RETIREMENT PLAN AND POST-RETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 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 March 31,				For the Three Months Ended March 31,
		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
The average percentage of NVE net periodic costs capitalized during 2013 and 2012 was 33.8% and 33.2%, respectively.

NPC
	Pension Benefits				Other Postretirement Benefits
		For the Three Months Ended March 31,				For the Three Months Ended March 31,
		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
The average percentage of NPC net periodic costs capitalized during 2013 and 2012 was 35.1% and 35.6%, respectively.

SPPC
	Pension Benefits				Other Postretirement Benefits
	For the Three Months Ended March 31,				For the Three Months Ended March 31,
	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)
The average percentage of SPPC net periodic costs capitalized during 2013 and 2012 was 34.4% and 33.0%, respectively.