INVESTMENT IN ATC (Tables) (ATC)

3 Months Ended

Mar. 31, 2013

ATC

Schedule of Equity Method Investments

Schedule of changes to Integrys Energy Group's investment in ATC

	Three Months Ended March 31
(Millions)	2013		2012
Balance at the beginning of period	$	476.6	$	439.4
Add: Earnings from equity method investment	21.7		20.8
Add: Capital contributions	1.7		3.4
Less: Dividends received	17.3		16.7
Balance at the end of period	$	482.7	$	446.9

Summarized income statement information of ATC

	Three Months Ended March 31
(Millions)	2013		2012
Income statement data
Revenues	$	151.8	$	147.7
Operating expenses	69.8		69.6
Other expense	21.5		20.0
Net income	$	60.5	$	58.1

Summarized balance sheet information of ATC

(Millions)	March 31, 2013		December 31, 2012
Balance sheet data
Current assets	$	69.3	$	63.1
Noncurrent assets	3,325.3		3,274.7
Total assets	$	3,394.6	$	3,337.8
Current liabilities	$	261.5	$	251.5
Long-term debt	1,550.0		1,550.0
Other noncurrent liabilities	124.8		95.8
Shareholders’ equity	1,458.3		1,440.5
Total liabilities and shareholders’ equity	$	3,394.6	$	3,337.8