FAIR VALUE

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated or generally unobservable inputs. The Company makes certain assumptions it believes that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. Credit risk of the Company and its counterparties is incorporated in the valuation of assets and liabilities through the use of credit reserves, the impact of which was immaterial at September 30, 2011 and December 31, 2010.

The Company believes it uses valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.

A fair value hierarchy has been established, that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability, and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. The Company classifies fair value balances based on the fair value hierarchy defined as follows:


•	Level 1 - Consists of unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access as of the reporting date.


•	Level 2 - Consists of inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.


•	Level 3 - Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.

The following table presents assets and liabilities measured and recorded at fair value on a recurring basis as of September 30, 2011:



										Netting			Net Balance at
(in Millions)	Level 1			Level 2			Level 3			Adjustments(2)			September 30, 2011
Assets:
Nuclear decommissioning trusts	$	532		$	361		$	—		$	—		$	893
Other investments(1)	48			56			—			—			104
Derivative assets:
Foreign currency exchange contracts	—			6			—			(6		)	—
Commodity Contracts:
Natural Gas	1,650			79			17			(1,698		)	48
Electricity	—			326			67			(282		)	111
Other	22			—			7			(20		)	9
Total derivative assets	1,672			411			91			(2,006		)	168
Total	$	2,252		$	828		$	91		$	(2,006	)	$	1,165
Liabilities:
Derivative liabilities:
Foreign currency exchange contracts	$	—		$	(9	)	$	—		$	6		$	(3	)
Interest rate contracts	—			(1		)	—			—			(1		)
Commodity Contracts:
Natural Gas	(1,616		)	(167		)	(12		)	1,698			(97		)
Electricity	—			(295		)	(70		)	285			(80		)
Other	(14		)	(1		)	—			20			5
Total derivative liabilities	(1,630		)	(473		)	(82		)	2,009			(176		)
Total	$	(1,630	)	$	(473	)	$	(82	)	$	2,009		$	(176	)
Net Assets as of September 30, 2011	$	622		$	355		$	9		$	3		$	989
Assets:
Current	$	1,251		$	322		$	62		$	(1,526	)	$	109
Noncurrent(3)	1,001			506			29			(480		)	1,056
Total Assets	$	2,252		$	828		$	91		$	(2,006	)	$	1,165
Liabilities:
Current	$	(1,235	)	$	(348	)	$	(60	)	$	1,529		$	(114	)
Noncurrent	(395		)	(125		)	(22		)	480			(62		)
Total Liabilities	$	(1,630	)	$	(473	)	$	(82	)	$	2,009		$	(176	)
Net Assets as of September 30, 2011	$	622		$	355		$	9		$	3		$	989

The following table presents assets and liabilities measured and recorded at fair value on a recurring basis as of December 31, 2010:



										Netting			Net Balance at
(in Millions)	Level 1			Level 2			Level 3			Adjustments(2)			December 31, 2010
Assets:
Nuclear decommissioning trusts	$	599		$	340		$	—		$	—		$	939
Other investments(1)	56			55			—			—			111
Derivative assets:
Foreign currency exchange contracts	—			20			—			(20		)	—
Commodity Contracts:
Natural Gas	1,846			128			12			(1,960		)	26
Electricity	—			649			117			(589		)	177
Other	68			4			4			(71		)	5
Total derivative assets	1,914			801			133			(2,640		)	208
Total	$	2,569		$	1,196		$	133		$	(2,640	)	$	1,258
Liabilities:
Derivative liabilities:
Foreign currency exchange contracts	$	—		$	(30	)	$	—		$	20		$	(10	)
Interest rate contracts	—			(1		)	—			—			(1		)
Commodity Contracts:
Natural Gas	(1,844		)	(263		)	(11		)	1,955			(163		)
Electricity	—			(653		)	(63		)	643			(73		)
Other	(63		)	(8		)	—			66			(5		)
Total derivative liabilities	(1,907		)	(955		)	(74		)	2,684			(252		)
Total	$	(1,907	)	$	(955	)	$	(74	)	$	2,684		$	(252	)
Net Assets as of December 31, 2010	$	662		$	241		$	59		$	44		$	1,006
Assets:
Current	$	1,299		$	663		$	49		$	(1,880	)	$	131
Noncurrent(3)	1,270			533			84			(760		)	1,127
Total Assets	$	2,569		$	1,196		$	133		$	(2,640	)	$	1,258
Liabilities:
Current	$	(1,290	)	$	(730	)	$	(21	)	$	1,899		$	(142	)
Noncurrent	(617		)	(225		)	(53		)	785			(110		)
Total Liabilities	$	(1,907	)	$	(955	)	$	(74	)	$	2,684		$	(252	)
Net Assets as of December 31, 2010	$	662		$	241		$	59		$	44		$	1,006

_____________________________


(1)	Excludes cash surrender value of life insurance investments.


(2)	Amounts represent the impact of master netting agreements that allow the Company to net gain and loss positions and cash collateral held or placed with the same counterparties.


(3)	Includes $104 million and $111 million at September 30, 2011 and December 31, 2010, respectively, of other investments that are included in the Consolidated Statements of Financial Position in Other Investments.

The following tables present the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for the three and nine months ended September 30, 2011 and 2010:



	Three Months Ended September 30, 2011
(in Millions)	Natural Gas			Electricity			Other		Total
Net Assets as of July 1, 2011	$	1		$	57		$	7	$	65
Transfers into Level 3	(1		)	(6		)	—		(7		)
Transfers out of Level 3	—			(42		)	—		(42		)
Total gains or (losses):
Included in earnings	6			23			—		29
Purchases, issuances, sales and settlements:
Settlements	(1		)	(35		)	—		(36		)
Net Assets (Liabilities) as of September 30, 2011	$	5		$	(3	)	$	7	$	9
The amount of total gains (losses) included in net income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2011	$	6		$	5		$	—	$	11



	Three Months Ended September 30, 2010
(in Millions)	Natural Gas			Electricity			Other			Total
Net Assets as of July 1, 2010	$	2		$	155		$	4		$	161
Changes in fair value recorded in income	3			21			1			25
Purchases, issuances and settlements	(1		)	(29		)	(1		)	(31		)
Transfers in/out of Level 3	—			(22		)	—			(22		)
Net Assets as of September 30, 2010	$	4		$	125		$	4		$	133
The amount of total gains (losses) included in net income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2010	$	2		$	(4	)	$	1		$	(1	)



	Nine Months Ended September 30, 2011
(in Millions)	Natural Gas		Electricity			Other			Total
Net Assets as of January 1, 2011	$	1	$	54		$	4		$	59
Transfers into Level 3	—		(4		)	—			(4		)
Transfers out of Level 3	1		(25		)	—			(24		)
Total gains or (losses):
Included in earnings	3		34			2			39
Recorded in regulatory assets/liabilities	—		—			3			3
Purchases, issuances, sales and settlements:
Purchases	—		1			—			1
Settlements	—		(63		)	(2		)	(65		)
Net Assets (Liabilities) as of September 30, 2011	$	5	$	(3	)	$	7		$	9
The amount of total gains (losses) included in net income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2011	$	5	$	17		$	2		$	24



	Nine Months Ended September 30, 2010
(in Millions)	Natural Gas			Electricity			Other			Total
Net Assets as of January 1, 2010	$	2		$	19		$	3		$	24
Changes in fair value recorded in income	4			117			1			122
Changes in fair value recorded in regulatory assets/liabilities	—			—			4			4
Purchases, issuances and settlements	(6		)	(59		)	(4		)	(69		)
Transfers in/out of Level 3	4			48			—			52
Net Assets as of September 30, 2010	$	4		$	125		$	4		$	133
The amount of total gains (losses) included in net income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2010	$	(2	)	$	58		$	1		$	57

Transfers in and transfers out of Level 3 represent existing assets or liabilities that were either previously categorized as a higher level and for which the inputs to the model became unobservable or assets and liabilities that were previously classified as Level 3 for which the lowest significant input became observable during the period. Transfers in and transfers out of Level 3 are reflected as if they had occurred at the beginning of the period. For the three and nine months ended September 30, 2011, $42 million and $25 million, respectively, of net assets reflecting inputs related to certain power transactions identified as observable due to available broker quotes were transferred from Level 3 to Level 2. For the three and nine months ended September 30, 2011, $6 million and $4 million, respectively, of net assets reflecting inputs related to certain power transactions identified as unobservable due to lack of available broker quotes were transferred from Level 2 to Level 3.

Transfers from Level 3 to Level 2 of $22 million reflect inputs related to certain power transactions identified as observable due to available broker quotes for the three months ended September 30, 2010. Transfers from Level 2 to Level 3 of $48 million reflect inputs related to certain power transactions identified as unobservable due to lack of available broker quotes for the nine months ended September 30, 2010. No significant transfers between Levels 1 and 2 occurred in the three and nine months ended September 30, 2011 and 2010.

Nuclear Decommissioning Trusts and Other Investments

The nuclear decommissioning trusts and other investments hold debt and equity securities directly and indirectly through commingled funds and institutional mutual funds. Exchange-traded debt and equity securities held directly are valued using quoted market prices in actively traded markets. The commingled funds and institutional mutual funds which hold exchange-traded equity or debt securities are valued based on the underlying securities, using quoted prices in actively traded markets. Non-exchange-traded fixed income securities are valued based upon quotations available from brokers or pricing services. A primary price source is identified by asset type, class or issue for each security. The trustees monitor prices supplied by pricing services and may use a supplemental price source or change the primary price source of a given security if the trustees determine that another price source is considered to be preferable. DTE Energy has obtained an understanding of how these prices are derived, including the nature and observability of the inputs used in deriving such prices. Additionally, DTE Energy selectively corroborates the fair values of securities by comparison of market-based price sources.

Derivative Assets and Liabilities

Derivative assets and liabilities are comprised of physical and financial derivative contracts, including futures, forwards, options and swaps that are both exchange-traded and over-the-counter traded contracts. Various inputs are used to value derivatives depending on the type of contract and availability of market data. Exchange-traded derivative contracts are valued using quoted prices in active markets. DTE Energy considers the following criteria in determining whether a market is considered active: frequency in which pricing information is updated, variability in pricing between sources or over time and the availability of public information. Other derivative contracts are valued based upon a variety of inputs including commodity market prices, broker quotes, interest rates, credit ratings, default rates, market-based seasonality and basis differential factors. DTE Energy monitors the prices that are supplied by brokers and pricing services and may use a supplemental price source or change the primary price source of an index if prices become unavailable or another price source is determined to be more representative of fair value. DTE Energy has obtained an understanding of how these prices are derived. Additionally, DTE Energy selectively corroborates the fair value of its transactions by comparison of market-based price sources. Mathematical valuation models are used for derivatives for which external market data is not readily observable, such as contracts which extend beyond the actively traded reporting period.

Fair Value of Financial Instruments

The fair value of long-term debt is determined by using quoted market prices when available and a discounted cash flow analysis based upon estimated current borrowing rates when quoted market prices are not available. The table below shows the fair value and the carrying value for long-term debt securities. Certain other financial instruments, such as notes payable, customer deposits and notes receivable are not shown as carrying value approximates fair value. See Note 4 for further fair value information on financial and derivative instruments.



	September 30, 2011				December 31, 2010
(in Billions)	Fair Value		Carrying Value		Fair Value		Carrying Value
Long-Term Debt	$	8.8	$	7.7	$	8.5	$	8.0

Nuclear Decommissioning Trust Funds

Detroit Edison has a legal obligation to decommission its nuclear power plants following the expiration of their operating licenses. This obligation is reflected as an asset retirement obligation on the Consolidated Statements of Financial Position. See Note 5.

The NRC has jurisdiction over the decommissioning of nuclear power plants and requires decommissioning funding based upon a formula. The MPSC and FERC regulate the recovery of costs of decommissioning nuclear power plants and both require the use of external trust funds to finance the decommissioning of Fermi 2. Rates approved by the MPSC provide for the recovery of decommissioning costs of Fermi 2 and the disposal of low-level radioactive waste. Detroit Edison is continuing to fund FERC jurisdictional amounts for decommissioning even though explicit provisions are not included in FERC rates. The Company believes the MPSC and FERC collections will be adequate to fund the estimated cost of decommissioning using the NRC formula. The decommissioning assets, anticipated earnings thereon and future revenues from decommissioning collections will be used to decommission Fermi 2. The Company expects the liabilities to be reduced to zero at the conclusion of the decommissioning activities. If amounts remain in the trust funds for Fermi 2 following the completion of the decommissioning activities, those amounts will be disbursed based on rulings by the MPSC and FERC.

The decommissioning of Fermi 1 is funded by Detroit Edison. Contributions to the Fermi 1 trust are discretionary.

The following table summarizes the fair value of the nuclear decommissioning trust fund assets:



	September 30,		December 31,
(in Millions)	2011		2010
Fermi 2	$	858	$	910
Fermi 1	3		3
Low level radioactive waste	32		26
Total	$	893	$	939

The costs of securities sold are determined on the basis of specific identification. The following table sets forth the gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds:



	Three Months Ended						Nine Months Ended
	September 30						September 30
(in Millions)	2011			2010			2011			2010
Realized gains	$	8		$	8		$	34		$	29
Realized losses	(9		)	(6		)	(26		)	(25		)
Proceeds from sales of securities	10			51			69			179

Realized gains and losses from the sale of securities for the Fermi 2 and the low level radioactive waste funds are recorded to the Regulatory asset and Nuclear decommissioning liability. The following table sets forth the fair value and unrealized gains for the nuclear decommissioning trust funds:



	Fair		Unrealized
(in Millions)	Value		Gains
As of September 30, 2011
Equity securities	$	485	$	52
Debt securities	395		22
Cash and cash equivalents	13		—
	$	893	$	74
As of December 31, 2010
Equity securities	$	572	$	77
Debt securities	361		11
Cash and cash equivalents	6		—
	$	939	$	88

The debt securities at September 30, 2011 and December 31, 2010 had an average maturity of approximately 7 and 6 years, respectively. Securities held in the nuclear decommissioning trust funds are classified as available-for-sale. As Detroit Edison does not have the ability to hold impaired investments for a period of time sufficient to allow for the anticipated recovery of market value, all unrealized losses are considered to be other than temporary impairments.

Unrealized losses incurred by the Fermi 2 trust are recognized as a Regulatory asset. Detroit Edison recognized $87 million and $26 million of unrealized losses as Regulatory assets at September 30, 2011 and December 31, 2010, respectively. Since the decommissioning of Fermi 1 is funded by Detroit Edison rather than through a regulatory recovery mechanism, there is no corresponding regulatory asset treatment. Therefore, unrealized losses incurred by the Fermi 1 trust are recognized in earnings immediately. There were no unrealized losses recognized for the three and nine months ended September 30, 2011 and September 30, 2010 for Fermi 1 trust assets.

Other Available-For-Sale Securities

The following table summarizes the fair value of the Company’s investment in available-for-sale debt and equity securities, excluding nuclear decommissioning trust fund assets:



	September 30, 2011				December 31, 2010
(in Millions)	Fair Value		Carrying value		Fair Value		Carrying Value
Cash equivalents	$	85	$	85	$	133	$	133
Equity securities	5		5		6		6

As of September 30, 2011, these securities were comprised primarily of money-market funds and equity securities. During the nine months ended September 30, 2011 and 2010, no amounts of unrealized losses on available for sale securities were reclassified out of other comprehensive income into losses for the period. Gains (losses) related to trading securities held at September 30, 2011 and September 30, 2010 were $(3) million and $3 million, respectively.