{"id":24082,"date":"2025-10-23T10:09:14","date_gmt":"2025-10-23T14:09:14","guid":{"rendered":"https:\/\/blogs.edf.org\/energyexchange\/?p=24082"},"modified":"2025-10-23T10:43:52","modified_gmt":"2025-10-23T14:43:52","slug":"10-years-later-what-we-have-and-havent-learned-from-the-devastating-aliso-canyon-methane-leak","status":"publish","type":"post","link":"https:\/\/blogs.edf.org\/energyexchange\/2025\/10\/23\/10-years-later-what-we-have-and-havent-learned-from-the-devastating-aliso-canyon-methane-leak\/","title":{"rendered":"10 years later: What we have (and haven\u2019t) learned from the devastating Aliso Canyon methane leak"},"content":{"rendered":"<p><a href=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/\/aliso-blog-thumbnail.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-24085\" src=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/\/aliso-blog-thumbnail.jpg\" alt=\"\" width=\"624\" height=\"351\" srcset=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/aliso-blog-thumbnail.jpg 624w, https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/aliso-blog-thumbnail-300x169.jpg 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><\/a><\/p>\n<div id=\"message-list_1761229372.175569\" class=\"c-virtual_list__item\" tabindex=\"-1\" role=\"listitem\" aria-setsize=\"-1\" data-qa=\"virtual-list-item\" data-item-key=\"1761229372.175569\">\n<div class=\"c-message_kit__background p-message_pane_message__message c-message_kit__message\" role=\"presentation\" data-qa=\"message_container\" data-qa-unprocessed=\"false\" data-qa-placeholder=\"false\">\n<div class=\"c-message_kit__hover\" role=\"document\" aria-roledescription=\"message\" data-qa-hover=\"true\">\n<div class=\"c-message_kit__actions c-message_kit__actions--default\">\n<div class=\"c-message_kit__gutter\">\n<div class=\"c-message_kit__gutter__right\" role=\"presentation\" data-qa=\"message_content\">\n<div class=\"c-message_kit__blocks c-message_kit__blocks--rich_text\">\n<div class=\"c-message__message_blocks c-message__message_blocks--rich_text\" data-qa=\"message-text\">\n<div class=\"p-block_kit_renderer\" data-qa=\"block-kit-renderer\">\n<div class=\"p-block_kit_renderer__block_wrapper p-block_kit_renderer__block_wrapper--first\">\n<div class=\"p-rich_text_block\" dir=\"auto\">\n<ul class=\"p-rich_text_list p-rich_text_list__bullet p-rich_text_list--nested\" data-stringify-type=\"unordered-list\" data-list-tree=\"true\" data-indent=\"0\" data-border=\"0\">\n<li data-stringify-indent=\"0\" data-stringify-border=\"0\">Massive gas leak at Aliso Canyon storage site put a national spotlight on the dangers of methane pollution.<\/li>\n<li data-stringify-indent=\"0\" data-stringify-border=\"0\">10 years after the largest methane gas leak in U.S. history, national policies designed to limit methane pollution from certain oil and gas facilities are under attack.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"message-list_1761229381.624999\" class=\"c-virtual_list__item\" tabindex=\"0\" role=\"listitem\" aria-setsize=\"-1\" data-qa=\"virtual-list-item\" data-item-key=\"1761229381.624999\">\n<div class=\"c-message_kit__background p-message_pane_message__message c-message_kit__message\" role=\"presentation\" data-qa=\"message_container\" data-qa-unprocessed=\"false\" data-qa-placeholder=\"false\">\n<div class=\"c-message_kit__hover\" role=\"document\" aria-roledescription=\"message\" data-qa-hover=\"true\">\n<div class=\"c-message_kit__actions c-message_kit__actions--above\">\n<div class=\"c-message_kit__gutter\">\n<div class=\"c-message_kit__gutter__right\" role=\"presentation\" data-qa=\"message_content\">\n<div class=\"c-message_kit__blocks c-message_kit__blocks--rich_text\">\n<div class=\"c-message__message_blocks c-message__message_blocks--rich_text\" data-qa=\"message-text\">\n<div class=\"p-block_kit_renderer\" data-qa=\"block-kit-renderer\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><!--more--><\/p>\n<p><span style=\"font-weight: 400;\">This week marks the 10th anniversary of the Aliso Canyon methane leak \u2014 the largest natural gas leak in U.S. history that pumped more than 100,000 tonnes of the <\/span><a href=\"https:\/\/www.edf.org\/issue\/methane\"><span style=\"font-weight: 400;\">potent greenhouse gas methane<\/span><\/a><span style=\"font-weight: 400;\"> into the atmosphere. <\/span><a href=\"https:\/\/www.ecowatch.com\/erin-brockovich-porter-ranch-gas-leak-is-the-bp-oil-spill-on-land-1882167884.html\"><span style=\"font-weight: 400;\">Many have compared the resulting environmental damage to the catastrophic 2010 Deepwater Horizon oil spill<\/span><\/a><span style=\"font-weight: 400;\">. <\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">The leak occurred at an underground gas storage facility northwest of Los Angeles and went on for over 100 days before eventually being plugged. <\/span><a href=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/\/aliso-blog-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-24083\" src=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/\/aliso-blog-1.jpg\" alt=\"\" width=\"624\" height=\"351\" srcset=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/aliso-blog-1.jpg 624w, https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/aliso-blog-1-300x169.jpg 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">By that time, thousands of residents were displaced from their homes and reported experiencing severe nose bleeds, headaches and other health impacts. Studies on the longer term health impacts of the disaster are still ongoing, but<\/span><a href=\"https:\/\/www.uclahealth.org\/news\/release\/pregnant-women-living-near-aliso-canyon-gas-blowout-were\"><span style=\"font-weight: 400;\"> a recent study<\/span><\/a><span style=\"font-weight: 400;\"> indicated that pregnant women living near the facility were significantly more likely to have babies with low birth weight. Meanwhile the climate impact of the gas emitted during the leak is similar to that of a large European country\u2019s annual greenhouse gas emissions.\u00a0<\/span><\/p>\n<span class='bctt-click-to-tweet'><span class='bctt-ctt-text'><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fblogs.edf.org%2Fenergyexchange%2F2025%2F10%2F23%2F10-years-later-what-we-have-and-havent-learned-from-the-devastating-aliso-canyon-methane-leak%2F&#038;text=10%20years%20later%3A%20What%20we%20have%20%28and%20haven%E2%80%99t%29%20learned%20from%20the%20devastating%20Aliso%20Canyon%20methane%20leak&#038;via=EDFEnergyEx&#038;related=EDFEnergyEx' target='_blank'rel=\"noopener noreferrer\">10 years later: What we have (and haven\u2019t) learned from the devastating Aliso Canyon methane leak <\/a><\/span><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fblogs.edf.org%2Fenergyexchange%2F2025%2F10%2F23%2F10-years-later-what-we-have-and-havent-learned-from-the-devastating-aliso-canyon-methane-leak%2F&#038;text=10%20years%20later%3A%20What%20we%20have%20%28and%20haven%E2%80%99t%29%20learned%20from%20the%20devastating%20Aliso%20Canyon%20methane%20leak&#038;via=EDFEnergyEx&#038;related=EDFEnergyEx' target='_blank' class='bctt-ctt-btn'rel=\"noopener noreferrer\">Share on X<\/a><\/span>\n<p><a href=\"https:\/\/www.socalgas.com\/newsroom\/press-release\/socalgas-announces-agreements-to-resolve-aliso-canyon-litigation\"><span style=\"font-weight: 400;\">The gas company responsible for the leak ultimately agreed to pay out over $1 billion to settle lawsuits regulated to the damages.<\/span><\/a><span style=\"font-weight: 400;\"> The facility has remained in operation in order to meet the region\u2019s energy demands but with new regulations to help prevent another incident. Will it be enough?\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The leak exposed significant vulnerabilities in the way the United States\u2019 natural gas system is managed \u2014 drawing attention to both the impacts of mega leaks at storage facilities, as well as to the millions of smaller leaks occurring everyday across the entire natural gas supply chain.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So what has changed since the leak drew international attention to the methane problem?\u00a0<\/span><\/p>\n<p><b>New rules for gas storage, but largely on the industry\u2019s terms<\/b><\/p>\n<p><b><\/b><span style=\"font-weight: 400;\">The Aliso Canyon gas storage facility is not unique. It\u2019s one of 400 facilities across the country that store about half of the country\u2019s natural gas. For many years, there was effectively no federal oversight and only minimal state oversight of these facilities, which <\/span><a href=\"https:\/\/geokansas.ku.edu\/hutchinson-natural-gas-explosion\"><span style=\"font-weight: 400;\">has had fatal consequences<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<figure id=\"attachment_24084\" aria-describedby=\"caption-attachment-24084\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/\/aliso-blog-2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-24084\" src=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/\/aliso-blog-2.png\" alt=\"\" width=\"600\" height=\"390\" srcset=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/aliso-blog-2.png 600w, https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/aliso-blog-2-300x195.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><figcaption id=\"caption-attachment-24084\" class=\"wp-caption-text\">Source: PHMSA<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">The international attention generated by the Aliso Canyon gas leak triggered the Pipeline and Hazardous Materials Safety Administration to adopt new recommended practices, developed by industry, for gas storage sites in 2017. And in fact, earlier this month, PHMSA <\/span><a href=\"https:\/\/www.federalregister.gov\/documents\/2025\/07\/01\/2025-12069\/pipeline-safety-standards-update-api-rp-1170-and-api-rp-1171\"><span style=\"font-weight: 400;\">adopted <\/span><\/a><span style=\"font-weight: 400;\">industry\u2019s updated recommended practices for gas storage, which feature significantly improved risk management and emergency response planning \u2014 good news worth celebrating.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, because even these improved practices were originally written as voluntary industry best practices and not meant to act as regulation, they can be vague, ambiguous and difficult to enforce. And the recommended practices are not easily accessible since industry groups charge <\/span><a href=\"https:\/\/www.apiwebstore.org\/standards\/1170?__hstc=23321061.b89322bc79a7a31193fc846b62a5e3b4.1760977459529.1760977459529.1760977459529.1&amp;__hssc=23321061.1.1760977459530&amp;__hsfp=1702084950\"><span style=\"font-weight: 400;\">a fee<\/span><\/a><span style=\"font-weight: 400;\"> to view them online. PHMSA should make access to these recommended practices publicly available. And its critical that it develops and <\/span><i><span style=\"font-weight: 400;\">enforces <\/span><\/i><span style=\"font-weight: 400;\">more comprehensive regulations for gas storage facilities to reduce risks to our health and our environment.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Further, the underlying law giving PHMSA authority to oversee gas storage creates an arbitrary bifurcation in safety regulations. States have the ability to go beyond PHMSA standards for facilities that store gas for use in that state, but can\u2019t apply those same standards to a facility if that gas is sent elsewhere. There\u2019s essentially no difference in the operations of these interstate vs. intrastate facilities \u2014 they all can experience single points of failure leading to catastrophic blowouts. In fact there are some 17,000 wells that feed these storage sites and, as they age and corrode, many are at risk of failing. While it\u2019s good that there are improved federal guidelines for safer gas storage, it\u2019s clear we still need a more coherent plan for upgrading facilities and managing these long term risks. <\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">It\u2019s unclear whether any of that will happen anytime soon. Under the Trump Administration, PHMSA has been hemorrhaging staff. There are nearly 50 job vacancies in the department, including key experts and people at leadership levels, and enforcement actions have plummeted to record lows. Without staff and resources, it\u2019s highly unlikely the agency will be able to achieve its mission of protecting people and the environment from the risks associated with energy transport and storage. <\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><b>More scrutiny on methane \u2013 <\/b><b><i>for now<\/i><\/b><\/p>\n<p><span style=\"font-weight: 400;\">Since the leak, the U.S. Environmental Protection Agency has also <\/span><a href=\"https:\/\/blogs.edf.org\/energyexchange\/2023\/12\/12\/unpacking-epas-final-methane-protections\/\"><span style=\"font-weight: 400;\">made significant progress to limit leaks<\/span><\/a><span style=\"font-weight: 400;\"> at hundreds of thousands of oil and gas production sites across the country<\/span><span style=\"font-weight: 400;\">. Cumulatively, emissions from the oil and gas industry add millions of tons of methane and other toxic smog-forming and cancer-causing pollutants into the atmosphere each year. <\/span><a href=\"https:\/\/www.bu.edu\/sph\/news\/articles\/2023\/air-pollution-from-oil-and-gas-production-contributes-to-thousands-of-early-deaths-childhood-asthma-cases-nationwide\/\"><span style=\"font-weight: 400;\">Studies have revealed<\/span><\/a><span style=\"font-weight: 400;\"> that unchecked pollution from oil and gas facilities has caused thousands of premature deaths, asthma attacks and hospitalizations and are responsible for over $77 billion in annual health costs. Over the past decade, leaky equipment and other wasteful operations at oil and gas facilities have led to nearly 90 million metric tons of wasted gas. <\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">While some states have led on efforts to address oil and gas methane pollution (California, Colorado, New Mexico and Pennsylvania) many states have not yet adopted cost-effective practices that can reduce energy waste and save lives. And despite the known health and environmental impacts, as well as the massive waste of American energy resources, the Trump Administration is attempting to demolish these federal methane protections and has even said it will no longer track greenhouse gas emissions altogether.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Want to take action? The deadline to <\/span><a href=\"https:\/\/www.regulations.gov\/docket\/EPA-HQ-OAR-2025-0186\"><span style=\"font-weight: 400;\">provide public comments regarding proposed changes to the EPA\u2019s Greenhouse Gas Reporting Program<\/span><\/a><span style=\"font-weight: 400;\"> is open through Nov. 3, 2025.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In the decade since the Aliso Canyon disaster, oil and gas companies have demonstrated that controlling emissions isn\u2019t just feasible, it\u2019s economical. EDF estimates that since the first oil and gas emissions regulations went into effect in 2012, companies have saved around $2.6 billion worth of natural gas \u2014 demonstrating that with the right practices, it\u2019s possible to safely and economically manage methane as we transition to safer forms of energy.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As super storms, wildfires and other severe climate impacts wreak havoc on communities across the globe, the anniversary of one of the worst emissions events in our nation\u2019s history, and the actions that have unfolded since, should serve as a reminder that controlling methane is crucial for our climate, for energy security and our health.\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Massive gas leak at Aliso Canyon storage site put a national spotlight on the dangers of methane pollution. 10 years after the largest methane gas leak in U.S. history, national policies designed to limit methane pollution from certain oil and gas facilities are under attack.<\/p>\n","protected":false},"author":12459,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"coauthors":[114074,114055],"class_list":["post-24082","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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