New Mexico and Hawaii Low-Carbon Fuel Policies

Two US states advance low-carbon fuel programmes with different timelines

New Mexico and Hawaii are both introducing low-carbon fuel policies. However, they sit at different stages of development. New Mexico has already enacted its programme, while Hawaii is still drafting legislation. Both states are extending this type of regulation beyond the West Coast, where similar schemes have operated for several years.

The distinction matters because low-carbon fuel standards create market pressure to shift away from high-carbon fuels. They work by setting carbon intensity targets and allowing fuel suppliers to trade credits. Suppliers that exceed the standard generate credits. Those that fall short must buy them.

For UK businesses with US operations or supply chains, these programmes introduce compliance costs and procurement complexity. They also signal how fuel regulation may develop in other jurisdictions. Understanding the mechanics and timelines helps businesses plan for similar policy shifts elsewhere.

New Mexico introduces mandatory carbon intensity reductions from 2026

New Mexico signed its Clean Transportation Fuel Program into law in March 2024. The programme took effect on 1 April 2026. This makes New Mexico the fourth US state to implement a low-carbon fuel standard. Notably, it is the first state outside the Pacific Coast region to do so.

The programme sets clear reduction targets. Transportation fuel suppliers must cut carbon intensity by 20% below 2018 levels by 2030. A further reduction to 30% below 2018 levels is required by 2040. These targets apply to the lifecycle emissions of fuels, from extraction through to combustion.

New Mexico’s Environment Department administers the programme. It functions as a carbon intensity standard with a credit trading mechanism. Fuel suppliers that use lower-carbon fuels generate credits. Suppliers using higher-carbon fuels must purchase credits to meet compliance obligations. The state has structured the programme around annual declining carbon intensity requirements.

Importantly, the programme does not impose a state fuel tax or pump surcharge. It also does not regulate petrol and diesel retailers unless they are also fuel importers. Consequently, the compliance burden falls primarily on importers and larger fuel distributors rather than retail forecourts.

Hawaii proposes clean fuel standard with longer implementation period

Hawaii is taking a different approach. Its clean fuel programme remains in the legislative development phase. The state has not yet enacted the policy into law. Therefore, timelines and final requirements may still change.

According to proposals under consideration, Hawaii would direct its state energy office to phase in a clean fuel standard. The programme would require a reduction of at least 10% below 2019 carbon intensity levels by 2035. A more substantial reduction of 50% below 2019 levels would be required by 2045.

Hawaii’s proposed programme forms part of broader state-level clean fuel legislation across the United States. Several other states are considering similar policies. This indicates growing momentum for low-carbon fuel standards beyond their original West Coast stronghold.

Hawaii’s proposal is particularly significant because the state depends heavily on imported fuels. Unlike mainland states, Hawaii has limited domestic fuel production. Consequently, any carbon intensity standard must account for fuel imported by sea. This adds logistical and compliance complexity compared to programmes in states with pipeline or domestic refinery access.

Credit trading systems reward lower-carbon alternatives

Both programmes rely on tradable credit systems. These systems create financial incentives to reduce fuel carbon intensity without directly regulating prices at the pump. The mechanism works by assigning carbon intensity values to different fuels based on their lifecycle emissions.

Fuels with lower carbon intensity than the annual benchmark generate credits. For example, biodiesel, renewable diesel, and electricity for electric vehicles typically qualify for credits. Meanwhile, conventional petrol and diesel exceed the benchmark and create deficits. Suppliers with deficits must purchase credits from those with surpluses.

This market-based approach allows flexibility in how suppliers meet their obligations. Some may invest in lower-carbon fuel blends. Others may purchase credits rather than changing their fuel mix. The result is a market price for carbon intensity reduction, which fluctuates based on supply and demand for credits.

Over time, annual benchmarks decline. Consequently, the carbon intensity threshold tightens each year. This forces gradual market transformation towards lower-carbon fuels. The pace of that transformation depends on credit prices, technology availability, and fuel production capacity.

New Mexico’s early adoption tests regional fuel market dynamics

New Mexico’s programme is notable because it operates in a different fuel market context than California, Oregon, and Washington. The state has significant oil and gas production. It also sits within different fuel supply networks than the Pacific Coast states.

This matters for credit market dynamics. California’s low-carbon fuel standard has operated since 2011. It has developed a mature credit market with established pricing and trading patterns. New Mexico will need to build equivalent infrastructure while integrating with a different regional fuel supply chain.

The state’s fuel importers and distributors now face compliance obligations. They must track the carbon intensity of their fuel supplies and either generate or purchase credits. For companies operating across multiple states, this adds another layer of regulatory complexity. Compliance systems must now account for state-specific carbon intensity benchmarks and credit requirements.

Moreover, New Mexico’s programme tests whether low-carbon fuel standards can function effectively outside the West Coast policy ecosystem. If the programme succeeds, it may encourage other interior states to adopt similar policies. Conversely, implementation challenges could slow momentum elsewhere.

Hawaii’s proposal addresses island fuel supply challenges

Hawaii’s proposed programme faces unique implementation challenges. The state imports nearly all its transportation fuel. Supply chains are longer and more complex than mainland alternatives. Therefore, tracking lifecycle emissions requires accounting for shipping and handling stages that mainland programmes may treat differently.

Additionally, Hawaii has limited options for domestic low-carbon fuel production. The state cannot easily source renewable diesel or biodiesel from nearby refineries. Consequently, it may need to import these fuels as well. This could increase costs compared to states with more local production capacity.

However, Hawaii already has higher fuel prices than most US states. Therefore, the incremental cost impact of a clean fuel standard may be more politically acceptable. The state also has strong policy commitments to decarbonisation across multiple sectors. A clean fuel standard aligns with broader climate goals already embedded in state planning.

If enacted, Hawaii’s programme would provide a test case for island jurisdictions considering similar policies. Other island states or territories could study Hawaii’s experience to inform their own policy development. This includes potential applications in Caribbean territories or Pacific island nations.

Core facts for UK businesses with US exposure

• New Mexico’s Clean Transportation Fuel Program became law in March 2024 and took effect on 1 April 2026, making it the first low-carbon fuel standard outside the Pacific Coast states.
• New Mexico requires carbon intensity reductions of 20% below 2018 levels by 2030 and 30% by 2040, creating compliance obligations for fuel importers and distributors.
• Hawaii is still developing legislation that would require 10% reductions below 2019 levels by 2035 and 50% reductions by 2045, with a longer implementation timeline than New Mexico.
• Both programmes use tradable credit systems that allow fuel suppliers to buy and sell credits based on the carbon intensity of their fuel supplies.
• New Mexico’s programme does not impose fuel taxes or regulate retail forecourts unless they also import fuel, focusing compliance obligations on larger distributors.
• Hawaii’s proposed programme must account for the state’s dependence on imported fuels and limited domestic low-carbon fuel production capacity.
• These state-level programmes expand low-carbon fuel policy beyond the West Coast and may influence similar policy development in other US states and international jurisdictions.

What this means for businesses operating across US states

For UK businesses with US operations, these programmes introduce state-specific compliance requirements. Companies supplying fuel to New Mexico must now track carbon intensity and manage credit obligations. Those planning operations in Hawaii may face similar requirements if the legislation passes.

Supply chain complexity increases when different states impose different standards. Fuel distributors operating regionally must track multiple compliance regimes. Consequently, administrative costs rise. Systems must account for varying benchmarks, credit markets, and reporting requirements across jurisdictions.

Transport-intensive businesses should also consider indirect cost impacts. Fuel suppliers facing credit purchase obligations may pass costs through to customers. Therefore, haulage, logistics, and distribution firms could see fuel cost increases even without direct compliance obligations. Planning for these cost pressures helps protect margins.

Additionally, businesses tendering for public sector contracts in these states should anticipate sustainability criteria in procurement. State governments implementing low-carbon fuel standards often extend decarbonisation expectations to their supply chains. Demonstrating fuel efficiency or low-carbon transport options may become a competitive advantage in bidding processes.

For businesses considering US market entry or expansion, these programmes signal the direction of state-level environmental regulation. Low-carbon fuel standards are expanding geographically. Therefore, businesses should factor potential compliance costs into location decisions and investment planning. States without programmes today may introduce them within the next five to ten years.

Long-term policy trajectory beyond the West Coast

The expansion of low-carbon fuel standards to New Mexico and potentially Hawaii indicates a broader shift in US climate policy. These programmes are no longer confined to the Pacific Coast states that pioneered them. Consequently, businesses should expect similar policies to emerge in other states over time.

Several factors drive this expansion. First, electric vehicle adoption is creating demand for policy frameworks that account for electricity as a transportation fuel. Low-carbon fuel standards provide this framework by treating electricity carbon intensity alongside liquid fuels. Second, states seeking decarbonisation pathways find these programmes attractive because they operate through market mechanisms rather than direct mandates.

However, implementation challenges remain. States with different fuel supply chains must adapt the model to local conditions. Credit market liquidity depends on sufficient participation. Therefore, smaller states may struggle to create functioning markets without regional coordination. Multi-state compacts or credit trading agreements could address this issue.

For UK businesses, the key takeaway is that US fuel regulation is fragmenting along state lines. Federal standards remain limited. Consequently, companies operating across multiple states face a patchwork of requirements. This mirrors the regulatory complexity UK businesses already navigate in Europe, where member states implement EU directives with national variations.

Understanding these dynamics helps businesses anticipate where compliance obligations may emerge next. States with ambitious climate commitments, particularly in the Northeast and Mid-Atlantic regions, are likely candidates for future low-carbon fuel programmes. Monitoring legislative developments in these areas allows businesses to prepare before requirements take effect.

Where to find detailed programme guidance

New Mexico’s Environment Department publishes official guidance on the Clean Transportation Fuel Program. The department’s website includes compliance timelines, carbon intensity calculations, and credit trading procedures. Businesses operating in New Mexico should consult these resources directly for current requirements.

Hawaii’s state energy office provides updates on clean fuel legislation as it progresses through the legislative process. However, because the programme is not yet enacted, official guidance remains subject to change. Businesses planning Hawaii operations should monitor legislative developments through the state energy office’s website.

The Low Carbon Fuels Coalition tracks state-level clean fuel legislation across the United States. Their website provides comparative analysis of different state programmes and legislative updates. This resource helps businesses understand how programmes differ and where new policies may emerge.

For businesses seeking technical detail on carbon intensity calculation methodologies, California’s Air Resources Board publishes extensive documentation on its low-carbon fuel standard. While California’s programme differs from New Mexico’s and Hawaii’s proposals, the underlying technical frameworks share common elements. Therefore, California’s resources provide useful background on how these programmes function in practice.