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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2020
Asset Retirement Obligations [Line Items]  
Schedule of Asset Retirement Obligations
Presented below are the categories of assets that CMS Energy and Consumers have legal obligations to remove at the end of their useful lives and for which they have an ARO liability recorded:
Company and ARO DescriptionIn-Service DateLong-Lived Assets
CMS Energy, including Consumers
Closure of coal ash disposal areasvariousGenerating plants coal ash areas
Gas distribution cut, purge, and capvariousGas distribution mains and services
Asbestos abatement1973Electric and gas utility plant
Closure of renewable generation assetsvariousWind and solar generation facilities
Gas wells plug and abandonvariousGas transmission and storage
Consumers
Closure of coal ash disposal areasvariousGenerating plants coal ash areas
Gas distribution cut, purge, and capvariousGas distribution mains and services
Asbestos abatement1973Electric and gas utility plant
Closure of renewable generation assetsvariousWind and solar generation facilities
Gas wells plug and abandonvariousGas transmission and storage
Schedule of Change in Asset Retirement Obligation
Presented in the following tables are the changes in CMS Energy’s and Consumers’ ARO liabilities:
In Millions
Company and ARO DescriptionARO Liability 12/31/2019IncurredSettledAccretionCash Flow RevisionsARO Liability 12/31/2020
CMS Energy, including Consumers
Consumers$474 $46 $(41)$23 $28 $530 
Renewable generation assets19 — — 23 
Total CMS Energy$477 $65 $(41)$24 $28 $553 
Consumers
Coal ash disposal areas$166 $— $(24)$$— $148 
Gas distribution cut, purge, and cap231 (5)13 — 240 
Asbestos abatement34 — — — 36 
Renewable generation assets21 24 — 28 74 
Gas wells plug and abandon22 16 (7)— 32 
Cable under Straits of Mackinac1
— (5)— — — 
Total Consumers$474 $46 $(41)$23 $28 $530 
1    For further details, see Note 4, Contingencies and Commitments—Consumers Electric Utility Contingencies.
In Millions
Company and ARO DescriptionARO Liability 12/31/2018IncurredSettledAccretionCash Flow RevisionsARO Liability 12/31/2019
CMS Energy, including Consumers
Consumers$428 $55 $(37)$21 $$474 
Gas treating plant and gas wells— (1)— — — 
Renewable generation assets— — — — 
Total CMS Energy$432 $55 $(38)$21 $$477 
Consumers
Coal ash disposal areas$179 $— $(27)$$$166 
Gas distribution cut, purge, and cap205 22 (8)12 — 231 
Asbestos abatement33 — (1)— 34 
Renewable generation assets11 10 — — — 21 
Gas wells plug and abandon— 23 (1)— — 22 
Total Consumers$428 $55 $(37)$21 $$474 
Consumers Energy Company  
Asset Retirement Obligations [Line Items]  
Schedule of Asset Retirement Obligations
Presented below are the categories of assets that CMS Energy and Consumers have legal obligations to remove at the end of their useful lives and for which they have an ARO liability recorded:
Company and ARO DescriptionIn-Service DateLong-Lived Assets
CMS Energy, including Consumers
Closure of coal ash disposal areasvariousGenerating plants coal ash areas
Gas distribution cut, purge, and capvariousGas distribution mains and services
Asbestos abatement1973Electric and gas utility plant
Closure of renewable generation assetsvariousWind and solar generation facilities
Gas wells plug and abandonvariousGas transmission and storage
Consumers
Closure of coal ash disposal areasvariousGenerating plants coal ash areas
Gas distribution cut, purge, and capvariousGas distribution mains and services
Asbestos abatement1973Electric and gas utility plant
Closure of renewable generation assetsvariousWind and solar generation facilities
Gas wells plug and abandonvariousGas transmission and storage
Schedule of Change in Asset Retirement Obligation
Presented in the following tables are the changes in CMS Energy’s and Consumers’ ARO liabilities:
In Millions
Company and ARO DescriptionARO Liability 12/31/2019IncurredSettledAccretionCash Flow RevisionsARO Liability 12/31/2020
CMS Energy, including Consumers
Consumers$474 $46 $(41)$23 $28 $530 
Renewable generation assets19 — — 23 
Total CMS Energy$477 $65 $(41)$24 $28 $553 
Consumers
Coal ash disposal areas$166 $— $(24)$$— $148 
Gas distribution cut, purge, and cap231 (5)13 — 240 
Asbestos abatement34 — — — 36 
Renewable generation assets21 24 — 28 74 
Gas wells plug and abandon22 16 (7)— 32 
Cable under Straits of Mackinac1
— (5)— — — 
Total Consumers$474 $46 $(41)$23 $28 $530 
1    For further details, see Note 4, Contingencies and Commitments—Consumers Electric Utility Contingencies.
In Millions
Company and ARO DescriptionARO Liability 12/31/2018IncurredSettledAccretionCash Flow RevisionsARO Liability 12/31/2019
CMS Energy, including Consumers
Consumers$428 $55 $(37)$21 $$474 
Gas treating plant and gas wells— (1)— — — 
Renewable generation assets— — — — 
Total CMS Energy$432 $55 $(38)$21 $$477 
Consumers
Coal ash disposal areas$179 $— $(27)$$$166 
Gas distribution cut, purge, and cap205 22 (8)12 — 231 
Asbestos abatement33 — (1)— 34 
Renewable generation assets11 10 — — — 21 
Gas wells plug and abandon— 23 (1)— — 22 
Total Consumers$428 $55 $(37)$21 $$474