What Is LNG? From Liquefaction to Regasification in the Global Gas Trade
LNG is natural gas made portable. By cooling gas into a liquid, exporters can move energy across oceans, store it more efficiently, and reach buyers beyond pipeline networks, as the EIA LNG explainer notes.
That physical change creates a full chain from treatment to regasification. The IEA glossary describes LNG as a gas that is cooled, shipped by sea, and then heated back into gas at the other end, with liquefaction and regasification terminals as the core infrastructure.
What LNG Actually Is
Liquefied natural gas is the same fuel in a different state. Natural gas, mainly methane, is cooled to about minus 162 degrees Celsius (about minus 260 degrees Fahrenheit) at atmospheric pressure. In liquid form, it occupies about 1/600th of the original volume, which is what makes seaborne transport practical.
For global gas trade, that matters because LNG separates the molecule from the pipeline map. A cargo can be loaded in one region, sailed to another, and then turned back into gas for local use, which gives buyers and sellers more routing and supply options than fixed pipelines alone. IEA market analysis describes LNG as the main driver of international gas trade, and the glossary puts its share at around half of global gas trade. (iea.org)
How LNG Moves from Field to Market
The chain starts well before the cargo reaches a ship. Natural gas usually needs treatment to remove dust, acid gases, water, helium, and heavy hydrocarbons so that it can meet pipeline or LNG specifications before liquefaction.
At the liquefaction terminal, gas arrives by pipeline and is cooled into liquid form. EIA also notes that LNG export terminals consume part of the feed gas to run on-site liquefaction equipment, which is one reason the process is operationally and energetically intensive.
Key Stages in the LNG Chain
Stage | What happens | Why it matters commercially |
|---|---|---|
Gas treatment | Impurities are removed before the stream reaches the liquefaction terminal. | Specification control protects process stability and contract quality terms. |
Liquefaction | The gas is cooled into liquid form and some feed gas is used to power on-site equipment. | The liquid form makes long-distance maritime transport possible. |
Shipping | LNG moves in specialized carriers with cryogenic tanks under international ship safety rules. | Vessel compatibility and port readiness affect execution timing. |
Regasification | The cargo is offloaded, stored, and heated back into gas at the import terminal. | Import terminal capacity can shape how much LNG a market can absorb. |
Contract terms | Incoterms define when delivery occurs and when risk transfers. | Clear terms reduce dispute risk across loading, freight, insurance, and discharge. |
Shipping LNG Safely
LNG is transported on specialized carriers with insulated, cryogenic tanks. The IMO's IGC Code sets the international standard for the safe transport by sea in bulk of liquefied gases, with the aim of reducing risk to the ship, the crew, and the environment.
For decision-makers, that means shipping is not a simple freight step. It is a coordination exercise that depends on vessel design, port compatibility, cargo quality, and timing discipline. If any one of those pieces is out of alignment, the commercial plan can slow down even when the molecules themselves are available.
Regasification: Turning Liquid Back Into Pipeline Gas
At the import terminal, LNG is offloaded from the ship, stored in cryogenic tanks, and then returned to its gaseous state. From there, it moves by pipeline to power plants, industrial facilities, or other customers.
In other words, regasification is not just a technical step. It is the bridge between ocean transport and local gas use, and the terminal becomes a strategic asset whenever a market depends on flexible supply, storage, or seasonal balancing.
Commercial Logic: Contracts, Risk, and Delivery Points
In LNG trade, the delivery term matters because it determines who delivers the cargo, who pays freight and insurance, and when risk changes hands. ICC's Incoterms® 2020 sea transport rules explain that, under FOB, risk passes when the goods are on board the vessel, while CFR and CIF also use shipment on board as the transfer point but allocate freight and insurance differently.
That is why LNG contracts need precision around the loading port, the discharge terminal, timing windows, and any quality or operational specifications that affect acceptance. A well-written contract reduces friction between the physical shipment and the commercial promise behind it.
For buyers and sellers, the molecule is only part of the equation. Terminal capacity, vessel access, specifications, and delivery terms can be just as important as the gas itself because they determine whether a cargo can be lifted, moved, and accepted on schedule.
At Nedjma, our NOOR-Trading division supports LNG-related market intelligence, contract structuring, and risk review.
Related explainers on gas infrastructure, shipping and contracts are collected on the blog.
FAQ
Is LNG the same thing as natural gas?
Yes, in practical commercial terms it is the same gas, mainly methane, but in liquid form. The gas is cooled to roughly minus 162 degrees Celsius so that it occupies far less space and can be transported by sea. Once it reaches the destination terminal, it is regasified and sent into pipelines or used locally. The key difference is therefore physical state, not fuel identity.
Why do exporters liquefy gas instead of shipping it as gas?
Liquefaction makes long-distance maritime transport practical where pipelines are absent or uneconomic. A liquid cargo takes up only a fraction of the space of gas, which allows more efficient storage and shipping. For exporters and buyers, that opens access to distant markets, but it also means liquefaction capacity, shipping availability, and terminal access all become commercial constraints.
What happens at a regasification terminal?
The cargo is unloaded from the vessel, stored in cryogenic tanks, and then heated back into gas before entering the pipeline system. From there, it can move to power plants, industry, or other end users. In markets that depend on LNG, regasification capacity is a strategic part of supply security because it determines how quickly imported cargo can be absorbed. Storage tanks and vaporization equipment sit at the heart of that process.
Which contract terms matter most in LNG trade?
Delivery point and risk transfer are central. ICC's Incoterms® rules show that FOB transfers risk when the cargo is on board the vessel, while CFR and CIF also place delivery on board but change who handles freight and insurance. In LNG, that means the contract should be precise about loading point, discharge point, documentation, and who carries each operational cost. In practice, the paper contract and the physical cargo must move together.
What safety rules govern LNG shipping?
The IMO's IGC Code is the key international standard for ships carrying liquefied gases in bulk. It sets design and equipment requirements intended to reduce risk to the ship, crew, and environment. In practice, that means the ship, the terminal, and the contract documents must all align before a cargo can move safely and on schedule.
What Comes Next?
If your team is evaluating LNG sourcing, shipping, or contract structure, start with our homepage or contact Nedjma to discuss the opportunity in commercial terms.
