PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Questar Gas' average composite depreciation rates on utility property, plant and equipment are as follows:

Year Ended December 31,	2016	2015	2014
(percent)
Distribution	2.42	2.60	2.71
General and other	3.79	3.49	4.29

Major classes of property, plant and equipment and their respective balances for Questar Gas are as follows:

At December 31,	2016		2015
(millions)
Distribution	$	2,436.7	$	2,186.9
General and other	369.5		320.9
Plant under construction	76.8		62.5
Total property, plant and equipment	$	2,883.0	$	2,570.3