Property Plant and Equipment Property Plant and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure

Property, Plant, and Equipment

Major classes of property, plant and equipment:

(Millions of Dollars)	Dec. 31, 2018			Dec. 31, 2017
Property, plant and equipment
Electric plant	$	2,895.5		$	2,602.7
Natural gas plant	345.7			326.7
Common and other property	189.7			181.1
CWIP	55.0			148.8
Total property, plant and equipment	3,485.9			3,259.3
Less accumulated amortization	(1,244.3		)	(1,170.6		)
	$	2,241.6		$	2,088.7

Joint Ownership of Transmission Facilities

Jointly owned assets as of Dec. 31, 2018:

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
Electric Transmission:
La Crosse, Wis. to Madison, Wis.	$	175.4	$	2.2	$	—	37	%
CapX2020 Transmission	168.4		14.5		2.3		81
Total	$	343.8	$	16.7	$	2.3

NSP-Wisconsin’s share of operating expenses and construction expenditures are included in the applicable utility accounts. Respective owners are responsible for providing their own financing.