LNG Explained: How Liquefied Natural Gas Works From Wellhead to Terminal

Natural gas is abundant in places the world’s largest gas consumers are not. Qatar, Australia, and the United States hold vast reserves; Japan, South Korea, and much of Europe do not, and many of the largest deposits sit nowhere near a pipeline that could reach the markets that need them. Liquefied Natural Gas exists to solve exactly this problem: it shrinks natural gas to roughly 1/600th of its gaseous volume by cooling it to around -162 degrees Celsius, making it possible to ship gas across oceans in the same way crude oil has been shipped for a century.

LNG has grown from a niche technology into one of the most consequential infrastructure investments in the global energy system, with the International Energy Agency tracking a historic wave of new liquefaction capacity coming online through 2030. This guide explains how LNG actually works, from liquefaction through shipping to regasification, and why it has become central to global energy security.

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Key Takeaways

-162°C The temperature natural gas is cooled to for liquefaction, shrinking its volume to roughly 1/600th of its gaseous state and making ocean transport economically viable

550 bcm Of natural gas was exported as LNG globally in 2024, close to 15% of global natural gas consumption, according to IEA data, with a further wave of capacity due online through 2030

3 stages Liquefaction, shipping, and regasification form the core LNG value chain, each requiring highly specialised, capital-intensive infrastructure

4-5 years Typical time lag between an LNG project’s final investment decision and completion, making the industry highly cyclical and sensitive to long-term demand forecasting

• LNG is natural gas cooled to a liquid state for transport by ship to markets that pipelines cannot reach economically, enabling gas trade between regions that were previously isolated from each other.
• The LNG value chain has three core stages: liquefaction at export terminals, transport by specialised cryogenic tankers, and regasification at import terminals before injection into the receiving market’s gas network.
• LNG has connected previously separate regional gas markets into something closer to a single global market, with price correlations between regions reaching historic highs as flexible LNG cargoes move to wherever demand and price are strongest.
• The industry is highly cyclical and capital-intensive, with a 4-5 year typical gap between a project’s final investment decision and first production, creating investment waves followed by periods of tighter or looser supply.

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How Liquefaction Actually Works

Natural gas arriving at an LNG export terminal is first treated to remove water vapour, carbon dioxide, and other impurities that would freeze solid at cryogenic temperatures and damage the liquefaction equipment. The cleaned gas then passes through a liquefaction train, a series of heat exchangers and refrigeration cycles that progressively cool it to approximately -162 degrees Celsius, at which point it condenses into a liquid. According to the US Energy Information Administration, this liquefaction reduces the gas to roughly 1/600th of its original volume, the single fact that makes ocean transport of natural gas commercially viable at all.

LNG liquefaction trains are among the most capital-intensive industrial facilities built anywhere, often costing tens of billions of dollars for large-scale projects, and the engineering complexity of operating cryogenic refrigeration at this scale continuously, safely, and reliably is a specialised discipline in its own right.

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Shipping: The Most Visible Part of the Chain

LNG carriers are purpose-built ships with cryogenic storage tanks capable of keeping their cargo at -162 degrees Celsius for weeks at sea. Even with excellent insulation, a small amount of the cargo continuously vaporises during transit, known as boil-off gas, which modern carriers typically capture and use as fuel for the ship’s own propulsion, a neat solution that turns an unavoidable loss into useful energy.

The flexibility of LNG shipping, unlike a fixed pipeline, a cargo can be redirected mid-voyage to whichever market offers the best price, is one of the defining features that has reshaped global gas markets. This flexibility has strengthened price correlation between regional gas markets that were previously largely disconnected, since a growing share of global LNG capacity is contracted on a destination-flexible basis rather than tied to a single buyer and route.

Regasification: Completing the Journey

At the import terminal, LNG is offloaded into onshore or floating cryogenic storage tanks and then regasified, warmed back into its gaseous state, before being injected into the receiving country’s pipeline network for distribution to power plants, industrial users, and residential customers. Regasification terminals require the same order of engineering sophistication as liquefaction facilities, managing the reverse thermal process at scale while maintaining the safety margins that cryogenic operations demand.

The construction, commissioning, and safe operation of both liquefaction and regasification facilities require the kind of rigorous project management discipline covered in our article on how to build a project risk register that actually gets used, given the scale of capital at risk and the safety-critical nature of cryogenic infrastructure.

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Why LNG Investment Is Highly Cyclical

LNG projects typically take four to five years between final investment decision and first production, a lag that makes the industry structurally prone to boom and bust investment cycles. When prices are high, developers rush to sanction new projects; those projects then arrive years later, often in a cluster, adding significant new supply capacity to the market simultaneously and pushing prices down again. The IEA’s Global LNG Capacity Tracker recorded more than 450 billion cubic metres per year of new LNG export capacity reaching final investment decision between 2019 and mid-2026, with the pace of sanctioning accelerating further into 2025 and 2026, representing the largest wave of LNG capacity additions on record and one that will materially reshape global gas market balances as it comes online through the rest of the decade.

This cyclicality creates a genuine planning challenge for everyone across the value chain. Buyers negotiating long-term supply contracts must forecast demand and price a decade or more into the future, knowing that a wave of new supply arriving simultaneously with competing projects can materially change the market they eventually sell into. Developers face the opposite risk: sanctioning a project during a period of high prices only to see it reach production into a market that has since been reshaped by competing capacity. Managing this uncertainty well requires exactly the kind of scenario planning and risk-informed decision-making that characterises the strongest commercial teams in the industry.

Commercial Structures: How LNG Is Bought and Sold

LNG trade historically relied heavily on long-term contracts, often 15 to 20 years, between a specific liquefaction project and a specific buyer, providing the revenue certainty needed to justify the enormous capital cost of building a liquefaction train. These contracts were traditionally priced against oil-linked formulas, reflecting LNG’s historical role as a substitute for oil in many Asian markets. Over the past decade, the market has diversified significantly: a growing share of global LNG volume is now sold on shorter-term contracts or spot cargoes, priced against gas-specific benchmarks such as the US Henry Hub or European TTF, and increasingly with destination flexibility that allows a cargo to be redirected to whichever market offers the best value at the time of delivery. This shift has made the global LNG market considerably more liquid and more responsive to short-term supply and demand shifts than it was even a decade ago, though the largest new projects still typically require a meaningful base of long-term contracted volume to secure project financing.

Frequently Asked Questions

What is the difference between LNG and LPG?

LNG (Liquefied Natural Gas) is primarily methane, cooled to a liquid at extremely low temperature. LPG (Liquefied Petroleum Gas) is a different product, primarily propane and butane derived from crude oil refining or natural gas processing, and can be liquefied through pressurisation alone without requiring cryogenic cooling. They serve different markets and require entirely different infrastructure.

Why can’t natural gas just be transported as a gas by ship?

In its gaseous state, natural gas takes up roughly 600 times more volume than as a liquid, making it commercially impractical to transport by ship over long distances without liquefaction. Liquefaction is what makes intercontinental gas trade economically viable.

Is LNG safe to transport?

LNG shipping has a strong safety record, supported by rigorous international design and operating standards for both carriers and terminals. LNG is not explosive in its liquid form and requires specific conditions to ignite even as vapour, though the industry maintains extensive safety protocols given the scale and low temperature of the cargo involved.

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Conclusion: Infrastructure That Connects the World’s Gas Markets

LNG has transformed natural gas from a regionally constrained fuel, tied to wherever a pipeline could reach, into a globally tradeable commodity. The scale of investment now flowing into new liquefaction and regasification capacity reflects how central this infrastructure has become to global energy security, and the professionals who understand its technical and commercial fundamentals are positioned at the centre of one of the energy sector’s most consequential ongoing transformations.

Related reading: LNG is one part of the broader oil and gas value chain. Our article on oil and gas industry overview: upstream, midstream, and downstream explained covers how LNG fits alongside pipeline transport, refining, and petrochemicals in the full picture of how the industry moves hydrocarbons from wellhead to end user.

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