More than 280 families have fled their homes in Porter Ranch in the San Fernando Valley, sickened by the smell of a voluminous natural gas leak from underground storage wells. The gas has been seeping from the ground for more than a month, yet Southern California Gas Co. says it might to take another three to four months to shut down the well, which goes 8,500 feet deep.
In the meantime, county health officials have ordered the company to temporarily relocate residents affected by the rotten egg smell of mercaptan, which is added to otherwise odorless natural gas to alert people to leaks, but which can cause nausea, headaches and dizziness. County and city officials have also called on Gov. Jerry Brown and state agencies to investigate the cause of the leak and how to expedite the repair.
But the damage goes far beyond the immediate neighbors. The leak has released a huge amount of methane, the primary component of natural gas and a potent heat-trapping compound that can hasten climate change. State air quality regulators estimate the leak is equivalent to 25% of the state’s daily methane emissions and has roughly the same effect as driving 160,000 cars for a year.
Such a major release is especially worrisome because in the short-term — say, 20 years — methane has 80 times the warming effect of carbon. Although it doesn’t remain in the atmosphere as long as carbon dioxide, methane captures heat far more effectively. It accounts for about 10% of all U.S. greenhouse gas emissions from human activities, with the major sources in California being cattle farms, landfills and leaky gas pipes.
Now, one natural gas leak from the company’s storage facility could reverse some of the emissions reductions that California has made in recent years as it has cut the state’s reliance on coal-fired power plants, invested in electric vehicles and installed solar panels. Just as the 2010 fatal explosion in San Bruno was a wake-up call on the need for greater safety oversight of natural gas pipelines, the Porter Ranch leak is a stark reminder that California must also step up its oversight of natural gas storage facilities. These operations can have a huge impact not only on neighbors but on the state’s ability to combat climate change.