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Plant, Property, and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2011
Property, Plant and Equipment Table |
In Millions |
Years Ended December 31 |  | Estimated Depreciable Life in Years |  |  | 2011 |  |  | 2010 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 18 – 85 |  |  |  | $ 3,936 |  |  |  | $ 3,812 |
Distribution |  |  | 12 – 75 |  |  |  | 5,538 |  |  |  | 5,250 |
Other |  |  | 7– 40 |  |  |  | 651 |  |  |  | 609 |
Capital and finance leases |  |  |  |  |  |  | 275 |  |  |  | 273 |
Gas |  |  |  |  |  |  |  |  |  |  |  |
Underground storage facilities 1 |  |  | 30– 65 |  |  |  | 322 |  |  |  | 311 |
Transmission |  |  | 13– 75 |  |  |  | 722 |  |  |  | 713 |
Distribution |  |  | 30– 80 |  |  |  | 2,754 |  |  |  | 2,654 |
Other |  |  | 5– 50 |  |  |  | 403 |  |  |  | 380 |
Capital leases |  |  |  |  |  |  | 5 |  |  |  | 5 |
Enterprises |  |  |  |  |  |  |  |  |  |  |  |
Independent power production |  |  | 3– 30 |  |  |  | 89 |  |  |  | 85 |
Other |  |  | 3– 40 |  |  |  | 20 |  |  |  | 17 |
Other |  |  | 1– 51 |  |  |  | 36 |  |  |  | 36 |
Construction work in progress |  |  |  |  |  |  | 783 |  |  |  | 570 |
Less accumulated depreciation and amortization |  |  |  |  |  |  | 4,901 |  |  |  | 4,646 |
Net plant, property, and equipment 2 |  |  |  |  |  |  | $ 10,633 |  |  |  | $ 10,069 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 18 – 85 |  |  |  | $ 3,936 |  |  |  | $3,812 |
Distribution |  |  | 12 – 75 |  |  |  | 5,538 |  |  |  | 5,250 |
Other |  |  | 7 – 40 |  |  |  | 651 |  |  |  | 609 |
Capital and finance leases |  |  |  |  |  |  | 275 |  |  |  | 273 |
Gas |  |  |  |  |  |  |  |  |  |  |  |
Underground storage facilities 1 |  |  | 30 – 65 |  |  |  | 322 |  |  |  | 311 |
Transmission |  |  | 13 – 75 |  |  |  | 722 |  |  |  | 713 |
Distribution |  |  | 30 – 80 |  |  |  | 2,754 |  |  |  | 2,654 |
Other |  |  | 5 – 50 |  |  |  | 403 |  |  |  | 380 |
Capital leases |  |  |  |  |  |  | 5 |  |  |  | 5 |
Other non-utility property |  |  | 8 – 51 |  |  |  | 15 |  |  |  | 15 |
Construction work in progress |  |  |  |  |  |  | 782 |  |  |  | 566 |
Less accumulated depreciation and amortization |  |  |  |  |  |  | 4,846 |  |  |  | 4,593 |
Net plant, property, and equipment 2 |  |  |  |  |  |  | $ 10,557 |  |  |  | $ 9,995 |
1 | Underground storage includes base natural gas of $26 million at December 31, 2011 and 2010. Base natural gas is not subject to depreciation.
2 | For the year ended December 31, 2011, utility plant additions were $700 million and utility plant retirements were $104 million. For the year ended December 31, 2010, utility plant additions were $783 million and utility plant retirements were $85 million.
Public Utilities Property Plant and Equipment Schedule of Accumulated Depreciation and Amortization Table |
In Millions |
Years Ended December 31 |  | 2011 |  |  | 2010 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |
Utility plant assets |  |  | $ 4,844 |  |  |  | $ 4,592 |
Non-utility plant assets |  |  | 57 |  |  |  | 54 |
CONSUMERS |  |  |  |  |  |  |  |
Utility plant assets |  |  | $ 4,844 |  |  |  | $ 4,592 |
Non-utility plant assets |  |  | 2 |  |  |  | 1 |
Schedule of Finite-Lived Intangible Assets by Major Class Table |
In Millions |
Years Ended December 31 |  |  |  |  | 2011 |  |  | 2010 |
Description |  | Amortization Life in years |  |  | Gross Cost 1 |  |  | Accumulated Amortization |  |  | Gross Cost 1 |  |  | Accumulated Amortization |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Software development |  |  | 3– 15 |  |  |  | $ 361 |  |  |  | $ 142 |  |  |  | $ 323 |  |  |  | $ 125 |
Plant acquisition adjustments |  |  | 40 – 46 |  |  |  | 214 |  |  |  | 22 |  |  |  | 213 |  |  |  | 16 |
Rights of way |  |  | 50 – 75 |  |  |  | 128 |  |  |  | 38 |  |  |  | 140 |  |  |  | 37 |
Leasehold improvements |  |  | various | 2 |  |  | 11 |  |  |  | 9 |  |  |  | 13 |  |  |  | 9 |
Franchises and consents |  |  | 5– 30 |  |  |  | 15 |  |  |  | 7 |  |  |  | 15 |  |  |  | 6 |
Other intangibles |  |  | various |  |  |  | 19 |  |  |  | 14 |  |  |  | 20 |  |  |  | 14 |
Total |  |  |  |  |  |  | $ 748 |  |  |  | $ 232 |  |  |  | $ 724 |  |  |  | $ 207 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software development |  |  | 3 – 15 |  |  |  | $ 360 |  |  |  | $ 141 |  |  |  | $ 323 |  |  |  | $ 125 |
Plant acquisition adjustments |  |  | 40 – 46 |  |  |  | 214 |  |  |  | 22 |  |  |  | 213 |  |  |  | 16 |
Rights of way |  |  | 50 – 75 |  |  |  | 128 |  |  |  | 38 |  |  |  | 140 |  |  |  | 37 |
Leasehold improvements |  |  | various | 2 |  |  | 11 |  |  |  | 9 |  |  |  | 13 |  |  |  | 9 |
Franchises and consents |  |  | 5 – 30 |  |  |  | 15 |  |  |  | 7 |  |  |  | 15 |  |  |  | 6 |
Other intangibles |  |  | various |  |  |  | 18 |  |  |  | 14 |  |  |  | 18 |  |  |  | 14 |
Total |  |  |  |  |  |  | $ 746 |  |  |  | $ 231 |  |  |  | $ 722 |  |  |  | $ 207 |
1 | Net intangible asset additions for Consumers' utility plant were $23 million during 2011 and $25 million during 2010.
2 | Leasehold improvements are amortized over the life of the lease, which may change whenever the lease is renewed or extended.
Schedule of Finite Lived Intangible Assets Amortization Expense Table |
In Millions |
|  | CMS Energy, including Consumers |  |  | Consumers |
Years Ended December 31 |  | Total Amortization Expense |  |  | Software Amortization Expense |  |  | Total Amortization Expense |  |  | Software Amortization Expense |
2011 |  |  | $ 32 |  |  |  | $ 24 |  |  |  | $ 32 |  |  |  | $ 24 |
2010 |  |  | 28 |  |  |  | 19 |  |  |  | 27 |  |  |  | 19 |
2009 |  |  | 30 |  |  |  | 22 |  |  |  | 30 |  |  |  | 22 |
Consumers Energy Company [Member] |
Property, Plant and Equipment Table |
In Millions |
Years Ended December 31 |  | Estimated Depreciable Life in Years |  |  | 2011 |  |  | 2010 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 18 – 85 |  |  |  | $ 3,936 |  |  |  | $ 3,812 |
Distribution |  |  | 12 – 75 |  |  |  | 5,538 |  |  |  | 5,250 |
Other |  |  | 7– 40 |  |  |  | 651 |  |  |  | 609 |
Capital and finance leases |  |  |  |  |  |  | 275 |  |  |  | 273 |
Gas |  |  |  |  |  |  |  |  |  |  |  |
Underground storage facilities 1 |  |  | 30– 65 |  |  |  | 322 |  |  |  | 311 |
Transmission |  |  | 13– 75 |  |  |  | 722 |  |  |  | 713 |
Distribution |  |  | 30– 80 |  |  |  | 2,754 |  |  |  | 2,654 |
Other |  |  | 5– 50 |  |  |  | 403 |  |  |  | 380 |
Capital leases |  |  |  |  |  |  | 5 |  |  |  | 5 |
Enterprises |  |  |  |  |  |  |  |  |  |  |  |
Independent power production |  |  | 3 – 30 |  |  |  | 89 |  |  |  | 85 |
Other |  |  | 3 – 40 |  |  |  | 20 |  |  |  | 17 |
Other |  |  | 1– 51 |  |  |  | 36 |  |  |  | 36 |
Construction work in progress |  |  |  |  |  |  | 783 |  |  |  | 570 |
Less accumulated depreciation and amortization |  |  |  |  |  |  | 4,901 |  |  |  | 4,646 |
Net plant, property, and equipment 2 |  |  |  |  |  |  | $ 10,633 |  |  |  | $ 10,069 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 18– 85 |  |  |  | $ 3,936 |  |  |  | $3,812 |
Distribution |  |  | 12– 75 |  |  |  | 5,538 |  |  |  | 5,250 |
Other |  |  | 7– 40 |  |  |  | 651 |  |  |  | 609 |
Capital and finance leases |  |  |  |  |  |  | 275 |  |  |  | 273 |
Gas |  |  |  |  |  |  |  |  |  |  |  |
Underground storage facilities 1 |  |  | 30– 65 |  |  |  | 322 |  |  |  | 311 |
Transmission |  |  | 13– 75 |  |  |  | 722 |  |  |  | 713 |
Distribution |  |  | 30– 80 |  |  |  | 2,754 |  |  |  | 2,654 |
Other |  |  | 5– 50 |  |  |  | 403 |  |  |  | 380 |
Capital leases |  |  |  |  |  |  | 5 |  |  |  | 5 |
Other non-utility property |  |  | 8– 51 |  |  |  | 15 |  |  |  | 15 |
Construction work in progress |  |  |  |  |  |  | 782 |  |  |  | 566 |
Less accumulated depreciation and amortization |  |  |  |  |  |  | 4,846 |  |  |  | 4,593 |
Net plant, property, and equipment 2 |  |  |  |  |  |  | $ 10,557 |  |  |  | $ 9,995 |
1 | Underground storage includes base natural gas of $26 million at December 31, 2011 and 2010. Base natural gas is not subject to depreciation.
2 | For the year ended December 31, 2011, utility plant additions were $700 million and utility plant retirements were $104 million. For the year ended December 31, 2010, utility plant additions were $783 million and utility plant retirements were $85 million.
Schedule of Capital Leased Asssets Table |
In Millions |
Years Ended December 31 |  | 2011 |  |  | 2010 |
CONSUMERS |  |  |  |  |  |  |  |
Balance at beginning of period |  |  | $ 278 |  |  |  | $ 306 |
Additions |  |  | 4 |  |  |  | 15 |
Net retirements and other adjustments |  |  | (2 | ) |  |  | (43 | )
Balance at end of period |  |  | $ 280 |  |  |  | $ 278 |
Public Utilities Property Plant and Equipment Schedule of Accumulated Depreciation and Amortization Table |
In Millions |
Years Ended December 31 |  | 2011 |  |  | 2010 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |
Utility plant assets |  |  | $ 4,844 |  |  |  | $ 4,592 |
Non-utility plant assets |  |  | 57 |  |  |  | 54 |
CONSUMERS |  |  |  |  |  |  |  |
Utility plant assets |  |  | $ 4,844 |  |  |  | $ 4,592 |
Non-utility plant assets |  |  | 2 |  |  |  | 1 |
Public Utilities Property Plant and Equipment Schedule of Composite Depreciation Rate Table |
Years Ended December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
Electric utility property |  |  | 3.0 | % |  |  | 3.0 | % |  |  | 3.0 | %
Gas utility property |  |  | 2.9 | % |  |  | 2.9 | % |  |  | 2.9 | %
Other property |  |  | 7.4 | % |  |  | 7.4 | % |  |  | 7.6 | %
Public Utilities, Allowance for Funds Used During Construction, Schedule of Composite Rate Table |
Years Ended December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
AFUDC capitalization rate |  |  | 7.6 | % |  |  | 7.6 | % |  |  | 7.6 | %
Schedule of Finite-Lived Intangible Assets by Major Class Table |
In Millions |
Years Ended December 31 |  |  |  |  | 2011 |  |  | 2010 |
Description |  | Amortization Life in years |  |  | Gross Cost 1 |  |  | Accumulated Amortization |  |  | Gross Cost 1 |  |  | Accumulated Amortization |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Software development |  |  | 3 – 15 |  |  |  | $ 361 |  |  |  | $ 142 |  |  |  | $ 323 |  |  |  | $ 125 |
Plant acquisition adjustments |  |  | 40 – 46 |  |  |  | 214 |  |  |  | 22 |  |  |  | 213 |  |  |  | 16 |
Rights of way |  |  | 50 – 75 |  |  |  | 128 |  |  |  | 38 |  |  |  | 140 |  |  |  | 37 |
Leasehold improvements |  |  | various | 2 |  |  | 11 |  |  |  | 9 |  |  |  | 13 |  |  |  | 9 |
Franchises and consents |  |  | 5 – 30 |  |  |  | 15 |  |  |  | 7 |  |  |  | 15 |  |  |  | 6 |
Other intangibles |  |  | various |  |  |  | 19 |  |  |  | 14 |  |  |  | 20 |  |  |  | 14 |
Total |  |  |  |  |  |  | $ 748 |  |  |  | $ 232 |  |  |  | $ 724 |  |  |  | $ 207 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software development |  |  | 3– 15 |  |  |  | $ 360 |  |  |  | $ 141 |  |  |  | $ 323 |  |  |  | $ 125 |
Plant acquisition adjustments |  |  | 40 – 46 |  |  |  | 214 |  |  |  | 22 |  |  |  | 213 |  |  |  | 16 |
Rights of way |  |  | 50– 75 |  |  |  | 128 |  |  |  | 38 |  |  |  | 140 |  |  |  | 37 |
Leasehold improvements |  |  | various | 2 |  |  | 11 |  |  |  | 9 |  |  |  | 13 |  |  |  | 9 |
Franchises and consents |  |  | 5– 30 |  |  |  | 15 |  |  |  | 7 |  |  |  | 15 |  |  |  | 6 |
Other intangibles |  |  | various |  |  |  | 18 |  |  |  | 14 |  |  |  | 18 |  |  |  | 14 |
Total |  |  |  |  |  |  | $ 746 |  |  |  | $ 231 |  |  |  | $ 722 |  |  |  | $ 207 |
1 | Net intangible asset additions for Consumers' utility plant were $23 million during 2011 and $25 million during 2010.
2 | Leasehold improvements are amortized over the life of the lease, which may change whenever the lease is renewed or extended.
Schedule of Finite Lived Intangible Assets Amortization Expense Table |
In Millions |
|  | CMS Energy, including Consumers |  |  | Consumers |
Years Ended December 31 |  | Total Amortization Expense |  |  | Software Amortization Expense |  |  | Total Amortization Expense |  |  | Software Amortization Expense |
2011 |  |  | $ 32 |  |  |  | $ 24 |  |  |  | $ 32 |  |  |  | $ 24 |
2010 |  |  | 28 |  |  |  | 19 |  |  |  | 27 |  |  |  | 19 |
2009 |  |  | 30 |  |  |  | 22 |  |  |  | 30 |  |  |  | 22 |
Jointly Owned Regulated Utility Facilities |
In Millions, Except Ownership Share |
|  | Campbell Unit 3 |  |  | Ludington |  |  | Distribution |
Ownership share |  |  | 93.3 | % |  |  | 51.0 | % |  |  | various |
Utility plant in service |  |  | $ 1,059 |  |  |  | $ 175 |  |  |  | $ 168 |
Accumulated depreciation |  |  | (430 | ) |  |  | (118 | ) |  |  | (46 | )
Construction work-in-progress |  |  | 55 |  |  |  | 43 |  |  |  | 7 |
Net investment |  |  | $ 684 |  |  |  | $ 100 |  |  |  | $ 129 |

X
- Definition Tabular disclosure of useful life and carrying value of long-lived assets that are used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, certain intangible assets, and other types of furniture and equipment, including furniture and fixtures, computer equipment, and software. Also includes disclosures of construction work in progess and accumulated depreciation, depletion, and amortization. + References No definition available. + Details
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- Definition Tabular disclosure of the electric, gas, and other composite depreciation rates for public utility plants in service for each year an income statement is presented. + References No definition available. + Details
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- Definition Tabular disclosure of amortizable intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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