SOx Emission Reduction Credits in California
Research recorded prices and district certificate records. Ask the Exchange to confirm current availability and obtain seller quotes.
Why SOx credits matter
SOx demand is thinner than NOx or ROG, and SOx volumes often trade as add-ons to a larger deal, but recorded 2022 sales ran as high as $20,000/ton in the Bay Area.
What SOx ERCs sold for, recorded 2023 prices (CARB)
| District | Median $/ton | Low | High |
|---|---|---|---|
| Yolo-Solano AQMD | $17,000 | $17,000 | $17,000 |
Source: CARB 2023 ERC transaction report; 2022 and South Coast 2024 tables on the prices page. Yolo-Solano's own transaction history (1998–2024) shows SOx clearing $500–$17,000/ton across 30 recorded transactions.
Districts with banked SOx credits on the Exchange
Published register entries reporting SOx volumes, by district. These records do not confirm current seller availability:
Search banked SOx ERC records Request SOx credits privately
Request a current SOx quote
Provide the project district, required quantity, units, quarterly requirements if applicable, and permit deadline. We compare the credit price, minimum purchase, seller fees, district transfer charges and agreed brokerage compensation. A smaller quantity can cost more per ton when fixed charges apply. Historical prices are context, not a current offer.
Buy or sell SOx ERCs
Eligibility for SOx credits depends on the project and district rules. Some interdistrict uses are possible with required approvals under Health & Safety Code §40709.6. Tell us the district and tonnage your permit requires and we research district records and request quotes from holders or their representatives. Initial inquiries are free. Brokerage services and compensation are agreed in writing. Holders list free and set their own asking price.