California's Oil Refineries

California's refineries are located in the San Francisco Bay area, Los Angeles area and the Central Valley. Each day approximately two million barrels (a barrel is equal to 42 U.S. gallons) of petroleum are processed into a variety of products, with gasoline representing about half of the total product volume. (A list of refineries, their location and capacity is shown in the table below.)

Refineries can be classified as topping, hydroskimming or complex. Topping refineries are the least sophisticated and contain only the atmospheric distillation tower and possibly a vacuum distillation tower. The topping refiner's ability to produce finished products depends on the quality of the petroleum being processed. A hydroskimming refinery has reforming and desulfurization process units in addition to basic topping units. This allows the refiner to increase the octane levels of motor gasoline and reduce the sulfur content of diesel fuel. Complex refineries are the most sophisticated refinery type and have additional process units to "crack" the heavy gas oils and distillate oils into lighter, more valuable products.

Using a variety of processes including distillation, reforming, hydrocracking, catalytic cracking, coking, alkylation and blending, the refinery produces many different products. The four basic groups are motor gasolines, aviation fuel, distillate fuel and residual fuel. On a statewide average, about 12 percent of the product from California's refineries is aviation fuel, 13 percent is distillate fuel and 9 percent is residual fuel.

Complex refineries have the highest utilization rate at approximately 95 percent. Utilization rate is the ratio of barrels input to the refinery to the operating capacity of the refinery. Complex refineries are able to produce a greater proportion of light products, such as gasoline, and operate near capacity because of California's large demand for gasoline. Permitting Issues. It is unlikely that new refineries will be built in California. In fact, from 1985 to 1995, 10 California refineries closed, resulting in a 20 percent reduction in refining capacity. Further refinery closures are expected for small refineries with capacities of less than 50,000 barrels per day. The cost of complying with environmental regulations and low product prices will continue to make it difficult to continue operating older, less efficient refineries.

To comply with federal and state regulations, California refiners invested approximately $5.8 billion to upgrade their facilities to produce cleaner fuels, including reformulated gasoline and low-sulfur diesel fuel. These upgrades received permits since low-sulfur diesel fuel regulations went into effect in 1993. Requirements to produce federal reformulated gasoline took effect at the beginning of 1995, and more stringent state requirements for CARB reformulated gasoline went into effect statewide on April 1, 1996. That requirement was removed by Governor Gray Davis when it was found that the oxygenate, methyl tertiary butyl-ether or MTBE, was leaking from some underground storage tanks and polluting water supplies. MTBE was phased out and removed as of December 31, 2003, and replaced by ethanol.

For information about oil production and imports to refineries, please see Petroleum Data, Facts, and Statistics.

Refineries Outside of California That Can Produce California Gasoline

Domestic sources include refineries located in Washington State and the US Gulf Coast. Foreign sources include Eastern Canada, Finland, Germany, US Virgin Islands, Middle East, and Asia.

California Refineries

California Oil Refinery Locations and Capacities
Refinery Name Barrels Per Day CARB Diesel CARB Gasoline
Marathon Petroleum Corp., Carson Refinery*363,000YesYes
Chevron U.S.A. Inc., El Segundo Refinery269,000YesYes
Chevron U.S.A. Inc., Richmond Refinery245,271YesYes
Marathon Petroleum Corp., Golden Eagle Martinez Refinery161,500YesYes
PBF Energy, Torrance Refinery160,000YesYes
Shell Oil Products US, Martinez Refinery156,400YesYes
Valero Energy, Benicia Refinery145,000YesYes
Phillips 66, Wilmington Refinery139,000YesYes
Phillips 66, Rodeo San Francisco Refinery**120,200YesYes
Valero Energy, Wilmington Refinery85,000YesYes
Kern Oil & Refining Company, Bakersfield Refinery26,000YesYes
San Joaquin Refining Company Inc., Bakersfield Refinery15,000YesNo
Greka Energy, Santa Maria Refinery9,500NoNo
Lunday Thagard, South Gate Refinery8,500NoNo
Valero Wilmington Asphalt Refinery6,300NoNo

*Marathon Carson and Wilmington began reporting as one entity as of 2019.

** Phillips 66 Rodeo and Santa Maria began reporting as one entity as of 2017.

Note: Data on this table represents total crude oil capacity not gasoline, distillate production, diesel fuel production or production of other products. Production potential varies depending on time of year and status of the refinery. A rule of thumb is that roughly 50 percent of total capacity is gasoline production (about 1.0 million barrels of gasoline - 42 million gallons - is produced per day). Data as of January 1, 2019.

Source: U.S. Energy Information Administration, California Energy Commission Transportation Fuels Data.

Terminal Facilities

California's nearly 100 terminals receive petroleum and petroleum products by tanker, barge, pipeline, rail or truck. Most of California's terminals are marine terminals. At these facilities petroleum or product is transferred from or to tankers or barges. Tankers loaded with Alaska North Slope petroleum, for example, enter marine terminals in northern and southern California, where the crude oil is then sent to refineries by pipeline for processing. An example of pipeline receipts of petroleum at a terminal is heavy California petroleum produced in the Bakersfield area that is sent by pipeline to a refinery at Martinez.

Terminals also serve as refiner's wholesale distribution points for products. Product, such as gasoline, is sold to distributors (jobbers) who then sell to consumers through the distributors' own retail stations. The distributor may also resell the gasoline to other station dealers. Gasoline can also be sold directly to station dealers from the terminal. The marketing structure differs depending on the type of product being sold.

A terminal can be linked with several refineries and storage facilities and be supplied by privately-owned pipelines or a common carrier line. Total capacity at a terminal can range from a few thousand barrels to a few million barrels. The most apparent equipment at a terminal are the tanks used for storage and separation of different product grades. The number of tanks can range from a few to more than 70. Other equipment found includes piping, pumps, valves, and meters needed for bulk receipts and for loading racks used for small deliveries to trucks. Marine terminals have vessel length and water depth limits that dictate the size of tankers that can off-load at the facility.

Permitting Issues. Some of the environmental and safety issues associated with permitting petroleum and petroleum product terminals include:


  1. U.S. Petroleum Refining, Meeting Requirements for Cleaner Fuels and Refineries, Volume I, National Petroleum Council, August, 1993. This document is a comprehensive assessment of how environmental regulations impact the petroleum refining industry and U.S. consumers.
  2. Fuels Report, California Energy Commission, December, 1995, Publication No. P300-95-017. The Fuels Report describes emerging trends and long range forecasts of the demand, supply and price of petroleum, petroleum products, natural gas, coal and synthetic and other fuels. It is the state's principal fuels policy document.
  3. Petroleum Industry Information Reporting Act submittals from the petroleum industry to the California Energy Commission.
  4. Quarterly Oil Report, Fourth Quarter 1993, April 1994, California Energy Commission, Publication No. P300-94-003. This report describes petroleum fuels market trends, price trends, refinery activity, oil production trends and petroleum company financial performance. It contains aggregated petroleum statistics for California based on industry submittals to the Commission including refinery utilization rates.
  5. 1994 Annual Report, Western States Petroleum Association.


Refinery list - California Energy Commission staff, updated regularly.

Background information and discussion - Energy Aware Planning Guide II: Energy Facilities, California Energy Commission, Publication No. 700-96-006, December 1996, Appendices B-24 and