Oregon does not have a carbon tax passed by the legislature. What the state has instead is the Climate Protection Program, a cap-and-reduce rule adopted by the Department of Environmental Quality that limits greenhouse gas emissions from fuel suppliers and natural gas utilities. The program itself charges consumers nothing directly, but the compliance costs it imposes on fuel companies and gas utilities flow downstream to pump prices and monthly gas bills, which is why many Oregonians experience it as a carbon tax even though no such tax exists in statute.1Oregon Department of Environmental Quality. Climate Protection Program
What It Adds to Fuel and Gas Bills
DEQ’s own macroeconomic analysis estimated the program could add roughly $0.09 to $0.39 per gallon to diesel between 2025 and 2035, and $0.10 to $0.36 per gallon to gasoline between 2025 and 2050.2Oregon Department of Environmental Quality. Macroeconomic Impact Analysis – Climate Protection Program The ranges are wide because the actual pass-through depends on how aggressively the cap tightens each year and how quickly cleaner fuel alternatives become available. Fuel distributors have reported that the compliance cost added at the wholesale rack can swing from near zero to over $0.50 per gallon depending on market conditions in a given year.
Natural gas customers see the cost more directly. NW Natural, the state’s largest natural gas utility, reports that the credits it buys to comply function as a per-ton fee collected from customers at $136 per ton of carbon, compared to roughly $65 per ton in Washington and $28 per ton in California.3NW Natural. 2026 Customer Message Oregon’s per-ton cost is higher than its West Coast neighbors’ carbon markets, which has driven a good deal of the political argument over the program.
Why There’s a Cost at All
The program caps total emissions from covered fuel sources and shrinks that cap every year, aiming for a 50% reduction by 2035 and a 90% reduction by 2050.1Oregon Department of Environmental Quality. Climate Protection Program Each year DEQ issues a fixed number of compliance instruments equal to that year’s cap, with each instrument representing one metric ton of carbon dioxide equivalent. Fuel suppliers receive instruments based on a three-year rolling average of their historical emissions, and natural gas utilities receive a fixed allocation that declines annually.4Oregon Department of Environmental Quality. Climate 2023 Rulemaking Brief
As the cap shrinks, covered companies that can’t cut emissions fast enough have to find instruments elsewhere, either by trading with other regulated entities or by buying Community Climate Investment credits. That tightening is where the consumer cost comes from.
Community Climate Investment Credits
CCI credits are payments to state-authorized nonprofits that fund emission-reduction projects in communities disproportionately affected by climate change, such as EV charging in underserved areas, weatherization for low-income housing, or clean energy installations. DEQ sets the CCI contribution rate and adjusts it periodically. The rate effective March 1, 2026 through February 28, 2027 is $136 per metric ton of CO2 equivalent, the same figure NW Natural passes to customers.5Oregon Department of Environmental Quality. Community Climate Investment Contribution Amount
Companies cannot cover their whole obligation this way. During the first compliance period, which runs from 2025 through 2027, CCI credits can cover no more than 15% of a regulated entity’s total obligation. That cap rises to 20% starting with the second compliance period in 2028.6International Carbon Action Partnership. Oregon Reinstates Emissions Trading Program
Who Is Actually Regulated
The program covers three groups, and knowing which one is behind a given cost helps explain where it shows up.
Liquid fuel and propane suppliers are covered once their annual emissions from fuel sold in Oregon hit a threshold that drops over time. It started at 200,000 metric tons of CO2 equivalent, fell to 100,000 metric tons in 2025, and is scheduled to reach 25,000 metric tons in later years.7Oregon Department of Environmental Quality. Climate Protection Program – Covered Entities Covered emissions include the carbon released when the fuel is eventually burned, so the supplier is on the hook for the downstream combustion of every gallon it sells in Oregon.
Natural gas utilities that distribute to homes and businesses are covered regardless of tonnage. Oregon’s three major gas utilities each receive declining allocations from DEQ.4Oregon Department of Environmental Quality. Climate 2023 Rulemaking Brief
Emission-intensive, trade-exposed industrial facilities and direct natural gas sources at or above 15,000 metric tons of CO2 equivalent per year are also within the program’s scope, but they are exempt from compliance obligations during the first compliance period ending in 2027. DEQ plans separate rulemaking to set sector-specific carbon intensity targets before the second compliance period begins in 2028.8Oregon Department of Environmental Quality. Climate Protection Program
Current Legal Status
If you heard the program had been thrown out, that was true for a time. The Oregon Court of Appeals struck down the original 2021 rules in December 2023, ruling that DEQ had failed to meet public disclosure requirements under the federal Clean Air Act. The Environmental Quality Commission went back to work and formally reinstated the program with revised rules on November 21, 2024.6International Carbon Action Partnership. Oregon Reinstates Emissions Trading Program The reinstated version expanded coverage to include certain industrial facilities and reset the compliance timeline. The first compliance period under the current rules started January 1, 2025 and runs through the end of 2027.8Oregon Department of Environmental Quality. Climate Protection Program The rules themselves sit in Oregon Administrative Rules Chapter 340, Division 271.9Legal Information Institute. Oregon Administrative Code 340-271-0010 – Purpose and Scope
What’s Not Covered
Not every fuel sold in Oregon counts toward the cap. Aviation fuels are excluded from a supplier’s covered emissions, reflecting the practical difficulty of regulating aircraft that cross state and national lines. Marine fuel, by contrast, is not exempt; DEQ’s guidance explicitly includes fuels used in marine transport within Oregon.10Oregon Department of Environmental Quality. Climate Protection Program – Covered Entity FAQ Biomass-derived fuels are also excluded from covered emissions calculations, and smaller fuel distributors whose annual covered emissions fall below the threshold are not subject to the cap-and-reduce requirements at all.11International Carbon Action Partnership. USA – Oregon – Climate Protection Program (CPP)
There is also no consumer-level carbon tax to file, report, or pay directly. If you’re a household or a small business in Oregon, you don’t owe anything to DEQ under this program. What you pay shows up inside the price of gasoline, diesel, and natural gas, set by the suppliers and utilities working to stay within their shrinking allocations.