PROPERTY, PLANT, AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Schedule of property, plant, and equipment

Property, plant, and equipment consisted of the following utility and nonutility assets at December 31:

(Millions)	2014		2013
Electric utility	$	3,587.4	$	3,289.2
Natural gas utility	773.1		729.9
Total utility plant	4,360.5		4,019.1
Less: Accumulated depreciation	1,495.9		1,436.8
Net	2,864.6		2,582.3
Construction work in progress	248.7		285.2
Plant to be retired, net *	12.5		14.4
Net utility plant	3,125.8		2,881.9
Nonutility plant	15.2		15.2
Less: Accumulated depreciation	10.0		9.4
Net nonutility plant	5.2		5.8
Total property, plant, and equipment	$	3,131.0	$	2,887.7

* In connection with the Consent Decree with the EPA, we announced that the Weston 1, Pulliam 5, and Pulliam 6 generating units will be retired early. These units are currently included in rate base and we continue to depreciate them on a straight-line basis using the composite depreciation rates approved by the PSCW. The amount presented above is net of accumulated depreciation. See Note 15, Commitments and Contingencies, for more information regarding the Consent Decree.