At December 31, 2012 and 2011, NPC and SPPC owned the following undivided interests in jointly owned electric utility facilities (dollars in thousands):

		2012

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

NPC
	Navajo Generating Station	11.3%	$	253,711	$	149,969	$	103,742	$	5,601
	Reid Gardner Generating Station No. 4	32.2%		184,474		100,277		84,197		9,141
	Silverhawk Generating Station	75.0%		247,581		53,235		194,346		2,358
			$	685,766	$	303,481	$	382,285	$	17,100
SPPC
	Valmy Generating Station	50.0%	$	336,038	$	214,335	$	121,703	$	10,808

		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

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 income statements.

Reid Gardner Generating Station Unit No. 4 is owned by the CDWR (67.8%) and Nevada Power Company (32.2%). Nevada power is 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. NPC's share of the operating expenses for this facility is included in the corresponding operating expenses in its consolidated income statements. In June 2013, NPC will be required to pay CDWR a termination payment. After such payment is made, NPC will be 100% owner of Unit No. 4 and assume 100% of all operating and maintenance costs of the Unit.

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