	- Thousands of Dollars -
Fixed Charges:
Interest on Long-Term Debt	$	36,226	$	47,456		$	50,230	$	51,422		$	56,243		$	69,904
Other Interest (1)		1,571		1,367			4,538		6,436			2,597			1,263
Interest on Capital Lease Obligations		53,670		57,252			64,477		72,556			79,064			85,869
Estimated Interest Portion of Rental Expense		106		130			160		188			216			243
Total Fixed Charges	$	91,573	$	106,205		$	119,405	$	130,602		$	138,120		$	157,279
Net Income	$	89,248	$	4,363		$	53,456	$	66,745		$	48,267		$	46,127
Less:
Cumulative Effect of Accounting Change — Net of Tax		—		—			—		—			(626	)		—
Net Income from Continuing Operations		89,248		4,363			53,456		66,745			48,893			46,127
Add (Deduct):
Income from Equity Investees (2)		—		(1,381	)		—		(320	)		(314	)		(131	)
Income Taxes		55,130		10,867			35,542		42,478			33,907			34,815
Total Fixed Charges		91,573		106,205			119,405		130,602			138,120			157,279
Total Earnings before Taxes and Fixed Charges	$	235,951	$	120,054		$	208,403	$	239,505		$	220,606		$	238,090
Ratio of Earnings to Fixed Charges		2.577		1.130			1.745		1.834			1.597			1.514

(1)	Excludes recognition of Allowance for Borrowed Funds Used During Construction.
(2)	Inncom International, Inc. (income) losses.