OGE · 10-Q · 2026Q1 · Full report
Effluent Limitations / Bottom Ash Rule
OGE ENERGY CORP. · 2026-04-29 · Importance 39 · Surprise 50
The EPA's 2015 and April 2024 effluent limitation guidelines for power plants address discharges including bottom ash transport water; a supplemental rule was issued in April 2024 and EPA revised the compliance deadline in December 2025. OG&E installed dry bottom ash handling technology at Redbud and McClain to comply with the 2024 rule at an affected facility and is evaluating compliance options at another affected facility. The December 2025 final rule revised the deadline to cease bottom ash transport water discharge to December 31, 2034. OG&E continues to assess compliance needs and options for affected facilities.
Key facts
- In December 2025, the EPA published a final rule revising the deadline to cease bottom ash transport water discharge to December 31, 2034.
- In April 2024 the EPA released a supplemental effluent limitations guidelines rule and OG&E's installation of dry bottom ash handling technology at an affected facility complies with the 2024 rule requiring cessation of bottom ash transport water discharge.
Impact estimates
| metric | direction | stage | expected | basis |
|---|---|---|---|---|
| operating_income | positive | probable | — | In December 2025, the EPA published a final rule revising the deadline to cease bottom ash transport water discharge to December 31, 2034. |