At December 31, 2011 and 2010, NPC and SPPC owned the following undivided interests in jointly owned electric utility facilities (dollars in thousands):

		2011

			Plant in		Accumulated		Net Plant in
		% Owned	Service		Depreciation		Service		CWIP

NPC
	Navajo Generating Station	11.3%	$	270,448	$	148,582	$	121,866	$	1,117
	Reid Gardner Generating Station No. 4	32.2%		171,485		97,042		74,443		7,600
	Silverhawk Generating Station	75.0%		247,342		50,822		196,520		203
			$	689,275	$	296,446	$	392,829	$	8,920
SPPC
	Valmy Generating Station	50.0%	$	331,753	$	215,642	$	116,111	$	6,682

		2010
			Plant in		Accumulated		Net Plant in
		% Owned	Service		Depreciation		Service		CWIP

NPC
	Navajo Generating Station	11.3%	$	249,646	$	141,326	$	108,320	$	1
	Reid Gardner Generating Station No. 4	32.2%		165,795		98,047		67,748		21,016
	Silverhawk Generating Station	75.0%		250,790		47,194		203,596		183
			$	666,231	$	286,567	$	379,664	$	21,200
SPPC
	Valmy Generating Station	50.0%	$	313,378	$	210,165	$	103,213	$	5,605

The amounts for Navajo Generating Station include NPC's share of transmission systems, general plant equipment and NPC's share of the jointly owned railroad which delivers coal to the plant. Each participant provides its own financing for all these jointly owned facilities. NPC's share of the operating expenses for these facilities is included in the corresponding operating expenses in its consolidated statement of income.

Reid Gardner Generating Station Unit No. 4 is owned by the CDWR (67.8%) and NPC (32.2%). NPC is the operating agent. Contractually, NPC is entitled to receive 25 MW of base load capacity and 232 MW of peaking capacity, subject to certain operating limitations. The contract expires in 2013. NPC's share of the operating expenses for this facility is included in the corresponding operating expenses in its consolidated income statements.

NPC is the operator of the Silverhawk Generating Station, which is jointly owned with SNWA. NPC's owns 75% and its share of direct operation and maintenance expenses is included in its accompanying consolidated income statements.

SPPC and Idaho Power Company each own a 50% undivided interest in the Valmy Generating Station, with each company being responsible for financing its share of capital and operating costs. SPPC is the operator of the plant for both parties. SPPC's share of direct operation and maintenance expenses for Valmy Generating Station are included in its accompanying consolidated income statements.