AB 1849 requires the State Air Resources Board (CARB) to complete by December 31, 2027 an assessment of how much decarbonized gaseous fuel California will need to decarbonize hard-to-electrify sectors and to maintain electricity reliability. The assessment must be sector‑specific, evaluate electricity reliability needs, recommend policies and incentives, and examine opportunities to use agricultural and forest residues.
The bill does two practical things: it forces a statewide demand and supply accounting exercise for decarbonized gaseous fuels, and it establishes policy constraints for whatever CARB recommends — specifically performance‑based, technology‑neutral measures that use life‑cycle carbon intensity metrics and provide Cap‑and‑Invest compliance relief proportional to purchases of decarbonized gas. That framework will shape future incentives, procurement, and compliance mechanisms affecting producers, utilities, regulated emitters, and resource managers.
At a Glance
What It Does
The bill directs CARB to produce an assessment by December 31, 2027 estimating demand for decarbonized gaseous fuels by hard‑to‑electrify sectors and for electricity reliability, and to recommend policies and incentives to accelerate production and use. The bill requires recommendations to be performance‑based, technology‑neutral, and to base performance on life‑cycle carbon intensity; it also calls for Cap‑and‑Invest compliance relief tied to purchases of decarbonized gas.
Who It Affects
Primary stakeholders include producers of decarbonized hydrogen and low‑carbon biogas, utilities and grid operators planning reliability resources, industries in hard‑to‑electrify sectors (e.g., heavy industry, aviation, shipping), entities covered by California's Cap‑and‑Invest program, and agricultural and forestry managers supplying residues.
Why It Matters
The assessment will inform state policy and incentives that can scale in‑state production and shape market demand, while the performance‑based and lifecycle metric requirements set an early standard for how decarbonized gas will be validated and credited across regulatory programs.
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What This Bill Actually Does
AB 1849 tasks the State Air Resources Board with a timed, evidence‑based estimate of how much decarbonized gaseous fuel California will need. CARB must look across sectors that are difficult to electrify — think high‑temperature industrial heat, certain freight modes, aviation and marine uses — and separately quantify the contribution decarbonized gas might make to electricity system reliability.
The bill does not define specific procurement targets; it requires an assessment and policy recommendations to guide future decisions.
When preparing recommendations, CARB must adopt a set of design principles rather than prescribe specific technologies. The bill requires policies and incentives to be performance‑based and technology‑neutral, and it mandates that the performance yardstick is a life‑cycle carbon intensity metric aligned with measurements used in the electricity and transportation fuels sectors.
This pushes CARB to focus on outcomes (net emissions) rather than favoring particular production methods (for example, electrolysis vs. fossil gas with CCS) in its advice.A consequential operational requirement is that CARB address compliance interactions with California's Cap‑and‑Invest program: the board must ensure regulated entities receive reduced obligations commensurate with purchases of decarbonized gas. That clause signals a likely path toward market instruments or crediting mechanisms tied to fuel purchases — mechanisms that will need careful accounting to avoid double counting or erosion of the cap’s integrity.The bill also asks CARB to assess feedstock opportunities, specifically agricultural and forest residues, and to consider delivery policies that ensure decarbonized gases actually displace fossil fuels in‑state.
CARB must weigh co‑benefits such as wildfire risk reduction, reduced pile burning, landfill diversion, avoided curtailment of renewable power, and local economic impacts. Those broader considerations will push the assessment beyond pure volumetric demand to include supply‑chain and land‑use implications.
The Five Things You Need to Know
CARB must complete an assessment by December 31, 2027 estimating the quantity of decarbonized gaseous fuels needed for both hard‑to‑electrify sectors and electricity reliability.
The assessment must be sector‑specific and include an analysis of opportunities to use agricultural and forest residues as feedstocks for decarbonized fuels.
Recommendations must be performance‑based and technology‑neutral, using a life‑cycle carbon intensity metric consistent with the electricity and transportation fuel sectors.
The bill requires that entities regulated under California’s Cap‑and‑Invest program receive a reduced compliance obligation commensurate with their purchases of decarbonized gas.
CARB must consider delivery requirements or other policies to ensure decarbonized gases displace fossil fuel use in California and to maximize co‑benefits such as wildfire mitigation, reduced landfill waste, and job creation.
Section-by-Section Breakdown
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Legislative findings on need and intent
This section collects legislative findings: California has made progress on renewable electricity but limited progress in decarbonizing hard‑to‑electrify sectors and reducing natural gas for power; the state needs increased production and use of decarbonized hydrogen and bioenergy; and expanding low‑carbon gas can bring co‑benefits such as reduced air and water pollution and wildfire mitigation. Practically, these findings set the policy frame CARB must work within — prioritizing both statewide climate goals and local co‑benefits when designing recommendations.
Assessment duties and scope
Subdivision (a) mandates the December 31, 2027 deadline for CARB's assessment and specifies four discrete elements: sectoral demand estimates, electricity reliability needs, recommended policies and incentives, and evaluation of agricultural and forest residue opportunities. That structure requires CARB to produce an integrated demand‑and‑supply picture rather than separate technical memos: the agency must quantify volumes, identify where decarbonized gas could be used, and link those estimates to concrete policy options.
Design guardrails: performance‑based, tech‑neutral, life‑cycle metric
Subdivision (b) imposes three design constraints on CARB's recommendations: policies must be performance‑based and technology‑neutral; performance must be measured by life‑cycle carbon intensity consistent with electricity and transport rules; and regulated Cap‑and‑Invest entities must receive lesser obligations proportional to purchases. These are prescriptive guardrails: they limit CARB’s discretion to recommend prescriptive technology mandates and push the agency toward market‑oriented, outcome‑focused mechanisms tied to life‑cycle accounting.
Considerations: in‑state production, co‑benefits, and delivery
Subdivision (c) instructs CARB to weigh how to incentivize in‑state production, maximize co‑benefits (wildfire mitigation, reduced pile burning, landfill diversion, use of curtailed renewable power, job creation), and to recommend delivery or other policies ensuring in‑state displacement of fossil fuels. This pushes the assessment to address supply‑chain, geographic, and infrastructure issues — for example, whether and how new pipeline or fueling infrastructure, transportation logistics, or procurement rules should be part of policy recommendations.
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Explore Energy in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Producers of decarbonized hydrogen and low‑carbon biogas: The assessment and subsequent policy recommendations will likely create demand signals and justify incentives or procurement programs that expand markets for in‑state producers.
- Hard‑to‑electrify sectors (e.g., heavy industry, aviation, shipping, certain freight): The bill seeks pathways to deliver low‑carbon gaseous fuels that can decarbonize processes where electrification is infeasible or uneconomic.
- Grid operators and utilities: By requiring an analysis of reliability needs, the bill opens the door to defining decarbonized gas as an eligible reliability resource, informing capacity planning and procurement options.
- Agricultural and forestry managers and rural economies: The explicit focus on residues can generate new revenue streams for residue collection and processing, with potential local job creation and economic development.
- Communities affected by diesel and other fossil emissions: If decarbonized gases displace diesel backup generators and reduce reliance on fossil fuels, local air quality and public health could improve.
Who Bears the Cost
- CARB (State Air Resources Board): The agency will bear the administrative and technical burden of producing a comprehensive, sector‑specific assessment within the statutory timeline, including setting or aligning lifecycle accounting methods.
- Fossil fuel infrastructure owners and natural gas utilities: Delivery requirements and in‑state displacement policies may impose retrofit, permitting, or operational costs and could reduce demand for traditional fossil supplies.
- Entities that purchase decarbonized gas but lack clear verification systems: Regulated firms receiving compliance relief will need robust accounting and contracting systems to document purchases, creating transaction and compliance costs.
- Landowners and resource managers supplying residues: Collecting, transporting, and processing agricultural and forest residues at scale requires capital and operational investments; there is also potential opportunity cost compared with current uses or ecological management.
- Ratepayers or taxpayers if incentives are funded publicly: Any subsidies, procurement programs, or infrastructure buildouts implied by CARB's recommendations could be funded through rate adjustments, bond measures, or budget allocations.
Key Issues
The Core Tension
The central dilemma is this: accelerate production and use of decarbonized gaseous fuels to decarbonize sectors where electrification is impractical, while ensuring that the fuels actually deliver genuine, verifiable lifecycle greenhouse gas reductions and do not create new local or ecological harms or undermine the integrity of the Cap‑and‑Invest program.
The bill sets guardrails but leaves critical definitional and accounting work to CARB. The life‑cycle carbon intensity metric requirement is sensible in principle but technically demanding: CARB must reconcile methodologies used across electricity and transport sectors, decide system boundaries (feedstock emissions, land‑use change, upstream methane), and set verification protocols.
Those choices materially affect which production pathways qualify as “decarbonized” and how much compliance relief a purchasing entity receives.
Crediting purchases against Cap‑and‑Invest obligations creates an integrity risk if not tightly scoped. Without clear rules on additionality, ownership of emissions reductions, and double‑counting prevention, credits tied to fuel purchases could weaken the cap’s environmental outcome.
Similarly, promoting residue‑derived fuels raises trade‑offs: removing residues can reduce wildfire risk and landfill methane but may also harm soils, biodiversity, and long‑term forest health if extraction is unmanaged. Finally, delivery‑focused policies (e.g., guaranteed in‑state displacement) implicate infrastructure, permitting, and potentially disproportionate local impacts — outcomes that require coordination across multiple agencies and stakeholders.
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