Selected Balance Sheet Data

12 Months Ended

Dec. 31, 2013

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Thousands of Dollars)	Dec. 31, 2013			Dec. 31, 2012
Accounts receivable, net (a)
Accounts receivable	$	64,180		$	55,039
Less allowance for bad debts	(4,911		)	(4,333		)
	$	59,269		$	50,706

^(a)  Accounts receivable, net includes $1,595 and $586 due from affiliates as of Dec. 31, 2013 and 2012, respectively.

(Thousands of Dollars)	Dec. 31, 2013		Dec. 31, 2012
Inventories
Materials and supplies	$	6,437	$	6,172
Fuel	5,915		6,664
Natural gas	9,123		6,849
	$	21,475	$	19,685

(Thousands of Dollars)	Dec. 31, 2013			Dec. 31, 2012
Property, plant and equipment, net
Electric plant	$	1,913,354		$	1,795,239
Natural gas plant	236,047			224,625
Common and other property	112,886			111,319
CWIP	127,954			62,629
Total property, plant and equipment	2,390,241			2,193,812
Less accumulated depreciation	(947,462		)	(895,576		)
	$	1,442,779		$	1,298,236