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Regulatory Matters
 6 Months Ended
Jun. 30, 2020
Public Utilities, General Disclosures [Abstract]  
Regulatory Matters REGULATORY MATTERS
2020 COVID-19 Response
In response to the COVID-19 pandemic, the MPSC issued an order on April 15, 2020 to provide guidance and direction to utilities and other stakeholders on topics including customer protections and affordability, utility accounting, regulatory activities, energy assistance, and energy waste reduction and demand response continuity.  The order authorizes the deferral of uncollectible expense that is in excess of the amount used to set current rates effective March 24, 2020, the date of Michigan's executive order to "Stay Home, Stay Safe".  The Registrants implemented the deferral in the second quarter 2020. Refer to Note 2 to the Consolidated Financial Statements, "Significant Accounting Policies" for the impact to uncollectible expense for the period. On July 23, 2020, the MPSC further ordered that utilities seeking to recover COVID-19 related expenses beyond uncollectible expense may make an informational filing no later than November 2, 2020. The Registrants will evaluate this order and continue to monitor MPSC activities involving COVID-19.
2019 Electric Rate Case Filing
DTE Electric filed a rate case with the MPSC on July 8, 2019 requesting an increase in base rates of $351 million based on a projected twelve-month period ending April 30, 2021. The requested increase in base rates is primarily due to an increase in net plant resulting from infrastructure and generation investments. The rate filing also requested an increase in return on equity from 10.0% to 10.5% and included projected changes in sales and operating and maintenance expenses. On May 8, 2020, the MPSC issued an order approving an annual revenue increase of $188 million for services rendered on or after May 15, 2020 and a return on equity of 9.9%. The order also disallowed $41 million of capital expenditures related to incentive compensation previously recorded during 2018-2020, resulting in an adjustment to Asset (gains) losses and impairment, net during the second quarter.
2020 Accounting Application
On July 9, 2020 the MPSC approved DTE Electric's request to accelerate amortization of the regulatory liability for non-plant-related accumulated deferred income tax balances that resulted from the TCJA. DTE Electric will increase amortization by $102 million beginning in May 2021, which will fully amortize this regulatory liability by the end of 2021 instead of April 2033. The accelerated amortization will not impact customer rates and will allow DTE Electric to defer its next rate case filing previously set for July 2020 to at least March 1, 2021.
2019 Gas Rate Case Filing
DTE Gas filed a rate case with the MPSC on November 25, 2019 requesting an increase in base rates of $204 million based on a projected twelve-month period ending September 30, 2021.  The requested increase in base rates is primarily due to an increase in net plant resulting from infrastructure investments and operating and maintenance expenses.  The rate filing also requests an increase in return on equity from 10.0% to 10.5% and includes projected changes in sales and working capital. 
On July 17, 2020, DTE Gas reached a settlement with all intervening parties in the case and filed a settlement agreement authorizing the company to increase base rates by $110 million, reflecting a return on equity of 9.9%. The resulting rates are a net increase to customers of $51 million as an existing Infrastructure Recovery Mechanism (IRM) surcharge will be rolled into the new base rates. The settlement agreement also approved a $20 million annual increase to amortization of the regulatory liability for non-plant accumulated deferred income tax balances resulting from the TCJA. This increased amortization will cease upon DTE Gas receiving its next rate order. Pending MPSC approval of the settlement agreement, which is expected by September 2020, DTE Gas will implement the increases to rates and amortization effective October 1, 2020. In addition, the settlement agreement disallowed capitalized expenditures related to incentive compensation, consistent with the MPSC order issued for DTE Electric on May 8, 2020. In anticipation of the disallowance, DTE Gas recorded an adjustment of $14 million to Asset (gains) losses and impairment, net on the Consolidated Statements of Operations during the second quarter 2020.