Colorado’s oil and gas general permits for well production facilities have changed significantly with the release of General Permit 12 (GP12) on May 28, 2026. The prior framework under General Permit 09 (GP09) and General Permit 10 (GP10) established a standardized approach for permitting common equipment and emissions sources at well sites. GP12 builds on that structure and introduces a permitting framework aligned closely with updated Regulation 7 requirements.
Background: Colorado’s GP09 and GP10 Permitting Framework
Under GP09 and GP10, oil and gas operators would submit facility-wide emission limits under a single Well Production Facility Air Pollution Emission Notice (APEN) (Form APCD-216). Operators typically relied on emissions estimates supported by default emission factors and demonstrated compliance through periodic reporting and recordkeeping tied to those predefined assumptions. This allowed field operations to move efficiently under their own conservative assumptions and standardized factors; however, it also meant that compliance was tied primarily to estimations rather than site-specific data and operational performance. Furthermore, within 18 months of submittal, the GP09 and GP10 authorization would expire forcing operators to transition each piece of equipment from the facility-wide coverage to equipment-specific general permits and individual APENs.
Updates with the Colorado’s GP12
GP12 applies specifically to well production facilities and aligns with the latest Colorado air quality regulations. The permit covers storage tanks (oil, condensate, and produced water), hydrocarbon loadout operations, gas venting from separators, natural gas and diesel engines, fugitive emissions, and routine operational emissions such as venting, blowdowns, and pigging. It uses updated regulatory definitions based on current Regulation 7 and identifies excluded facility types such as compressor stations and refineries.
The permit calls for each eligible piece of equipment at a facility to be permitted under GP12 through individual APENs (Form APCD Series 200), rather than allowing broad, grouped coverage. It also removes the requirement to transition onto individual GPs within 18 months, and rather the only timelines to adhere to are the 5-year expiration of APEN’s.
The transition to GP12 introduces important timing considerations for operators. GP12 does not immediately invalidate existing GP09 or GP10 permits and facilities already permitted under GP09 or GP10 may continue operating under those permits. The GP12 becomes the applicable pathway for new registrations beginning May 28, 2026. This creates a phased approach where both systems remain in use for a period, but new permitting efforts must align with GP12 moving forward.
Key changes with the GP12
One of the most notable changes under GP12 is the shift from facility-wide structure to equipment-specific emissions and process-based framework.
GP12 requires operators to track the operational parameters such as throughput, fuel use, and vented gas volumes. The result is a stronger connection between how facilities operate and how compliance is demonstrated.
GP12 also places greater emphasis on site-specific data. Operators are expected to develop updated emission factors based on sampling and measurement rather than relying primarily on default values. This shift improves the reliability of emissions estimates and strengthens the defensibility of compliance demonstrations. In turn, it requires more robust data collection, quality control, and coordination between field teams and compliance personnel.
Impact of GP12 on Operations
Under GP12, monitoring expectations become more rigorous, requiring facilities to track key parameters on a more continuous basis and shifting from periodic checks to ongoing operational awareness. This includes tracking equipment usage, emissions-related activities, and supporting operational data that can demonstrate compliance in real time. While this increases the level of effort involved, it also provides clearer documentation and a more transparent compliance record.
GP12 introduces additional flexibility through the concept of Alternative Operating Scenarios (AOS). This allows operators to plan for potential equipment or operational changes within the permit itself, reducing the need for frequent permit revisions. When used effectively, this can streamline facility management and provide more adaptability as operations evolve over time.
Conclusion
Overall, the transition from GP09 and GP10 to GP12 represents a shift toward a more modern compliance model. The previous permits offered clarity and simplicity through standardized requirements, while GP12 emphasizes adaptability, data quality, and alignment with real-world operations. For operators, this means investing more effort upfront in planning and data management but gaining a more defensible and flexible permitting framework in return.
In the near term, operators should evaluate how GP12 affects upcoming permitting activities and consider whether transitioning existing facilities may provide long-term benefits. Understanding the new expectations and building systems to support data collection and compliance tracking will be critical to successfully navigating this change. As GP12 becomes the standard for new well production facility permits, early preparation will position operators to meet requirements efficiently and maintain compliance with confidence.
