Colorado’s Industrial Decarbonization Success 

Colorado's GEMM programs have delivered impressive emission reduction results ahead of schedule. Established under the state's 2021 Environmental Justice Act, the two-phase framework covers Colorado's largest industrial emitters. GEMM 1 targeted the four most trade-exposed heavy industries with intensity-based standards, and GEMM 2 applied absolute emissions caps to 18 additional large manufacturers. By the end of 2024, the sector had already achieved a 23.4% reduction below 2015 levels, surpassing the 2030 statutory target of 20% six years early. GEMM 1 includes steel and cement industries. GEMM 2 expands coverage to energy and fuel production including petroleum refining and ethanol, food and agricultural processing, and materials manufacturing such as aluminum, glass, and gypsum, where emissions are largely tied to high-temperature heat and continuous energy demand. It also includes chemical and mineral processing, as well as advanced manufacturing like semiconductors, where emissions may come from specialized process gases and steady electricity use.

Total covered emissions dropped from roughly 5.13 million to 3.93 million metric tons CO₂e, with projected economic benefits exceeding $1.1 billion through 2050. The GEMM sources make up ~25% of the industrial and manufacturing sector emissions in the state. Sector-wide, emissions have dropped ~15% from 2015 to 2023, from 18.4 to 15.8 MMT. In-state industries benefit from GEMM through reduced operational costs driven by energy efficiency improvements and process optimization, which lower fuel use and exposure to volatile energy prices. At the same time, early emissions reductions can enhance long-term competitiveness by positioning companies to meet evolving regulatory requirements, access Colorado’s emission trading system and other low-carbon markets, and attract investment from companies prioritizing cleaner supply chains.

Several state agency-led design choices drove this success. The phased structure gave facilities time to plan and invest while differentiating between trade-exposed and other industries. Specifically, regulated companies were required to conduct energy and greenhouse gas emissions audits that would assess ways to reduce greenhouse gas emissions and save energy.  The regulation required facility-level GHG Reduction Plans with independent third-party review to ensure accountability and required implementation of cost effective control technology, which ensured implementation of onsite reductions came before use of the credit trading program. A technology-agnostic approach allowed facilities to find their own least-cost pathways compliance strategies tailored to their operations, with solutions such as methane capture at wastewater operations, electrification in food and beverage processing, and process optimization or carbon capture all contributing to reductions. The program utilized a cost-effectiveness threshold tied to the social cost of carbon metric outlined by the former Federal Interagency Working Group. Layered financial incentives including $168 million in refundable tax credits and grant programs reduced barriers to industry participation. Finally, the legislation required that the program applies an environmental justice lens which links industrial compliance to local air quality improvements in disproportionately impacted communities.

State Strategies for Success with Limited Decarbonization Support 

With strategic framing, existing regulatory tools, and smart incentive design, other states can replicate meaningful industrial decarbonization even without explicit legislative direction. 

1. Start with Voluntary Incentive Programs Tied to Reporting

Before establishing mandatory requirements, a state can begin building infrastructure and industry relationships through voluntary incentive programs. Offer grants, tax credits, or loan guarantees to facilities willing to conduct energy and emissions audits, identify reduction opportunities, and implement emission reduction projects. States can explore a reporting requirement as a condition of incentive eligibility. Colorado’s Industrial Tax Credit Offering CITCO  along with the Clean Air Program Grants offer financial support for project implementation.

Programs can be designed to incentivize industrial energy efficiency and paired with existing utility offerings. By reducing existing industrial energy demand through efficiency, energy storage or other projects states can free up electrons on the grid for new uses.

2. Utilize Co-Pollutant Standards Under Existing CAA Authority

While Colorado primarily relied on its own state environmental legislation, other states could lead with the federal Clean Air Act (CAA). State programs addressing NOₓ, CO, PM₂.₅, volatile organic compounds, and hazardous air pollutants from large industrial sources are already within the established authority of State Implementation Plans (SIPs) and existing permitting frameworks. Importantly, GHGs are intrinsically linked to the combustion of fossil fuels and therefore the existing criteria pollutant requirements for those processes. A state could structure an industrial program around criteria pollutant/HAP reduction requirements tied to CAA obligations, while tracking and crediting associated GHG reductions as a co-benefit. 

3. Explore Partnerships

Connect with local green banks or lending institutions to understand what collaborative funding models can be developed to maximize the use of state dollars. Where possible, design programs around direct relationships with industry associations. Collaborate with local Industrial Training and Assessment Centers (ITAC)  to understand project types that may have already been identified at facilities to reduce emissions. Explore encouraging or requiring facilities to receive industrial assessment which identifies cost effective measures to increase energy efficiency and reduce emissions through entities like ITAC’s or others. Support implementation of the identified measures by funding feasibility studies, offering grants or low-cost financing options for equipment retrofits or replacements.

4. Identify Success Stories 

In Colorado, companies with their own corporate emission reduction goals have been the most effective early partners in reducing facility emissions. Thus, a strong starting point is to identify manufacturers already pursuing decarbonization due to corporate sustainability commitments, customer pressure, or investor expectations and partner with them as program champions. Document and publicize their results including emission reductions and cost savings. 

Colorado's GEMM program has already produced successes. For example, several cement facilities have achieved meaningful emissions reductions by moving away from carbon-intensive fuels like coal and petroleum coke and replacing those inputs with natural gas, tire-derived fuel, and biomass materials. This reduces clinker-to-cement ratios through blended cement formulations and greater use of supplementary cementitious materials, reducing the emissions intensity of each ton of cement produced. Semiconductor facilities have achieved significant emissions reductions by substituting process gases and heat transfer fluids with lower global warming potential alternatives and by expanding thermal abatement systems across their fabrication facilities. These examples illustrate that facilities in different sectors, with different processes, have each found pathways to substantial emissions reductions by optimizing what is within their operational control.

Conclusion

Colorado's GEMM program demonstrates that strategic program design can deliver meaningful industrial emissions reductions. The program's outcomes indicate that industrial decarbonization and economic competitiveness can advance together, offering a replicable roadmap for other states to emulate. States can utilize voluntary incentive programs, existing regulatory authority, and targeted financial support to lay the groundwork for meaningful industrial emissions reductions while building industry partnerships that make continued progress possible.

For more information contact: rachel@s2strategies.org