Company: DTK
Filing Date: 2025-07-29
Form Type: 10-Q
Source: 0000936340-25-000182
Chunk: 174

Company: DTE ENERGY CO
Filing Date: 2025-07-29
Form: 10-Q
Item: Part I, Item 8
Chunk 174
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 ground storage tank locations.  The findings of these investigations indicated that the estimated cost to remediate these sites is expected to be incurred over the next several years.  At June 30, 2025 and December 31, 2024, DTE Electric had $10 million accrued for remediation.  These costs are not discounted to their present value.  Any change in assumptions, such as remediation techniques, nature and extent of contamination, and regulatory requirements, could impact the estimate of remedial action costs for the sites and affect DTE Electric’s financial position and cash flows.  DTE Electric believes the likelihood of a material change to the accrued amount is remote based on current knowledge of the conditions at each site.Coal Combustion Residuals and Effluent Limitations Guidelines — A final EPA rule for the disposal of coal combustion residuals, commonly known as coal ash, became effective in October 2015 and has continued to be updated in subsequent years.  The rule is based on the continued listing of coal ash as a non-hazardous waste and relies on various self-implementation design and performance standards.  DTE Electric currently owns and operates multiple coal ash storage facilities to manage coal ash from coal-fired power plants that are subject to federal, state, and local CCR and solid waste regulations.  At certain facilities, the rule required ongoing sampling and testing of monitoring wells, compliance with groundwater standards, and closure.

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Table of ContentsDTE Energy Company — DTE Electric CompanyCombined Notes to Consolidated Financial Statements (Unaudited) — (Continued)

On May 8, 2024, the EPA finalized a new rule to regulate legacy CCR surface impoundments and CCR management units.  The rule expands the reach of the CCR rule to inactive electric generation sites and previously unregulated CCR at any active facility.  The rule also extends the dewatering and stabilization criteria of the closure in place performance standards to existing CCR landfills.  DTE Electric has no legacy CCR surface impoundments, but has other regulated CCR units and is evaluating sites for CCR management units.  DTE Electric is in the process of evaluating the final 2024 rule, which may have significant financial impacts depending on the site-specific characteristics of the units that are regulated by the new rule.  Long-term financial impacts cannot be clearly defined at this time and likely will not be clearly defined until the regulated units are identified.  Challenges to the rule have been filed, and