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Quarterly Financial and Common Stock Information (Unaudited) | 12 Months Ended
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Dec. 31, 2011
Quarterly Financial and Common Stock Information (Unaudited) | 22: QUARTERLY FINANCIAL AND COMMON STOCK INFORMATION (UNAUDITED)
|  | In Millions, Except Per Share Amounts and Stock Prices |
|  | 2011 |
Quarters Ended |  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 2,055 |  |  | $ | 1,364 |  |  | $ | 1,464 |  |  | $ | 1,620 |
Operating Income |  |  | 306 |  |  |  | 207 |  |  |  | 316 |  |  |  | 174 |
Income From Continuing Operations |  |  | 133 |  |  |  | 101 |  |  |  | 140 |  |  |  | 41 |
Income From Discontinued Operations |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |
Net Income |  |  | 135 |  |  |  | 101 |  |  |  | 140 |  |  |  | 41 |
Income Attributable to Noncontrolling Interests |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Attributable to CMS Energy |  |  | 135 |  |  |  | 100 |  |  |  | 139 |  |  |  | 41 |
Net income Available to Common Stockholders |  |  | 135 |  |  |  | 100 |  |  |  | 139 |  |  |  | 41 |
Earnings From Continuing Operations Per Average Common Share – Basic 1 |  |  | 0.53 |  |  |  | 0.40 |  |  |  | 0.55 |  |  |  | 0.16 |
Earnings From Continuing Operations Per Average Common Share – Diluted 1 |  |  | 0.51 |  |  |  | 0.38 |  |  |  | 0.53 |  |  |  | 0.15 |
Basic Earnings Per Average Common Share 1 |  |  | 0.54 |  |  |  | 0.40 |  |  |  | 0.55 |  |  |  | 0.16 |
Diluted Earnings Per Average Common Share 1 |  |  | 0.52 |  |  |  | 0.38 |  |  |  | 0.53 |  |  |  | 0.15 |
Common stock prices 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  | 19.78 |  |  |  | 20.39 |  |  |  | 20.47 |  |  |  | 22.35 |
Low |  |  | 18.60 |  |  |  | 18.90 |  |  |  | 17.16 |  |  |  | 19.18 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,988 |  |  | $ | 1,303 |  |  | $ | 1,397 |  |  | $ | 1,565 |
Operating Income |  |  | 300 |  |  |  | 207 |  |  |  | 305 |  |  |  | 173 |
Net Income |  |  | 153 |  |  |  | 92 |  |  |  | 155 |  |  |  | 67 |
Preferred Stock Dividends |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Available to Common Stockholder |  |  | 153 |  |  |  | 91 |  |  |  | 154 |  |  |  | 67 |
|  | In Millions, Except Per Share Amounts and Stock Prices |
|  | 2010 |
Quarters Ended |  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,967 |  |  | $ | 1,340 |  |  | $ | 1,443 |  |  | $ | 1,682 |
Operating Income |  |  | 239 |  |  |  | 262 |  |  |  | 319 |  |  |  | 158 |
Income From Continuing Operations |  |  | 89 |  |  |  | 100 |  |  |  | 146 |  |  |  | 31 |
Loss From Discontinued Operations |  |  | (1 | ) |  |  | (16 | ) |  |  | - |  |  |  | (6) |
Net Income |  |  | 88 |  |  |  | 84 |  |  |  | 146 |  |  |  | 25 |
Income Attributable to Noncontrolling Interests |  |  | - |  |  |  | 2 |  |  |  | 1 |  |  |  | - |
Net Income Attributable to CMS Energy |  |  | 88 |  |  |  | 82 |  |  |  | 145 |  |  |  | 25 |
Charge for Deferred Issuance Cost on Preferred Stock |  |  | - |  |  |  | - |  |  |  | 8 |  |  |  | - |
Preferred Stock Dividends |  |  | 3 |  |  |  | 2 |  |  |  | 3 |  |  |  | - |
Net Income Available to Common Stockholders |  |  | 85 |  |  |  | 80 |  |  |  | 134 |  |  |  | 25 |
Earnings From Continuing Operations Per Average Common Share – Basic 1 |  |  | 0.38 |  |  |  | 0.42 |  |  |  | 0.58 |  |  |  | 0.13 |
Earnings From Continuing Operations Per Average Common Share – Diluted 1 |  |  | 0.35 |  |  |  | 0.39 |  |  |  | 0.53 |  |  |  | 0.11 |
Basic Earnings Per Average Common Share 1 |  |  | 0.37 |  |  |  | 0.35 |  |  |  | 0.58 |  |  |  | 0.11 |
Diluted Earnings Per Average Common Share 1 |  |  | 0.34 |  |  |  | 0.32 |  |  |  | 0.53 |  |  |  | 0.09 |
Common stock prices 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  | 15.90 |  |  |  | 16.55 |  |  |  | 18.15 |  |  |  | 19.16 |
Low |  |  | 14.57 |  |  |  | 14.26 |  |  |  | 14.68 |  |  |  | 17.72 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,890 |  |  | $ | 1,276 |  |  | $ | 1,370 |  |  | $ | 1,620 |
Operating Income |  |  | 224 |  |  |  | 207 |  |  |  | 304 |  |  |  | 191 |
Net Income |  |  | 107 |  |  |  | 88 |  |  |  | 160 |  |  |  | 79 |
Preferred Stock Dividends |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Available to Common Stockholder |  |  | 107 |  |  |  | 87 |  |  |  | 159 |  |  |  | 79 |
1 The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding. 2 Based on New York Stock Exchange composite transactions.
Consumers Energy Company [Member] |
Quarterly Financial and Common Stock Information (Unaudited) | 22: QUARTERLY FINANCIAL AND COMMON STOCK INFORMATION (UNAUDITED)
|  | In Millions, Except Per Share Amounts and Stock Prices |
|  | 2011 |
Quarters Ended |  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 2,055 |  |  | $ | 1,364 |  |  | $ | 1,464 |  |  | $ | 1,620 |
Operating Income |  |  | 306 |  |  |  | 207 |  |  |  | 316 |  |  |  | 174 |
Income From Continuing Operations |  |  | 133 |  |  |  | 101 |  |  |  | 140 |  |  |  | 41 |
Income From Discontinued Operations |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |
Net Income |  |  | 135 |  |  |  | 101 |  |  |  | 140 |  |  |  | 41 |
Income Attributable to Noncontrolling Interests |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Attributable to CMS Energy |  |  | 135 |  |  |  | 100 |  |  |  | 139 |  |  |  | 41 |
Net income Available to Common Stockholders |  |  | 135 |  |  |  | 100 |  |  |  | 139 |  |  |  | 41 |
Earnings From Continuing Operations Per Average Common Share – Basic 1 |  |  | 0.53 |  |  |  | 0.40 |  |  |  | 0.55 |  |  |  | 0.16 |
Earnings From Continuing Operations Per Average Common Share – Diluted 1 |  |  | 0.51 |  |  |  | 0.38 |  |  |  | 0.53 |  |  |  | 0.15 |
Basic Earnings Per Average Common Share 1 |  |  | 0.54 |  |  |  | 0.40 |  |  |  | 0.55 |  |  |  | 0.16 |
Diluted Earnings Per Average Common Share 1 |  |  | 0.52 |  |  |  | 0.38 |  |  |  | 0.53 |  |  |  | 0.15 |
Common stock prices 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  | 19.78 |  |  |  | 20.39 |  |  |  | 20.47 |  |  |  | 22.35 |
Low |  |  | 18.60 |  |  |  | 18.90 |  |  |  | 17.16 |  |  |  | 19.18 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,988 |  |  | $ | 1,303 |  |  | $ | 1,397 |  |  | $ | 1,565 |
Operating Income |  |  | 300 |  |  |  | 207 |  |  |  | 305 |  |  |  | 173 |
Net Income |  |  | 153 |  |  |  | 92 |  |  |  | 155 |  |  |  | 67 |
Preferred Stock Dividends |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Available to Common Stockholder |  |  | 153 |  |  |  | 91 |  |  |  | 154 |  |  |  | 67 |
|  | In Millions, Except Per Share Amounts and Stock Prices |
|  | 2010 |
Quarters Ended |  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,967 |  |  | $ | 1,340 |  |  | $ | 1,443 |  |  | $ | 1,682 |
Operating Income |  |  | 239 |  |  |  | 262 |  |  |  | 319 |  |  |  | 158 |
Income From Continuing Operations |  |  | 89 |  |  |  | 100 |  |  |  | 146 |  |  |  | 31 |
Loss From Discontinued Operations |  |  | (1 | ) |  |  | (16 | ) |  |  | - |  |  |  | (6) |
Net Income |  |  | 88 |  |  |  | 84 |  |  |  | 146 |  |  |  | 25 |
Income Attributable to Noncontrolling Interests |  |  | - |  |  |  | 2 |  |  |  | 1 |  |  |  | - |
Net Income Attributable to CMS Energy |  |  | 88 |  |  |  | 82 |  |  |  | 145 |  |  |  | 25 |
Charge for Deferred Issuance Cost on Preferred Stock |  |  | - |  |  |  | - |  |  |  | 8 |  |  |  | - |
Preferred Stock Dividends |  |  | 3 |  |  |  | 2 |  |  |  | 3 |  |  |  | - |
Net Income Available to Common Stockholders |  |  | 85 |  |  |  | 80 |  |  |  | 134 |  |  |  | 25 |
Earnings From Continuing Operations Per Average Common Share – Basic 1 |  |  | 0.38 |  |  |  | 0.42 |  |  |  | 0.58 |  |  |  | 0.13 |
Earnings From Continuing Operations Per Average Common Share – Diluted 1 |  |  | 0.35 |  |  |  | 0.39 |  |  |  | 0.53 |  |  |  | 0.11 |
Basic Earnings Per Average Common Share 1 |  |  | 0.37 |  |  |  | 0.35 |  |  |  | 0.58 |  |  |  | 0.11 |
Diluted Earnings Per Average Common Share 1 |  |  | 0.34 |  |  |  | 0.32 |  |  |  | 0.53 |  |  |  | 0.09 |
Common stock prices 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  | 15.90 |  |  |  | 16.55 |  |  |  | 18.15 |  |  |  | 19.16 |
Low |  |  | 14.57 |  |  |  | 14.26 |  |  |  | 14.68 |  |  |  | 17.72 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,890 |  |  | $ | 1,276 |  |  | $ | 1,370 |  |  | $ | 1,620 |
Operating Income |  |  | 224 |  |  |  | 207 |  |  |  | 304 |  |  |  | 191 |
Net Income |  |  | 107 |  |  |  | 88 |  |  |  | 160 |  |  |  | 79 |
Preferred Stock Dividends |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Available to Common Stockholder |  |  | 107 |  |  |  | 87 |  |  |  | 159 |  |  |  | 79 |
1 The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding. 2 Based on New York Stock Exchange composite transactions.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 23, 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 30 -Subparagraph a-j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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