Marathon Los Angeles Refinery (Carson)
Large load · 2350 E. 223rd Street, Carson, CA
The Marathon Los Angeles Refinery in Carson, California, is an integrated Carson and Wilmington refining complex owned by Tesoro Refining & Marketing Company LLC, a Marathon Petroleum subsidiary. The Watson Cogeneration Unit on site can produce a maximum of 420 MW.
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Overview
The Carson and Wilmington Operations began operating independently in 1923 and are now fully integrated. In January 2026 Marathon briefly suspended operations at the 365,000-bpd refinery, and in October 2026 a hydrocracker was shut for planned work.
Profile
- Electricity and grid
- The Carson Watson Cogeneration Unit can currently produce a maximum of 420 MW of electricity. The AQMD review says proposed projects will rely on existing onsite power and steam generated at the Watson unit, and that Wilmington modernization projects require up to seven MW of additional electricity. Watson power is sold to Southern California Edison over a high-voltage line, and a 2008 plan described refinery peak demand of approximately 63 MW.
- Ownership and permits
- Tesoro Refining & Marketing Company LLC, doing business as Marathon Los Angeles Refinery, owns and operates the refinery and is a wholly owned subsidiary of Marathon Petroleum Corporation. The refinery operates under three Title V permits.
Facility
- Activity
- Integrated Carson and Wilmington refining operations
- Industry
- Industrial
- Site type
- Campus
- Operating status
- Operating
Reported Jan 7, 2026
Permits and agreements
- Permit
- three Title V Permits to Operate
- Agreement
- CHP PPA, Watson will operate for 7 years
Related records
Timeline
- May 21, 2015
- CPUC approves modified SCE CHP PPA with Watson
docs.cpuc.ca.gov
- Jan 7, 2026
- Marathon briefly suspends and resumes operations at the refinery
Marathon reports emergency flares at 365,000 bpd LA refinery
- Oct 22, 2026
- Hydrocracker shut for planned work
Marathon conducting hydrocracker work at Los Angeles refinery