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
Form APCD-214
For diesel engines being relocated to Colorado. Submit this form along with your engine APEN. Required only for initial applications and AOS permanent replacements.
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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 Permit
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
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APEN and Permitting Requirements
For Internal Combustion Engines in Colorado. -
Step-by-step
Reporting your air emissions and applying for air permits.