On January 16, 2026, the District Department of Energy & Environment (DOEE) finalized a rule amending the tuning deadline for fuel burning equipment subject to the Reasonably Available Control Technology (RACT) requirements for major sources of Nitrogen Oxides (NOX) emissions (i.e., greater than or equal to 25 tons per year of NOX) emissions under Title 20, Chapter 8, Section 805.5 of the District of Columbia Municipal Regulations (20 DCMR § 805.5). The amended rule applies to fuel burning equipment with a heat input capacity of five million (5,000,000) British thermal units (BTU) per hour or greater. As stated by DOEE, the amendments are intended to provide increased flexibility for regulated facilities to meet required combustion tune-up deadlines while continuing to achieve meaningful emission reductions during periods of peak heating demand. The rule reflects a broader regulatory trend toward balancing enforceable emission standards with practical operational considerations faced by facility owners and operators.
Previously, 20 DCMR § 805.5(b) required owners and operators to adjust their combustion processes prior to November 1 of each year. However, DOEE received feedback from regulated facilities indicating that increasingly warmer fall and early winter temperatures have made it difficult to reach the sustained heating loads necessary to conduct effective and representative tune-ups before that deadline. Inadequate load conditions can limit the effectiveness of combustion optimization efforts, potentially undermining the emission reduction benefits that the RACT program is intended to achieve. In addition,
DOEE consulted with the Northeast States for Coordinated Air Use Management (NESCAUM) and neighboring jurisdictions and noted that many northeastern states require only one combustion tune-up per calendar year, often allowing the owner or operator discretion in scheduling based on site-specific operating conditions.
Based on this overall evaluation, DOEE determined that greater flexibility was warranted for the tuning deadline. The final rule amends 20 DCMR § 805.5(b) to require annual tune-ups no later than December 31 of each year, without specifying a start date for the tuning period. However, tune-ups are required to still meet the requirement that they must be within 13 months from the date of the last tune-up or must be conducted within 30 days of start up for any unit not operating on the required date for the tune-up, with some exceptions as noted is 20 DCMR § 805.9(b). This change in the due date, which becomes effective beginning in 2026, provides regulated entities with additional operational flexibility while preserving the requirement for annual compliance. Facilities may now plan tune-ups during periods when equipment can reliably reach optimal operating conditions, thereby improving the effectiveness of combustion adjustments and associated NOX reductions.
Regulated entities should review their compliance strategies, recordkeeping practices, and maintenance schedules to ensure alignment with the revised deadline. While the rule provides added flexibility, DOEE emphasized that facilities remain responsible for ensuring that fuel burning equipment is properly maintained and operated in a manner consistent with RACT objectives and applicable emission limits. The revised deadline does not alter existing emission standards or monitoring obligations.
For more information, including the final posted rulemaking, please visit DOEE’s website.
If you have any questions on how this change impacts your facility, please contact Trinity’s Washington, D.C. Office at 240.379.7490.
