Regulatory Matters (Tables) - Consumers Energy Company [Member]

12 Months Ended

Dec. 31, 2015

Public Utility, Property, Plant and Equipment [Line Items]

Schedule of Regulatory Assets and Liabilities

In Millions
December 31	End of Recovery  or Refund Period	2015			2014
Regulatory assets
Current
Energy optimization plan incentive1	2016		$	16		$	17
Securitized costs – electric utility restructuring legislation2	2015			-			61
Major maintenance2	2015			-			8
Other	2015			-			3
Total current regulatory assets			$	16		$	89
Non-current
Postretirement benefits3	various		$	1,096		$	1,195
Securitized costs – electric generating units to be retired2	2029			348			370
ARO4	various			151			139
MGP sites4	various			146			147
Unamortized debt costs4	various			61			66
Gas storage inventory adjustments4	various			18			21
Energy optimization plan incentive1	2017			18			17
Other	various			2			1
Total non‑current regulatory assets			$	1,840		$	1,956
Total regulatory assets			$	1,856		$	2,045
Regulatory liabilities
Current
Income taxes, net	2016		$	64		$	64
Securitized costs – electric utility restructuring legislation	2016			14			-
Other	2016			4			3
Total current regulatory liabilities			$	82		$	67
Non-current
Cost of removal	various		$	1,745		$	1,673
Renewable energy plan	2028			109			131
ARO	various			73			83
Income taxes, net	various			64			103
Renewable energy grant	2043			60			63
Energy optimization plan	various			26			32
Other	various			11			10
Total non‑current regulatory liabilities			$	2,088		$	2,095
Total regulatory liabilities			$	2,170		$	2,162

¹ These regulatory assets have arisen from alternative revenue programs and are not associated with incurred costs or capital investments. Therefore, the MPSC has provided for recovery without a return.

² These regulatory assets are included in rate base (or are expected to be included, for costs incurred subsequent to the most recently approved rate case), thereby providing a return on expenditures, or provide a specific return on investment authorized by the MPSC.

³ This regulatory asset is offset partially by liabilities. The net amount is included in rate base, thereby providing a return.

⁴ These regulatory assets represent incurred costs for which the MPSC has provided, or Consumers expects, recovery without a return on investment.

Schedule of Assets and Liabilities for PSCR and GCR Underrecoveries and Overrecoveries

In Millions
December 31	2015			2014
Assets
Accrued gas revenue		$	-		$	27
Liabilities
Accrued rate refunds			26			6