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As workers continue to comb beaches for tar balls in California’s Orange County after an underwater pipeline ruptured on Oct. 2, another massive fossil fuel cleanup operation is just getting underway on a 55-year-old rig anchored 120 miles up the coast. It’s a taxpayer-funded, $60 million debacle that reveals just how difficult and costly it may be to shut down aging oil rigs in the Pacific Ocean and decarbonize the country’s energy supply.

Anchored two miles off Santa Barbara, the rig in question, known as Platform Holly, was built by ARCO in 1966, sold to Mobil in 1993, then sold again to a small Colorado-based oil company called Venoco in 1997. In 2015, a corroded onshore pipeline carrying crude oil from Holly and other nearby platforms burst, hemorrhaging oil onto the beach and into the Pacific Ocean. With the pipeline shuttered, Venoco declared bankruptcy in 2017, abruptly notifying California authorities that it would be abandoning its lease and letting its rig workers walk off the job. Faced with the risk of another leak from the abandoned rig, the California State Lands Commission had no choice but to take over the platform.

The situation turned out to be even worse than it seemed. A $22 million bond Venoco previously put up—essentially a security deposit intended to cover the costs of exactly this situation—was only enough to fund just 6% of the approximately $360 million needed to plug Holly’s 30 oil wells and properly decommission the rig. Venoco wasn’t “managing maintenance the way they should have” during Holly’s last years of operation, according to Seth Blackmon, chief counsel of the California State Lands Commission, which meant that pressurized gases and oil were leaking into an outer containment zone around the platform’s wells. The state was forced to continuously pipe a mixture of seawater, crude oil, and highly poisonous hydrogen sulfide gas from the leaking wells to Venoco’s onshore processing facility, which separates the components and incinerates the hydrogen sulfide. ExxonMobil, Holly’s previous owner, agreed to shoulder the cost of plugging the wells and decommissioning the structure, which would cost about $300 million, but the additional price of continuously off-gassing Holly’s hydrogen sulfide, running the processing facility and maintaining the half-century-old oil platform in a safe condition until it could be decommissioned fell onto the state.

That decommissioning work, which began in late 2019, was paused for a year and a half due to COVID-19; work capping the wells restarted only last week. In the meantime, California paid between $750,000 and $1 million every month to maintain Platform Holly and deal with its poisonous emissions, a cost that, since 2017, has added up to $64 million. The State Lands Commission expects to finish plugging all 30 of Holly’s wells within the next 16 months, according to Jennifer Lucchesi, the agency’s executive officer, but further delays are possible—and the state will pay an additional $1.5 million a month while the work is underway.

Platform Holly’s long-running shutdown fiasco was put into sharp relief this week, after tens of thousands of gallons of oil spilled from a fractured underwater pipeline off the coast of Orange County. The spill, which has shuttered beaches and caused untold ecological damage, has reinvigorated calls to remove oil infrastructure from California’s coasts. “It’s time, once and for all, to disabuse ourselves that this has to be part of our future,” California governor Gavin Newsom said at an Oct. 5 news conference.