Reportable Segments

9 Months Ended

Sep. 30, 2011

Reportable Segments

12: REPORTABLE SEGMENTS

Reportable segments consist of business units defined by the products and services they offer. CMS Energy and Consumers evaluate the performance of each segment based on its contribution to net income available to CMS Energy's common stockholders. The reportable segments for CMS Energy and Consumers are:

CMS Energy:

• electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan;

• gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan;

• enterprises, consisting of various subsidiaries engaging primarily in domestic independent power production; and

• other, including EnerBank, corporate interest and other expenses, and discontinued operations.

Consumers:

• electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan;

• gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan; and

• other, including a consolidated special-purpose entity for the sale of accounts receivable.

Presented in the following tables is financial information by reportable segment:

In Millions
	Three Months Ended						Nine Months Ended
September 30	2011			2010			2011			2010
Operating Revenue
CMS Energy, including Consumers
Electric utility	$	1,180		$	1,154		$	3,026		$	2,967
Gas utility		217			216			1,662			1,569
Enterprises		56			63			161			186
Other		11			10			34			28
Total Operating Revenue — CMS Energy	$	1,464		$	1,443		$	4,883		$	4,750
Consumers
Electric utility	$	1,180		$	1,154		$	3,026		$	2,967
Gas utility		217			216			1,662			1,569
Total Operating Revenue — Consumers	$	1,397		$	1,370		$	4,688		$	4,536
Net Income Available to Common Stockholders
CMS Energy, including Consumers
Electric utility	$	159		$	156		$	309		$	283
Gas utility		(5	)		2			88			69
Enterprises		4			9			36			51
Discontinued operations		—			—			2			(17	)
Other		(19	)		(33	)		(61	)		(87	)
Total Net Income Available to Common Stockholders — CMS Energy	$	139		$	134		$	374		$	299
Consumers
Electric utility	$	159		$	156		$	309		$	283
Gas utility		(5	)		2			88			69
Other		—			1			1			1
Total Net Income Available to Common Stockholder — Consumers	$	154		$	159		$	398		$	353

In Millions
	September 30, 2011		December 31, 2010
Plant, Property, and Equipment, Gross
CMS Energy, including Consumers
Electric utility1	$	10,311	$	9,944
Gas utility1		4,149		4,063
Enterprises		109		102
Other		38		36
Total Plant, Property, and Equipment, Gross — CMS Energy	$	14,607	$	14,145
Consumers
Electric utility1	$	10,311	$	9,944
Gas utility1		4,149		4,063
Other		15		15
Total Plant, Property, and Equipment, Gross — Consumers	$	14,475	$	14,022
Assets
CMS Energy, including Consumers
Electric utility1	$	9,607	$	9,321
Gas utility1		4,852		4,614
Enterprises		170		191
Other		1,329		1,490
Total Assets — CMS Energy	$	15,958	$	15,616
Consumers
Electric utility1	$	9,607	$	9,321
Gas utility1		4,852		4,614
Other		599		904
Total Assets — Consumers	$	15,058	$	14,839

¹ Amounts include a portion of Consumers' other common assets attributable to both the electric and the gas utility businesses.

Consumers Energy Company [Member]

Reportable Segments

12: REPORTABLE SEGMENTS

Reportable segments consist of business units defined by the products and services they offer. CMS Energy and Consumers evaluate the performance of each segment based on its contribution to net income available to CMS Energy's common stockholders. The reportable segments for CMS Energy and Consumers are:

CMS Energy:

• electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan;

• gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan;

• enterprises, consisting of various subsidiaries engaging primarily in domestic independent power production; and

• other, including EnerBank, corporate interest and other expenses, and discontinued operations.

Consumers:

• electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan;

• gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan; and

• other, including a consolidated special-purpose entity for the sale of accounts receivable.

Presented in the following tables is financial information by reportable segment:

In Millions
	Three Months Ended						Nine Months Ended
September 30	2011			2010			2011			2010
Operating Revenue
CMS Energy, including Consumers
Electric utility	$	1,180		$	1,154		$	3,026		$	2,967
Gas utility		217			216			1,662			1,569
Enterprises		56			63			161			186
Other		11			10			34			28
Total Operating Revenue — CMS Energy	$	1,464		$	1,443		$	4,883		$	4,750
Consumers
Electric utility	$	1,180		$	1,154		$	3,026		$	2,967
Gas utility		217			216			1,662			1,569
Total Operating Revenue — Consumers	$	1,397		$	1,370		$	4,688		$	4,536
Net Income Available to Common Stockholders
CMS Energy, including Consumers
Electric utility	$	159		$	156		$	309		$	283
Gas utility		(5	)		2			88			69
Enterprises		4			9			36			51
Discontinued operations		—			—			2			(17	)
Other		(19	)		(33	)		(61	)		(87	)
Total Net Income Available to Common Stockholders — CMS Energy	$	139		$	134		$	374		$	299
Consumers
Electric utility	$	159		$	156		$	309		$	283
Gas utility		(5	)		2			88			69
Other		—			1			1			1
Total Net Income Available to Common Stockholder — Consumers	$	154		$	159		$	398		$	353

In Millions
	September 30, 2011		December 31, 2010
Plant, Property, and Equipment, Gross
CMS Energy, including Consumers
Electric utility1	$	10,311	$	9,944
Gas utility1		4,149		4,063
Enterprises		109		102
Other		38		36
Total Plant, Property, and Equipment, Gross — CMS Energy	$	14,607	$	14,145
Consumers
Electric utility1	$	10,311	$	9,944
Gas utility1		4,149		4,063
Other		15		15
Total Plant, Property, and Equipment, Gross — Consumers	$	14,475	$	14,022
Assets
CMS Energy, including Consumers
Electric utility1	$	9,607	$	9,321
Gas utility1		4,852		4,614
Enterprises		170		191
Other		1,329		1,490
Total Assets — CMS Energy	$	15,958	$	15,616
Consumers
Electric utility1	$	9,607	$	9,321
Gas utility1		4,852		4,614
Other		599		904
Total Assets — Consumers	$	15,058	$	14,839

¹ Amounts include a portion of Consumers' other common assets attributable to both the electric and the gas utility businesses.