INVESTMENTS IN AFFILIATES, AT EQUITY METHOD (Tables)

12 Months Ended

Dec. 31, 2011

INVESTMENTS IN AFFILIATES, AT EQUITY METHOD

Schedule of investments in corporate joint ventures and other companies accounted for under the equity method

(Millions)	2011		2010
ATC	$	439.4	$	416.3
INDU Solar Holdings, LLC	28.4		0.1
WRPC	7.7		8.1
Other	0.8		1.0
Investments in affiliates, at equity method	$	476.3	$	425.5

ATC, INDU Solar Holdings LLC, and WRPC

Schedule of Equity Method Investments

Schedule of combined financial data of significant equity method investments, ATC, INDU Solar Holdings, LLC, and WRPC

(Millions)	2011		2010		2009 *
Income statement data
Revenues	$	575.5	$	564.1	$	528.7
Operating expenses	269.6		257.6		235.7
Other expense	81.5		85.7		77.7
Net income	$	224.4	$	220.8	$	215.3
Equity in net income	$	79.4	$	78.2	$	76.3
Balance sheet data
Current assets	$	91.1	$	62.7	$	54.0
Noncurrent assets	3,120.5		2,906.2		2,785.5
Total assets	$	3,211.6	$	2,968.9	$	2,839.5
Current liabilities	$	319.9	$	429.0	$	286.3
Long-term debt	1,400.0		1,175.0		1,259.6
Other noncurrent liabilities	88.0		88.5		80.1
Shareholders’ equity	1,403.7		1,276.4		1,213.5
Total liabilities and shareholders’ equity	$	3,211.6	$	2,968.9	$	2,839.5

* Combined financial data for 2009 does not include INDU Solar Holdings, LLC as it was formed in 2010.

ATC

Schedule of Equity Method Investments

Schedule of changes to Integrys Energy Group's investment

(Millions)	2011		2010		2009
Balance at the beginning of period	$	416.3	$	395.9	$	346.9
Add: Equity in net income	79.1		77.6		75.3
Add: Capital contributions	8.5		6.8		34.1
Less: Dividends received	64.5		64.0		60.4
Balance at the end of period	$	439.4	$	416.3	$	395.9

Schedule of related party transactions with ATC recorded by the regulated electric utilities

(Millions)	2011		2010		2009
Total charges to ATC for services and construction	$	13.5	$	14.0	$	10.1
Total costs for network transmission service provided by ATC	102.7		103.0		90.7

INDU Solar Holdings, LLC

Schedule of Equity Method Investments

Schedule of changes to Integrys Energy Group's investment

(Millions)	2011			2010
Balance at the beginning of period	$	0.1		$	—
Add: Equity in net loss	(0.7		)	(0.4		)
Add: Capital contributions	29.0			0.5
Balance at the end of period	$	28.4		$	0.1

WRPC

Schedule of Equity Method Investments

Schedule of changes to Integrys Energy Group's investment

(Millions)	2011		2010		2009
Balance at the beginning of period	$	8.1	$	8.5	$	8.4
Add: Equity in net income	0.9		1.0		1.0
Less: Dividends received	1.3		1.4		0.9
Balance at the end of period	$	7.7	$	8.1	$	8.5

Schedule of related party transactions recorded by WPS

(Millions)	2011		2010		2009
Revenues from services provided to WRPC	$	0.7	$	0.6	$	0.6
Purchases of energy from WRPC	4.9		4.7		4.6
Net proceeds from WRPC sales of energy to MISO	4.7		4.5		2.6