HB1304 would direct the Hawaii Department of Transportation to adopt rules establishing a statewide clean fuel standard for transportation fuels. The bill is built around reducing the lifecycle carbon intensity of fuels used in the state, with a phased schedule that would require average carbon intensity reductions of at least 10% below 2019 levels by 2035 and 50% below 2019 levels by 2045. It also sets an implementation date for diesel and gasoline standards on or before January 1, 2027, and requires the department to use lifecycle emissions accounting, including the Argonne National Laboratory GREET model, to measure emissions from fuel production, transport, and use.
The bill creates a credit-and-deficit compliance framework under which lower-carbon fuels generate credits and higher-carbon fuels generate deficits. It covers gasoline, diesel, and a broad range of alternative fuels such as ethanol, renewable diesel, sustainable aviation fuel, electricity, biomethane, renewable natural gas, hydrogen, and fuels from carbon capture and utilization. The department would also be required to establish verification procedures, export-retirement rules, periodic model updates, and exemptions for certain sectors such as aviation, rail, military vehicles, and interstate waterborne vessels. The bill further allows, but does not require, additional features such as cost containment, credit trading and banking, opt-in provisions for exempt sectors and off-road uses, and linkage with similar programs in California, Oregon, and Washington.
If enacted, HB1304 would amend Hawaii transportation policy by creating a new regulatory program rather than directly imposing statutory fuel mandates. It would give the Department of Transportation broad rulemaking authority to define compliance standards, credit generation, exemptions, and program administration, while also potentially affecting fuel suppliers, utilities, alternative fuel producers, and transportation users across the state. The bill’s definitions would also formally recognize lifecycle greenhouse gas emissions and carbon intensity as core regulatory concepts in state transportation law.
The overall sentiment reflected in the bill text is strongly supportive of decarbonization, economic development, and public health benefits. The findings emphasize climate goals, job creation, circular economy opportunities, and alignment with successful programs in other western states. No committee transcripts or recorded votes were provided, so there is no direct evidence of opposition or support from legislators in the available context.
The main points of potential contention are likely to be the compliance costs, the pace of implementation, and the breadth of the program’s reach across fuel types and sectors. The bill’s use of a market-based credit system, possible linkage to other states’ programs, and discretionary provisions for cost containment and exemptions suggest anticipated concerns about administrative complexity, fuel price impacts, and treatment of aviation, marine, rail, military, and small-volume fuel users.
HB1304 would require the Hawaii Department of Transportation to adopt a new clean fuel standard under chapter 91 rulemaking authority, creating a statewide regulatory framework for measuring and reducing the carbon intensity of transportation fuels. It would affect fuel suppliers and users by establishing credit and deficit accounting, lifecycle emissions methodology, exemptions, and potential trading/banking mechanisms, while also opening the door to future integration with clean fuel programs in other states.
The bill is framed in strongly favorable terms toward climate policy, clean energy, and economic development, with legislative findings emphasizing emissions reductions, public health, and job creation. Because no committee discussion or vote history was provided, the available record shows no explicit opposition or amendment debate, but the structure of the bill suggests it anticipates stakeholder concerns about implementation and compliance flexibility.
Likely areas of contention include the cost and administrative burden of implementing a clean fuel standard, the required timeline for diesel and gasoline standards, and how aggressively the state should reduce carbon intensity. Additional debate may arise over exemptions for aviation, rail, military, and marine uses, whether utilities and energy producers should be allowed to generate credits, and whether Hawaii should link its program to California, Oregon, and Washington or rely on their approved carbon-intensity pathways. The bill’s broad rulemaking delegation and open-ended percentage placeholders for infrastructure support could also draw scrutiny.