Property, Plant and Equipment

12 Months Ended

Dec. 31, 2015

Public Utilities, Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Text Block]

10. PROPERTY, PLANT, AND EQUIPMENT

The following table sets forth the major classifications of our property, plant, and equipment and accumulated depreciation at December 31:

In thousands	2015		2014
Utility plant in service	$	2,745,485	$	2,661,097
Utility construction work in progress	39,288		24,886
Less: Accumulated depreciation	867,377		836,510
Utility plant, net	1,917,396		1,849,473
Non-utility plant in service	296,839		297,295
Non-utility construction work in progress	7,768		9,282
Less: Accumulated depreciation	39,340		34,457
Non-utility plant, net	265,267		272,120
Total property, plant, and equipment	$	2,182,663	$	2,121,593
Capital expenditures in accrued liabilities	$	8,985	$	8,757

The weighted average depreciation rate was 2.8% for utility assets and 2.2% for non-utility assets in 2015, 2014, and 2013.

Accumulated depreciation does not include the accumulated provision for asset removal costs of $327.0 million and $311.2 million at December 31, 2015 and 2014, respectively. These accrued asset removal costs are reflected on the balance sheet as regulatory liabilities. See Note 2. During 2014, we acquired $1.3 million of equipment under capital leases. In 2015, we did not acquire any equipment under capital leases.