Aramco Buries 9 Million Tons of CO2 Yearly Underground

Nine million tons of carbon dioxide disappear every year. Not into the atmosphere. Into the ground.

Aramco's Jubail facility captures industrial exhaust before it escapes, compresses it, and pumps it 2,000 meters below the surface into ancient saltwater reservoirs. The CO2 stays there permanently, locked in porous rock that once held oil and gas. By 2027, this single hub prevents emissions equivalent to taking 2 million cars off the road.

Why Industrial Emissions Need a Different Solution

Power plants can shift to solar. Cars can go electric. But refineries and chemical plants produce unavoidable CO2 as part of the chemistry itself.

Converting natural gas into hydrogen releases carbon dioxide. Petrochemical manufacturing generates millions of tons yearly. Cement production creates CO2 when limestone breaks down at high temperatures. These aren't inefficiencies you can engineer away—they're fundamental to the industrial processes that make modern life possible.

Saudi Arabia exports 70% of its oil production. The economy depends on hydrocarbons. But the country also committed to net-zero emissions by 2060 and set an interim target: capture 44 million tons of CO2 annually by 2035. Meeting both goals required infrastructure that could handle industrial-scale emissions without halting energy production.

This is why the Jubail CCS hub matters. It's not a pilot project. It's shared infrastructure where multiple industrial facilities connect to one centralized system, splitting costs while maximizing capture capacity. Aramco explains the hub model allows industrial emitters to share CO2 transport and storage infrastructure, reducing risks and costs through economies of scale.

How the Carbon Capture and Storage System Actually Works

The system follows three stages: capture, transport, storage.

First: Capture at the source. CO2 gets separated from industrial exhaust before it reaches the atmosphere. Three Aramco gas plants—Hawiyah, Uthmaniyah, and Wasit—produce high-purity CO2 streams during natural gas processing. These contribute around 6 million metric tons annually. Additional industries in Jubail's industrial zone add the remaining 3 million tons.

Second: Pipeline transport. Captured CO2 travels through compression units that reduce its volume, then moves via pipeline network to the storage site. SLB manages the transport infrastructure, applying subsurface engineering expertise developed from decades of oilfield operations.

Third: Underground injection. The CO2 gets pumped into a saline aquifer—a deep rock formation filled with saltwater unsuitable for drinking or agriculture. These geological formations trap CO2 permanently through physical barriers and chemical reactions where carbon dioxide mineralizes into stable compounds over time.

The project operates as a joint venture. Aramco holds 60% equity. Linde and SLB each own 20%. The partnership combines Aramco's geological knowledge with Linde's gas processing technology and SLB's subsurface capabilities. Larsen & Toubro won the $1.5 billion construction contract in February 2025.

The Hub Model Changes the Economics

The strongest part isn't just the capture technology. It's the scale and structure.

A shared carbon capture and storage hub works like a regional utility. Industrial plants connect to centralized infrastructure instead of building separate systems. That matters because industrial regions contain many emissions sources close together. Jubail is one of Saudi Arabia's major industrial zones—perfect for large-scale CCS.

One facility might struggle to justify the cost of building its own capture, pipeline, and storage system. Ten facilities sharing one hub change the math entirely.

This approach supports Saudi Arabia's wider carbon management plans, part of the Saudi Green Initiative and Vision 2030 economic diversification strategy. The Kingdom aims to capture 44 million metric tons per year by 2035. Aramco targets 11 million tons of CO2 equivalent by 2035 across its operations.

The Link to Blue Hydrogen and Ammonia

The Jubail hub isn't just about storing emissions. It enables low-carbon fuel production.

Hydrogen made from natural gas typically releases CO2 during production. Capture and store that CO2 instead of releasing it, and the hydrogen becomes blue hydrogen—same process, zero atmospheric emissions. Blue ammonia makes hydrogen easier to ship internationally because ammonia remains liquid at higher temperatures than pure hydrogen.

Aramco's producing 1.2 million tons of blue ammonia yearly at Jubail. South Korean industrial giants Hyundai and KNOC signed purchase agreements. Automotive companies Geely and Renault partnered to develop future demand for hydrogen-based fuels. The captured CO2 makes these fuels "low-carbon" enough to meet international climate standards.

Countries transitioning away from fossil fuels still need hydrogen for steel production, shipping fuel, and aviation. Blue hydrogen fills that gap faster than green hydrogen from renewable electricity, which requires massive solar and wind installations not yet built at scale globally.

What This Means Beyond Saudi Arabia

The Jubail facility represents Phase 1. Future expansions will increase capacity beyond 9 million tons as more industrial emitters connect. Saudi Arabia's national target of 44 million tons by 2035 requires approximately five hubs of this scale.

Aramco also pilots direct air capture technology in partnership with Siemens Energy—systems that pull CO2 directly from ambient air rather than industrial exhaust. Mobile carbon capture for vehicles stores up to 40% of car emissions onboard for later collection at fuel stations.

The project creates thousands of jobs in engineering, construction, and operations while fostering research partnerships with Saudi universities focused on carbon management innovation. Economic diversification happens alongside emissions reduction.

If the Jubail hub reaches planned scale, it becomes one of the world's largest CO2 sequestration facilities. It may also provide a model for other industrial regions—the Gulf Coast in the United States, industrial zones in China, European chemical clusters—that need shared infrastructure to manage emissions from multiple facilities.

Why This Innovation Matters

Carbon capture and storage remains debated. Supporters see it as necessary for industries that can't decarbonize quickly. Critics argue it's expensive and shouldn't delay the transition to cleaner energy.

Both points matter.

What makes Jubail important is its scale and structure. This isn't a laboratory experiment. It's a large industrial system testing whether carbon capture can work as shared infrastructure across a major industrial region. The hub model—multiple emitters connecting to centralized transport and storage—could prove more practical than expecting every facility to build separate systems.

The project also shows how energy-producing countries navigate two goals simultaneously: continue supplying energy and industrial materials while reducing emissions from those activities. For Saudi Arabia, Jubail fits into that strategy, including Aramco's ambition to reach net-zero Scope 1 and Scope 2 greenhouse gas emissions across wholly owned assets by 2050.

Construction completes by end of 2027. Operations begin in 2028. Later phases may expand capacity further as more industrial facilities connect to the shared infrastructure.