If your diesel engine is NOT at an oil and gas facility, go to Air permits for non-oil & gas for applicable forms and guidance. A complete permit application for an oil & gas facility must include all applicable elements on Form APCD-100.
Diesel (Compression Ignition) Engine APEN (Form APCD-233)
Use an APEN to apply for a new permit; request a modification to an existing permit; complete a routine (five-year) renewal for an existing permitted source or report changes in emissions, production or equipment.
NSPS-40 CFR Part 60, Subpart IIII Addendum Form
For diesel engines being relocated to Colorado. Submit this form along with your engine APEN. Required only for initial applications and AOS permanent replacements.
PS Memo 10-03
Guidance on NSPS Subpart IIII Relocation to Colorado.
NSPS 40 CFR Part 60, Subpart IIII Fact Sheet
Stationary Compression Ignition Internal Combustion Engines (stationary diesel engines).
Alternate Operating Scenario (AOS)
Report a permanent engine replacement for your engine.
General Permits offer a streamlined approach to air emissions permitting. Review the general permit to determine if your engine meets the applicability requirements.
GP06: Diesel Engines
Operating and Maintenance (O&M) plan
Required for all process units with emission controls at a synthetic minor or major stationary source. Visit the Oil & gas operating and maintenance plan page for guidance and more information.
The Division has not yet developed an O&M Plan template for diesel engines. If an O&M Plan is required for your diesel engine, you need to develop your own and the Division will review it.
Calculate your diesel engine emissions
The links below will download a Microsoft Excel Spreadsheet.
Guidance for diesel engine permits
APEN and Permitting Requirements
For Internal Combustion Engines in Colorado.
Reporting your air emissions and applying for air permits.