Utility & Nonutility Plant (Tables)

12 Months Ended

Dec. 31, 2011

The original cost of Utility Plant, together with depreciation rates expressed as a percentage of original cost, follows:


	At December 31,
(In millions)	2011					2010
	Original Cost		Depreciation Rates as a Percent of Original Cost			Original Cost		Depreciation Rates as a Percent of Original Cost
Gas utility plant	$	2,516.8		3.5	%	$	2,410.2		3.6	%
Electric utility plant		2,316.8		3.3	%		2,258.6		3.4	%
Common utility plant		51.6		2.9	%		49.7		3.1	%
Construction work in progress		94.7		-			73.2		-
Total original cost	$	4,979.9				$	4,791.7

Nonutility plant, net of accumulated depreciation and amortization follows:


	At December 31,
(In millions)	2011		2010
Coal mine development costs & equipment	$	222.0	$	196.9
Computer hardware & software		101.9		114.5
Land & buildings		112.0		112.8
Vehicles & equipment		92.5		46.9
All other		22.4		17.2
Nonutility plant - net	$	550.8	$	488.3