PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2014

PROPERTY, PLANT AND EQUIPMENT

Summary of property, plant and equipment

Our total property, plant and equipment are summarized below (in thousands).

	December 31,
	2014			2013
Electric plant
Production	$	1,159,140		$	1,035,095
Transmission		288,542			263,398
Distribution		840,761			793,024
General(1)		119,572			115,427
Electric plant		2,408,015			2,206,944
Less accumulated depreciation and amortization		704,596			697,128
Electric plant net of depreciation and amortization		1,703,419			1,509,816
Construction work in progress		110,500			150,636
Net electric plant		1,813,919			1,660,452
Water plant		12,809			12,661
Less accumulated depreciation and amortization		5,102			4,806
Water plant net of depreciation and amortization		7,707			7,855
Construction work in progress		146			—
Net water plant		7,853			7,855
Net electric segment plant		1,821,772			1,668,307
Gas plant
Transmission		11,198			10,550
Distribution		89,712			84,157
General(2)		(21,546	)		(21,873	)
Gas Plant		79,364			72,834
Less accumulated depreciation and amortization		16,405			15,204
Gas plant net of accumulated depreciation		62,959			57,630
Construction work in progress		379			1,156
Net gas plant		63,338			58,786
Other
Fiber		41,394			39,902
Less accumulated depreciation and amortization		17,304			15,599
Non-regulated net of depreciation and amortization		24,090			24,303
Construction work in progress		1,072			538
Net non-regulated property		25,162			24,841
TOTAL NET PLANT AND PROPERTY	$	1,910,272		$	1,751,934

(1)	Includes intangible property of $41.2 and $38.1 million as of December 31, 2014 and 2013, respectively, primarily related to capitalized software and investments in facility upgrades owned by other utilities. Accumulated amortization related to this property in 2014 and 2013 was $15.7 and $13.1 million, respectively.
(2)	Includes intangible property of $0.7 and $0.7 million as of December 31, 2014 and 2013, respectively, primarily related to capitalized software and investments in facility upgrades owned by other utilities. Accumulated amortization related to this property in 2014 and 2013 was $0.5 million and $0.5 million, respectively.

Summary of total provision for depreciation and the depreciation rates for continuing operations

The table below summarizes the total provision for depreciation and the depreciation rates for continuing operations, both capitalized and expensed, for the years ended December 31 (in thousands):

	2014		2013		2012
Provision for depreciation
Regulated — Electric and Water	$	66,600	$	63,192	$	57,467
Regulated — Gas		3,851		3,763		3,602
Non-Regulated		1,891		1,938		1,538
TOTAL		72,342		68,893		62,607
Amortization		2,692		2,492		1,041
TOTAL	$	75,034	$	71,385	$	63,648

	2014			2013			2012
Annual depreciation rates
Electric and water		3.0	%		3.0	%		2.8	%
Gas		5.2	%		5.4	%		5.4	%
Non-Regulated		4.7	%		5.0	%		4.2	%
TOTAL COMPANY		3.0	%		3.1	%		2.9	%

Summary of average depreciation rate for each class of assets

	2014			2013			2012
Annual Weighted Average Depreciation Rate
Electric fixed assets:
Production plant		2.4	%		2.4	%		2.0	%
Transmission plant		2.4	%		2.4	%		2.4	%
Distribution plant		3.6	%		3.6	%		3.6	%
General plant		5.8	%		5.8	%		5.9	%
Water		2.7	%		2.8	%		2.7	%
Gas		5.2	%		5.4	%		5.4	%
Non-regulated		4.7	%		5.0	%		4.2	%