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Plant, Property, and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2014
Schedule Of Property, Plant And Equipment |
In Millions
December 31 | Estimated Depreciable Life in Years | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |
Generation | 22 | - | 125 |  | $ | 4,544 |  | $ | 3,992 |
Distribution | 23 | - | 75 |  |  | 6,487 |  |  | 6,140 |
Other | 5 | - | 50 |  |  | 910 |  |  | 770 |
Assets under capital leases and other arrangements |  |  |  |  |  | 289 |  |  | 284 |
Gas |  |  |  |  |  |  |  |  |  |
Distribution | 28 | - | 80 |  |  | 3,239 |  |  | 3,015 |
Transmission | 17 | - | 75 |  |  | 974 |  |  | 821 |
Underground storage facilities 1 | 29 | - | 65 |  |  | 578 |  |  | 535 |
Other | 5 | - | 50 |  |  | 538 |  |  | 465 |
Capital leases |  |  |  |  |  | 6 |  |  | 7 |
Enterprises |  |  |  |  |  |  |  |  |  |
Independent power production | 3 | - | 30 |  |  | 90 |  |  | 89 |
Other | 3 | - | 40 |  |  | 25 |  |  | 26 |
Other | 1 | - | 51 |  |  | 41 |  |  | 40 |
Construction work in progress |  |  |  |  |  | 1,106 |  |  | 1,149 |
Less accumulated depreciation and amortization |  |  |  |  |  | (5,415) |  |  | (5,087) |
Net plant, property, and equipment 2 |  |  |  |  | $ | 13,412 |  | $ | 12,246 |
Consumers |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |
Generation | 22 | - | 125 |  | $ | 4,544 |  | $ | 3,992 |
Distribution | 23 | - | 75 |  |  | 6,487 |  |  | 6,140 |
Other | 5 | - | 50 |  |  | 910 |  |  | 770 |
Assets under capital leases and other arrangements |  |  |  |  |  | 289 |  |  | 284 |
Gas |  |  |  |  |  |  |  |  |  |
Distribution | 28 | - | 80 |  |  | 3,239 |  |  | 3,015 |
Transmission | 17 | - | 75 |  |  | 974 |  |  | 821 |
Underground storage facilities 1 | 29 | - | 65 |  |  | 578 |  |  | 535 |
Other | 5 | - | 50 |  |  | 538 |  |  | 465 |
Capital leases |  |  |  |  |  | 6 |  |  | 7 |
Other non-utility property | 8 | - | 51 |  |  | 15 |  |  | 15 |
Construction work in progress |  |  |  |  |  | 1,103 |  |  | 1,147 |
Less accumulated depreciation and amortization |  |  |  |  |  | (5,346) |  |  | (5,022) |
Net plant, property, and equipment 2 |  |  |  |  | $ | 13,337 |  | $ | 12,169 |
| 1 |  | Underground storage includes base natural gas of $26 million at December 31, 2014 and 2013. Base natural gas is not subject to depreciation.
| 2 |  | For the year ended December 31, 2014, utility plant additions were $1.6 billion and utility plant retirements were $126 million. For the year ended December 31, 2013, utility plant additions were $1.3 billion and utility plant retirements were $156 million.
Public Utilities Property Plant and Equipment Schedule of Accumulated Depreciation and Amortization Table |
In Millions
December 31 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |
Utility plant assets |  | $ | 5,345 |  | $ | 5,021 |
Non-utility plant assets |  |  | 70 |  |  | 66 |
Consumers |  |  |  |  |  |  |
Utility plant assets |  | $ | 5,345 |  | $ | 5,021 |
Non-utility plant assets |  |  | 1 |  |  | 1 |
Schedule of Finite-Lived Intangible Assets by Major Class Table |
In Millions
December 31 |  |  | 2014 |  | 2013 |
Description | Amortization Life in Years |  | Gross Cost 1 | Accumulated Amortization |  | Gross Cost 1 | Accumulated Amortization |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software development |  | 3 | - | 15 |  |  | $ | 596 |  | $ | 223 |  |  | $ | 508 |  | $ | 174 |
Plant acquisition adjustments |  | 15 | - | 46 |  |  |  | 217 |  |  | 38 |  |  |  | 216 |  |  | 32 |
Rights of way |  | 50 | - | 75 |  |  |  | 150 |  |  | 44 |  |  |  | 135 |  |  | 42 |
Leasehold improvements |  | various 2 |  |  |  | 5 |  |  | 4 |  |  |  | 14 |  |  | 11 |
Franchises and consents |  | 5 | - | 30 |  |  |  | 15 |  |  | 8 |  |  |  | 15 |  |  | 7 |
Other intangibles |  | various |  |  |  | 21 |  |  | 14 |  |  |  | 21 |  |  | 14 |
Total |  |  |  |  |  |  | $ | 1,004 |  | $ | 331 |  |  | $ | 909 |  | $ | 280 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software development |  | 3 | - | 15 |  |  | $ | 594 |  | $ | 221 |  |  | $ | 506 |  | $ | 173 |
Plant acquisition adjustments |  | 15 | - | 46 |  |  |  | 217 |  |  | 38 |  |  |  | 216 |  |  | 32 |
Rights of way |  | 50 | - | 75 |  |  |  | 150 |  |  | 44 |  |  |  | 135 |  |  | 42 |
Leasehold improvements |  | various 2 |  |  |  | 5 |  |  | 4 |  |  |  | 14 |  |  | 11 |
Franchises and consents |  | 5 | - | 30 |  |  |  | 15 |  |  | 8 |  |  |  | 15 |  |  | 7 |
Other intangibles |  | various |  |  |  | 21 |  |  | 14 |  |  |  | 20 |  |  | 14 |
Total |  |  |  |  |  |  | $ | 1,002 |  | $ | 329 |  |  | $ | 906 |  | $ | 279 |
| 1 |  | Net intangible asset additions for Consumers’ utility plant were $96 million during 2014 and $53 million during 2013 and primarily represented software development costs.
| 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 |
2014 |  | $ | 59 |  | $ | 50 |  |  | $ | 58 |  | $ | 49 |
2013 |  |  | 48 |  |  | 39 |  |  |  | 47 |  |  | 39 |
2012 |  |  | 39 |  |  | 31 |  |  |  | 38 |  |  | 30 |
Jointly Owned Regulated Utility Facilities |
In Millions, Except Ownership Share
| J.H. Campbell Unit 3 |  | Ludington |  | Distribution |
Ownership share |  |  | 93.3 | % |  |  | 51.0 | % |  |  | various |
Utility plant in service |  | $ | 1,077 |  |  | $ | 194 |  |  | $ | 194 |
Accumulated depreciation |  |  | (503) |  |  |  | (156) |  |  |  | (63) |
Construction work-in-progress |  |  | 358 |  |  |  | 175 |  |  |  | 2 |
Net investment |  | $ | 932 |  |  | $ | 213 |  |  | $ | 133 |
Consumers Energy Company [Member] |
Schedule Of Property, Plant And Equipment |
In Millions
December 31 | Estimated Depreciable Life in Years | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |
Generation | 22 | - | 125 |  | $ | 4,544 |  | $ | 3,992 |
Distribution | 23 | - | 75 |  |  | 6,487 |  |  | 6,140 |
Other | 5 | - | 50 |  |  | 910 |  |  | 770 |
Assets under capital leases and other arrangements |  |  |  |  |  | 289 |  |  | 284 |
Gas |  |  |  |  |  |  |  |  |  |
Distribution | 28 | - | 80 |  |  | 3,239 |  |  | 3,015 |
Transmission | 17 | - | 75 |  |  | 974 |  |  | 821 |
Underground storage facilities 1 | 29 | - | 65 |  |  | 578 |  |  | 535 |
Other | 5 | - | 50 |  |  | 538 |  |  | 465 |
Capital leases |  |  |  |  |  | 6 |  |  | 7 |
Enterprises |  |  |  |  |  |  |  |  |  |
Independent power production | 3 | - | 30 |  |  | 90 |  |  | 89 |
Other | 3 | - | 40 |  |  | 25 |  |  | 26 |
Other | 1 | - | 51 |  |  | 41 |  |  | 40 |
Construction work in progress |  |  |  |  |  | 1,106 |  |  | 1,149 |
Less accumulated depreciation and amortization |  |  |  |  |  | (5,415) |  |  | (5,087) |
Net plant, property, and equipment 2 |  |  |  |  | $ | 13,412 |  | $ | 12,246 |
Consumers |  |  |  |  |  |  |  |  |  |
Electric |  |  |  |  |  |  |  |  |  |
Generation | 22 | - | 125 |  | $ | 4,544 |  | $ | 3,992 |
Distribution | 23 | - | 75 |  |  | 6,487 |  |  | 6,140 |
Other | 5 | - | 50 |  |  | 910 |  |  | 770 |
Assets under capital leases and other arrangements |  |  |  |  |  | 289 |  |  | 284 |
Gas |  |  |  |  |  |  |  |  |  |
Distribution | 28 | - | 80 |  |  | 3,239 |  |  | 3,015 |
Transmission | 17 | - | 75 |  |  | 974 |  |  | 821 |
Underground storage facilities 1 | 29 | - | 65 |  |  | 578 |  |  | 535 |
Other | 5 | - | 50 |  |  | 538 |  |  | 465 |
Capital leases |  |  |  |  |  | 6 |  |  | 7 |
Other non-utility property | 8 | - | 51 |  |  | 15 |  |  | 15 |
Construction work in progress |  |  |  |  |  | 1,103 |  |  | 1,147 |
Less accumulated depreciation and amortization |  |  |  |  |  | (5,346) |  |  | (5,022) |
Net plant, property, and equipment 2 |  |  |  |  | $ | 13,337 |  | $ | 12,169 |
| 1 |  | Underground storage includes base natural gas of $26 million at December 31, 2014 and 2013. Base natural gas is not subject to depreciation.
| 2 |  | For the year ended December 31, 2014, utility plant additions were $1.6 billion and utility plant retirements were $126 million. For the year ended December 31, 2013, utility plant additions were $1.3 billion and utility plant retirements were $156 million.
Schedule of Capital Leased Asssets Table |
In Millions
Years Ended December 31 | 2014 | 2013 |
Consumers |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 291 |  | $ | 285 |
Additions |  |  | 7 |  |  | 12 |
Net retirements and other adjustments |  |  | (3) |  |  | (6) |
Balance at end of period |  | $ | 295 |  | $ | 291 |
Public Utilities Property Plant and Equipment Schedule of Accumulated Depreciation and Amortization Table |
In Millions
December 31 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |
Utility plant assets |  | $ | 5,345 |  | $ | 5,021 |
Non-utility plant assets |  |  | 70 |  |  | 66 |
Consumers |  |  |  |  |  |  |
Utility plant assets |  | $ | 5,345 |  | $ | 5,021 |
Non-utility plant assets |  |  | 1 |  |  | 1 |
Public Utilities Property Plant and Equipment Schedule of Composite Depreciation Rate Table |
Years Ended December 31 | 2014 |  | 2013 |  | 2012 |  |
Electric utility property |  | 3.5 | % |  | 3.5 | % |  | 3.2 | % |
Gas utility property |  | 2.8 | % |  | 2.8 | % |  | 2.9 | % |
Other property |  | 7.7 | % |  | 7.0 | % |  | 7.2 | % |
Public Utilities, Allowance for Funds Used During Construction, Schedule of Composite Rate Table |
Years Ended December 31 | 2014 |  | 2013 |  | 2012 |  |
AFUDC capitalization rate |  | 7.2 | % |  | 7.3 | % |  | 7.3 | % |
Schedule of Finite-Lived Intangible Assets by Major Class Table |
In Millions
December 31 |  |  | 2014 |  | 2013 |
Description | Amortization Life in Years |  | Gross Cost 1 | Accumulated Amortization |  | Gross Cost 1 | Accumulated Amortization |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software development |  | 3 | - | 15 |  |  | $ | 596 |  | $ | 223 |  |  | $ | 508 |  | $ | 174 |
Plant acquisition adjustments |  | 15 | - | 46 |  |  |  | 217 |  |  | 38 |  |  |  | 216 |  |  | 32 |
Rights of way |  | 50 | - | 75 |  |  |  | 150 |  |  | 44 |  |  |  | 135 |  |  | 42 |
Leasehold improvements |  | various 2 |  |  |  | 5 |  |  | 4 |  |  |  | 14 |  |  | 11 |
Franchises and consents |  | 5 | - | 30 |  |  |  | 15 |  |  | 8 |  |  |  | 15 |  |  | 7 |
Other intangibles |  | various |  |  |  | 21 |  |  | 14 |  |  |  | 21 |  |  | 14 |
Total |  |  |  |  |  |  | $ | 1,004 |  | $ | 331 |  |  | $ | 909 |  | $ | 280 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software development |  | 3 | - | 15 |  |  | $ | 594 |  | $ | 221 |  |  | $ | 506 |  | $ | 173 |
Plant acquisition adjustments |  | 15 | - | 46 |  |  |  | 217 |  |  | 38 |  |  |  | 216 |  |  | 32 |
Rights of way |  | 50 | - | 75 |  |  |  | 150 |  |  | 44 |  |  |  | 135 |  |  | 42 |
Leasehold improvements |  | various 2 |  |  |  | 5 |  |  | 4 |  |  |  | 14 |  |  | 11 |
Franchises and consents |  | 5 | - | 30 |  |  |  | 15 |  |  | 8 |  |  |  | 15 |  |  | 7 |
Other intangibles |  | various |  |  |  | 21 |  |  | 14 |  |  |  | 20 |  |  | 14 |
Total |  |  |  |  |  |  | $ | 1,002 |  | $ | 329 |  |  | $ | 906 |  | $ | 279 |
| 1 |  | Net intangible asset additions for Consumers’ utility plant were $96 million during 2014 and $53 million during 2013 and primarily represented software development costs.
| 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 |
2014 |  | $ | 59 |  | $ | 50 |  |  | $ | 58 |  | $ | 49 |
2013 |  |  | 48 |  |  | 39 |  |  |  | 47 |  |  | 39 |
2012 |  |  | 39 |  |  | 31 |  |  |  | 38 |  |  | 30 |
Jointly Owned Regulated Utility Facilities |
In Millions, Except Ownership Share
| J.H. Campbell Unit 3 |  | Ludington |  | Distribution |
Ownership share |  |  | 93.3 | % |  |  | 51.0 | % |  |  | various |
Utility plant in service |  | $ | 1,077 |  |  | $ | 194 |  |  | $ | 194 |
Accumulated depreciation |  |  | (503) |  |  |  | (156) |  |  |  | (63) |
Construction work-in-progress |  |  | 358 |  |  |  | 175 |  |  |  | 2 |
Net investment |  | $ | 932 |  |  | $ | 213 |  |  | $ | 133 |

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