REGULATORY MATTERS

Regulation

DTE Electric and DTE Gas are subject to the regulatory jurisdiction of the MPSC, which issues orders pertaining to rates, recovery of certain costs, including the costs of generating facilities and regulatory assets, conditions of service, accounting and operating-related matters. DTE Electric is also regulated by the FERC with respect to financing authorization and wholesale electric activities. Regulation results in differences in the application of generally accepted accounting principles between regulated and non-regulated businesses.

The Company is unable to predict the outcome of the unresolved regulatory matters discussed herein. Resolution of these matters is dependent upon future MPSC orders and appeals, which may materially impact the financial position, results of operations and cash flows of the Company.

Regulatory Assets and Liabilities

DTE Electric and DTE Gas are required to record regulatory assets and liabilities for certain transactions that would have been treated as revenue or expense in non-regulated businesses. Continued applicability of regulatory accounting treatment requires that rates be designed to recover specific costs of providing regulated services and be charged to and collected from customers. Future regulatory changes or changes in the competitive environment could result in the discontinuance of this accounting treatment for regulatory assets and liabilities for some or all of our businesses and may require the write-off of the portion of any regulatory asset or liability that was no longer probable of recovery through regulated rates. Management believes that currently available facts support the continued use of regulatory assets and liabilities and that all regulatory assets and liabilities are recoverable or refundable in the current rate environment.

The following are balances and a brief description of the regulatory assets and liabilities at December 31:



	2012			2011
	(In millions)
Assets
Recoverable pension and postretirement costs:
Pension	$	2,420		$	2,208
Postretirement costs	426			778
Asset retirement obligation	424			420
Recoverable Michigan income taxes	304			324
Recoverable income taxes related to securitized regulatory assets	226			316
Cost to achieve Performance Excellence Process	96			116
Accrued PSCR/GCR revenue	87			147
Other recoverable income taxes	76			81
Choice incentive mechanism	66			166
Unamortized loss on reacquired debt	63			64
Deferred environmental costs	58			49
Recoverable restoration expense	49			58
Recoverable revenue decoupling	28			18
Enterprise Business Systems costs	16			18
Other	78			90
	4,417			4,853
Less amount included in current assets	(182		)	(314		)
	$	4,235		$	4,539

Securitized regulatory assets	$	413		$	577



	2012			2011
	(In millions)
Liabilities
Asset removal costs	$	439		$	419
Renewable energy	230			192
Refundable revenue decoupling/deferred gain	127			127
Negative pension offset	105			120
Refundable income taxes	56			66
Over recovery of Securitization	54			53
Refundable uncollectible expense	37			31
Energy Optimization	34			34
Accrued PSCR/GCR refund	16			26
Fermi 2 refueling outage	12			23
Low Income Energy Efficiency Fund	—			26
Other	10			9
	1,120			1,126
Less amount included in current liabilities	(89		)	(107		)
	$	1,031		$	1,019

As noted below, certain regulatory assets for which costs have been incurred have been included (or are expected to be included, for costs incurred subsequent to the most recently approved rate case) in DTE Electric or DTE Gas’s rate base, thereby providing a return on invested costs (except as noted). Certain other regulatory assets are not included in rate base but accrue recoverable carrying charges until surcharges to collect the assets are billed. Certain regulatory assets do not result from cash expenditures and therefore do not represent investments included in rate base or have offsetting liabilities that reduce rate base.

ASSETS

•

Recoverable pension and postretirement costs — Accounting rules for pension and other postretirement benefit costs require, among other things, the recognition in other comprehensive income of the actuarial gains or losses and the prior service costs that arise during the period but that are not immediately recognized as components of net periodic benefit costs. DTE Electric and DTE Gas record the impact of actuarial gains or losses and prior services costs as a regulatory asset since the traditional rate setting process allows for the recovery of pension and postretirement costs. The asset will reverse as the deferred items are amortized and recognized as components of net periodic benefit costs. (a)


•	Asset retirement obligation — This obligation is primarily for Fermi 2 decommissioning costs. The asset captures the timing differences between expense recognition and current recovery in rates and will reverse over the remaining life of the related plant. (a)

•

Recoverable Michigan income taxes — In July 2007, the Michigan Business Tax (MBT) was enacted by the State of Michigan. State deferred tax liabilities were established for the Company’s utilities, and offsetting regulatory assets were recorded as the impacts of the deferred tax liabilities will be reflected in rates as the related taxable temporary differences reverse and flow through current income tax expense. In May 2011, the MBT was repealed and the Michigan Corporate Income Tax (MCIT) was enacted. The regulatory asset was remeasured to reflect the impact of the MCIT tax rate. (a)


•	Recoverable income taxes related to securitized regulatory assets — Receivable for the recovery of income taxes to be paid on the non-bypassable securitization bond surcharge. A non-bypassable securitization tax surcharge recovers the income tax over a fourteen-year period ending 2015. (a)


•	Cost to achieve Performance Excellence Process (PEP) — The MPSC authorized the deferral of costs to implement the PEP. These costs consist of employee severance, project management and consultant support. These costs are amortized over a ten-year period beginning with the year subsequent to the year the costs were deferred.


•	Accrued PSCR/GCR revenue — Receivable for the temporary under-recovery of and a return on fuel and purchased power costs incurred by DTE Electric which are recoverable through the PSCR mechanism and temporary under-recovery of and return on gas costs incurred by DTE Gas which are recoverable through the GCR mechanism.


•	Other recoverable income taxes — Income taxes receivable from DTE Electric’s customers representing the difference in property-related deferred income taxes and amounts previously reflected in DTE Electric’s rates. This asset will reverse over the remaining life of the related plant. (a)


•	Choice incentive mechanism (CIM) — DTE Electric receivable for non-fuel revenues lost as a result of fluctuations in electric Customer Choice sales. The CIM was terminated in the October 20, 2011 MPSC order issued to DTE Electric.


•	Unamortized loss on reacquired debt — The unamortized discount, premium and expense related to debt redeemed with a refinancing are deferred, amortized and recovered over the life of the replacement issue.


•	Deferred environmental costs — The MPSC approved the deferral of investigation and remediation costs associated with DTE Gas's former MGP sites. Amortization of deferred costs is over a ten-year period beginning in the year after costs were incurred, with recovery (net of any insurance proceeds) through base rate filings. (a)


•	Recoverable restoration expense — Receivable for the MPSC approved restoration expense tracking mechanism that tracks the difference between actual restoration expense and the amount provided for in base rates, recognized pursuant to the MPSC authorization. The restoration expense tracking mechanism was terminated in the October 20, 2011 MPSC order issued to DTE Electric.

•

Recoverable revenue decoupling — Amounts recoverable from DTE Gas customers for the change in revenue resulting from the difference in weather-adjusted average sales per customer compared to the base level of average sales per customer established by the MPSC. The December 2012 order in DTE Gas' rate case requires the RDM be discontinued effective November 1, 2012. The order provides for a new RDM beginning in November 2013.


•	Enterprise Business Systems (EBS) costs — The MPSC approved the deferral and amortization over ten years beginning in January 2009 of EBS costs that would otherwise be expensed.

•

Securitized regulatory assets — The net book balance of the Fermi 2 nuclear plant was written off in 1998 and an equivalent regulatory asset was established. In 2001, the Fermi 2 regulatory asset and certain other regulatory assets were securitized pursuant to PA 142 and an MPSC order. A non-bypassable securitization bond surcharge recovers the securitized regulatory asset over a fourteen-year period ending in 2015.

_________________________________


(a)	Regulatory assets not earning a return or accruing carrying charges.

LIABILITIES


•	Asset removal costs — The amount collected from customers for the funding of future asset removal activities.


•	Renewable energy — Amounts collected in rates in excess of renewable energy expenditures.

•

Refundable revenue decoupling / deferred gain — At December 31, 2011, amounts were accrued as refundable to DTE Electric customers for the change in revenue resulting from the difference between actual average sales per customer compared to the base level of average sales per customer established by the MPSC. In 2012, the revenue decoupling liability was reversed and a new regulatory liability representing DTE Electric's obligation to refund the resulting gain was accrued. See further discussion below.


•	Negative pension offset — DTE Gas’ negative pension costs are not included as a reduction to its authorized rates; therefore, the Company is accruing a regulatory liability to eliminate the impact on earnings of the negative pension expense accrued. This regulatory liability will reverse to the extent DTE Gas’ pension expense is positive in future years.


•	Refundable income taxes — Income taxes refundable to DTE Gas’ customers representing the difference in property-related deferred income taxes payable and amounts recognized pursuant to MPSC authorization.


•	Over recovery of Securitization — Over recovery of securitization bond expenses.

•

Refundable uncollectible expense (UETM )— DTE Electric and DTE Gas liability for the MPSC approved uncollectible expense tracking mechanism that tracks the difference in the fluctuation in uncollectible accounts and amounts recognized pursuant to the MPSC authorization. The UETM was terminated for DTE Electric in the October 20, 2011 MPSC rate case order and terminated for DTE Gas in the December 20, 2012 MPSC approval of the partial settlement agreement.


•	Energy Optimization (EO) - Amounts collected in rates in excess of energy optimization expenditures.


•	Accrued PSCR/GCR refund — Liability for the temporary over-recovery of and a return on power supply costs and transmission costs incurred by DTE Electric which are recoverable through the PSCR mechanism and temporary over-recovery of and a return on gas costs incurred by DTE Gas which are recoverable through the GCR mechanism.


•	Fermi 2 refueling outage — Accrued liability for refueling outage at Fermi 2 pursuant to MPSC authorization.


•	Low Income Energy Efficiency Fund (LIEEF) — Escrow of LIEEF funds collected by DTE Electric and DTE Gas as ordered by the MPSC pursuant to July 2011 Michigan Court of Appeals decision.

2009 Electric Rate Case Filing - Court of Appeals Decision/Refundable Deferred Gain

On April 10, 2012, the Michigan Court of Appeals (COA) issued a decision relating to an appeal of the January 2010 MPSC order in DTE Electric's January 2009 rate case filing.

The COA found that the record of evidence in the 2009 rate case order was insufficient to support the MPSC's authorization to recover costs for the pilot advanced metering infrastructure (AMI) program and remanded this matter to the MPSC. The MPSC had approved $37 million of rate base related to the AMI program in the January 2010 order. DTE Electric is currently operating its AMI program pursuant to the MPSC's approval set forth in its October 20, 2011 order, which was not reviewed by or subject to the COA's April 10, 2012 decision. On November 28, 2012, DTE Electric filed the necessary data and evidence to the MPSC supporting the AMI program expenditures. DTE Electric's AMI program expenditures are $110 million as of December 31, 2012, net of Department of Energy matching grant funds of $60 million.

The COA affirmed the use of a number of tracking mechanisms (restoration, line clearance, uncollectibles expense and choice incentive) and the peak demand computations approved in the January 2010 order. The COA also determined that the MPSC only had statutory authority to implement a Revenue Decoupling Mechanism (RDM) for gas providers, but not for electric providers, thereby reversing the MPSC's decision to authorize an RDM for DTE Electric. DTE Electric had accrued a total of $127 million of RDM refund liabilities for the 2010 and 2011 RDM reconciliation periods. No party appealed the COA decision regarding the RDM determination.

On August 1, 2012, DTE Electric filed an application for approval of accounting authority to defer for future amortization the gain resulting from the reversal of the Company's $127 million regulatory liability associated with the operation of the RDM. On August 14, 2012, the MPSC dismissed DTE Electric's initial pilot RDM reconciliation cases. On September 25, 2012, the MPSC issued an order approving the Company's accounting application. As described in the accounting application, DTE Electric will amortize the new regulatory liability to income, at a monthly rate of approximately $10.6 million, beginning January 2014. It is currently anticipated that with this accounting treatment, along with other cost saving measures, DTE Electric will not need to increase base rates until 2015. If DTE Electric's base rates are increased prior to January 1, 2015, the Company will cease amortization and refund to customers the remaining unamortized balance of the new regulatory liability.

Energy Optimization (EO) Plans

The EO plan is designed to help each customer class reduce their electric usage by: 1) building customer awareness of energy efficiency options and 2) offering a diverse set of programs and participation options that result in energy savings for each customer class.

In May 2012, DTE Electric and DTE Gas both filed separate applications for approval of their respective reconciliations of their 2011 EO plan expenses. On October 31, 2012, the MPSC approved DTE Electric's reconciliation and on November 16, 2012, the MPSC approved DTE Gas' reconciliation. The MPSC orders also approved performance incentive surcharges for DTE Electric of $8.4 million and for DTE Gas of $3.4 million to be applied to customer bills rendered on and after January 1, 2013.

In August 2012, Detroit Edison and MichCon filed amended EO plans with the MPSC. DTE Electric's EO plan application proposed the recovery of EO expenditures for the period 2013-2015 of $224 million and DTE Gas' EO plan application proposed the recovery of EO expenditures for the period 2013-2015 of $66 million. Both applications requested approval of surcharges to recover these costs.

DTE Electric Restoration Expense Tracker Mechanism (RETM) and Line Clearance Tracker (LCT) Reconciliation

In January 2012, DTE Electric filed an application with the MPSC for approval of the reconciliation of its 2011 RETM and LCT. The Company's 2011 restoration expenses were higher than the amount provided in rates. Accordingly, DTE Electric requested net recovery of approximately $44 million. An MPSC order is expected in the first quarter of 2013.

DTE Electric Uncollectible Expense True-Up Mechanism (UETM)

In February 2012, DTE Electric filed an application with the MPSC for approval of its UETM for 2011 requesting authority to refund approximately $9 million consisting of costs related to 2011 uncollectible expense. An MPSC order is expected in the first quarter of 2013.

DTE Electric Choice Incentive Mechanism (CIM)

In January 2012, DTE Electric filed an application with the MPSC for approval of its CIM reconciliation for the period from January 1, 2011 through October 28, 2011, the termination date of the CIM pursuant to the October 20, 2011 MPSC rate order. On January 17, 2013, the MPSC approved a settlement agreement authorizing the Company to recover $63 million, plus interest, from its customers through a surcharge to be implemented over a ten-month period beginning March 2013 through December 2013.

Power Supply Cost Recovery Proceedings

The PSCR process is designed to allow DTE Electric to recover all of its power supply costs if incurred under reasonable and prudent policies and practices. DTE Electric's power supply costs include fuel and related transportation costs, purchased and net interchange power costs, nitrogen oxide and sulfur dioxide emission allowances costs, urea costs, transmission costs and MISO costs. The MPSC reviews these costs, policies and practices for prudence in annual plan and reconciliation filings.

2011 PSCR Year - In March 2012, DTE Electric filed the 2011 PSCR reconciliation calculating a net under-recovery of $148 million that includes an under-recovery of $52.6 million for the 2010 PSCR year. In addition, the 2011 PSCR reconciliation includes an over-refund of $3.8 million for the 2011 refund of the self-implementation rate increase related to the 2009 electric rate case filing and a credit of $10.5 million related to the expiration of a wholesale power sales contract.

2013 Plan Year - In September 2012, DTE Electric filed its 2013 PSCR plan case seeking approval of a levelized PSCR factor of 4.74 mills/kWh above the amount included in base rates for all PSCR customers. The filing supports a total power supply expense forecast of $1.5 billion. The plan also includes approximately $81 million for the recovery of its projected 2012 PSCR under-recovery.

2012 Gas Rate Case Filing

DTE Gas filed a rate case on April 20, 2012 based on a projected test year for the twelve-month period ending October 31, 2013. The filing with the MPSC requested an increase in base rates of approximately $77 million that is required to recover higher costs associated with increased investments in plant, the impact of sales reductions due to customer losses and continuing conservation, and increasing operating costs, primarily pipeline integrity and leak remediation expenses. On October 24, 2012, DTE Gas filed notification with the MPSC indicating that it intended to self-implement $27 million of rate relief beginning in November 2012, suspend the RDM and terminate the monthly credit which was implemented to remove the Vulnerable Household Warmth Fund collections from rates. On December 20, 2012, the MPSC approved a partial settlement agreement and authorized the Company to increase its annual gas revenues by $19.9 million for service rendered on and after January 1, 2013. A refund liability of approximately $1 million, representing the difference between the final ordered rate relief and the self- implemented revenue, was accrued as of December 31, 2012.

The case also included a proposal for an infrastructure recovery mechanism (IRM) designed to recover DTE Gas' projected costs related to its gas main renewal and meter move out programs. The approved settlement did not resolve the IRM which will continue to be litigated with an order expected by April 2013.

DTE Gas UETM

In March 2012, DTE Gas filed an application with the MPSC for approval of its UETM for 2011 requesting authority to refund approximately $7 million, consisting of a $19 million over-recovery related to 2011 uncollectible expense, partially offset by $12 million related to the 2010 UETM under-recovery. In September 2012, the MPSC approved a settlement agreement approving the net refund of $7 million and the implementation of credits and surcharges over a twelve-month period beginning in November 2012. The December 2012 order in DTE Gas' rate case requires the UETM be terminated effective November 1, 2012 and the reconciliation to be filed by March 31, 2013. DTE Gas accrued a refund obligation of approximately $20 million for the 2012 over-recovery.

DTE Gas Revenue Decoupling Mechanism (RDM)

In September 2011, DTE Gas filed an application with the MPSC for approval of its RDM reconciliation for the period July 1, 2010 through June 30, 2011. DTE Gas' RDM application proposed the recovery of approximately $20 million. On July 13, 2012, the MPSC approved a settlement agreement approving the RDM reconciliation and the implementation of a surcharge over a twelve-month period beginning in August 2012. As a result of the provisions of the settlement, during the quarter ended June 30, 2012, DTE Gas recognized an additional $5 million of revenue related to the 2010/2011 period and $3 million related to the 2011/2012 period.

In October 2012, DTE Gas filed an application with the MPSC for approval of its RDM reconciliation for the period July 1, 2011 through June 30, 2012. The application requests authority to adjust existing retail gas rates so as to collect a net amount of $8.6 million, plus interest. An order is expected in the first quarter of 2013.

The December 2012 order in DTE Gas' rate case requires the RDM be discontinued effective November 1, 2012 and a reconciliation be filed by October 31, 2013. DTE Gas recognized approximately $5 million for the under-recovery during the July through October 2012 period. The order provides for a new RDM beginning in November 2013 for the period November 1, 2013 through October 31, 2014. The new RDM decouples weather normalized distribution revenue inside caps. The caps are tied to expected conservation targets: 1.125% in the first reconciliation period and 2.25% for the second and future periods.

DTE Gas Depreciation Filing

In June 2012, DTE Gas filed a depreciation study, as ordered by the MPSC, indicating an annual depreciation expense increase of $12.4 million. Pursuant to the December 2012 order in DTE Gas' rate case, the final approved depreciation rates will be implemented in conjunction with the MPSC's order in DTE Gas' next general rate case. Management cannot predict when DTE Gas will file its next rate case.

Gas Cost Recovery Proceedings

The GCR process is designed to allow DTE Gas to recover all of its gas supply costs if incurred under reasonable and prudent policies and practices. The MPSC reviews these costs, policies and practices for prudence in annual plan and reconciliation filings.

2010-2011 GCR Year - An MPSC order was issued on August 14, 2012 approving the GCR reconciliation for the twelve-month period ended March 31, 2011. The MPSC authorized DTE Gas to include in its 2011-2012 GCR reconciliation beginning balance the net over-recovery of approximately $6 million.

2011-2012 GCR Year - In June 2012, DTE Gas filed its GCR reconciliation for the twelve months ending March 31, 2012 calculating a net under-recovery of $6.4 million.

Gas Recovery of Costs to Achieve (CTA) Performance Excellence Process

DTE Gas incurred CTA restructuring expense during a review of its operations which began in 2005. In September 2006, the MPSC issued an order approving a settlement agreement that allowed DTE Electric and DTE Gas, commencing in 2006, to defer the incremental CTA. Further, the order provided for DTE Electric and DTE Gas to amortize the CTA deferrals over a ten-year period beginning with the year subsequent to the year the CTA was deferred. The September 2006 order did not provide a regulatory recovery mechanism for DTE Gas, therefore DTE Gas expensed CTA incurred during the period 2006 through 2008. A June 2010 MPSC order provided for DTE Gas’ recovery of the regulatory unamortized balance of CTA. DTE Gas deferred and recognized in income approximately $32 million ($20 million after-tax) of previously expensed CTA in 2010.