RETIREMENT PLAN AND POST-RETIREMENT BENEFITS (Tables)

6 Months Ended

Jun. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

NVE
	Pension Benefits					Other Postretirement Benefits
		For the Three Months Ended June 30,				For the Three Months Ended June 30,
		2013		2012		2013		2012
Service cost	$	5,132	$	4,406	$	660	$	595
Interest cost		9,303		10,228		1,677		1,905
Expected return on plan assets		(12,708)		(12,447)		(1,687)		(1,563)
Amortization of prior service cost		(720)		(724)		(952)		(987)
Amortization of net loss		4,797		3,473		890		731
Net periodic benefit cost	$	5,804	$	4,936	$	588	$	681
	Pension Benefits				Other Postretirement Benefits
	For the Six Months Ended June 30,				For the Six Months Ended June 30,
		2013		2012		2013		2012
Service cost	$	10,264	$	8,813	$	1,320	$	1,191
Interest cost		18,607		20,456		3,353		3,810
Expected return on plan assets		(25,416)		(24,894)		(3,373)		(3,126)
Amortization of prior service cost		(1,441)		(1,448)		(1,905)		(1,974)
Amortization of net loss		9,594		6,945		1,781		1,462
Net periodic benefit cost	$	11,608	$	9,872	$	1,176	$	1,363
The average percentage of NVE net periodic costs capitalized during 2013 and 2012 was 34.6% and 34.6%, respectively.

NPC
	Pension Benefits				Other Postretirement Benefits
		For the Three Months Ended June 30,				For the Three Months Ended June 30,
		2013		2012		2013		2012
Service cost	$	2,761	$	2,358	$	389	$	350
Interest cost		4,453		4,881		556		602
Expected return on plan assets		(6,270)		(6,237)		(631)		(592)
Amortization of prior service cost		(453)		(456)		(23)		229
Amortization of net loss		2,117		1,363		289		221
Net periodic benefit cost	$	2,608	$	1,909	$	580	$	810
	Pension Benefits				Other Postretirement Benefits
		For the Six Months Ended June 30,				For the Six Months Ended June 30,
		2013		2012		2013		2012
Service cost	$	5,522	$	4,715	$	778	$	700
Interest cost		8,905		9,762		1,111		1,205
Expected return on plan assets		(12,540)		(12,474)		(1,261)		(1,183)
Amortization of prior service cost		(905)		(912)		(46)		458
Amortization of net loss		4,234		2,726		578		441
Net periodic benefit cost	$	5,216	$	3,817	$	1,160	$	1,621
The average percentage of NPC net periodic costs capitalized during 2013 and 2012 was 35.7% and 36.6%, respectively.

SPPC
	Pension Benefits				Other Postretirement Benefits
	For the Three Months Ended June 30,				For the Three Months Ended June 30,
	2013		2012		2013		2012
Service cost	$	1,926	$	1,695	$	251	$	227
Interest cost		4,558		5,043		1,104		1,283
Expected return on plan assets		(6,162)		(5,937)		(1,022)		(941)
Amortization of prior service cost		(277)		(277)		(933)		(1,220)
Amortization of net loss		2,501		2,026		592		504
Net periodic benefit cost	$	2,546	$	2,550	$	(8)	$	(147)
	Pension Benefits				Other Postretirement Benefits
	For the Six Months Ended June 30,				For the Six Months Ended June 30,
	2013		2012		2013		2012
Service cost	$	3,852	$	3,391	$	501	$	455
Interest cost		9,117		10,086		2,207		2,566
Expected return on plan assets		(12,324)		(11,875)		(2,043)		(1,882)
Amortization of prior service cost		(554)		(554)		(1,866)		(2,439)
Amortization of net loss		5,001		4,052		1,185		1,007
Net periodic benefit cost	$	5,092	$	5,100	$	(16)	$	(293)
The average percentage of SPPC net periodic costs capitalized during 2013 and 2012 was 35.6% and 34.5%, respectively.