LNG and hydrogen are often discussed as if one will simply succeed the other. The reality is more tangled. Both are energy carriers, but they occupy very different stages of technical and commercial maturity, and they are bound together by an awkward fact: most of the world's hydrogen is made from natural gas. This page compares the two on the dimensions that actually matter — physical properties, energy density, production routes, infrastructure, and emissions — and is deliberately careful not to present them as straightforward substitutes.
Two different kinds of fuel
LNG is natural gas — predominantly methane — cooled to about -162°C so it becomes a liquid that can be shipped by sea. It is a fossil fuel that releases CO₂ when burned, but it is also a mature, globally traded commodity supported by decades of infrastructure and contracts.
Hydrogen (H₂) is not a fossil fuel in itself; it is an energy carrier that must be manufactured. When hydrogen is used — burned or run through a fuel cell — it emits no CO₂ at the point of use, only water. That single property is why it attracts so much attention as a potential clean fuel. But hydrogen's climate credentials depend entirely on how it was produced, and its physical properties make it stubbornly difficult to move and store.
The energy-density problem
The defining technical contrast between the two fuels is volumetric energy density — how much energy you can pack into a given volume. This is where hydrogen struggles badly against LNG.
Hydrogen is the lightest element, so even compressed it holds little energy per litre. To carry it as a liquid, it must be cooled to roughly -253°C — far colder than LNG's -162°C, and close to absolute zero. Achieving and maintaining that temperature is energy-intensive and expensive. Worse, even after all that effort, liquid hydrogen still contains substantially less energy per litre than LNG does. The combination of an extreme cryogenic requirement and poor volumetric density makes hydrogen costly to liquefy, store, and ship.
This is the practical reason the industry is exploring alternative carriers. Rather than shipping pure liquid hydrogen, projects often plan to move it bound into ammonia or absorbed into liquid organic hydrogen carriers (LOHC), which are denser and easier to handle, then release the hydrogen at the destination. Each conversion step, however, adds cost and energy losses.
Side-by-side comparison
The table below summarises the main dimensions. Figures are approximate and intended to show the shape of the difference rather than precise values.
| Dimension | LNG | Hydrogen (H₂) |
|---|---|---|
| What it is | Liquefied natural gas (mostly methane), a fossil fuel | An energy carrier that must be manufactured |
| State & liquefaction temperature | Liquid at about -162°C | Liquid only at about -253°C (far colder) |
| Volumetric energy density | High for a cryogenic fuel | Low — far less energy per litre, even as a liquid |
| Maturity as a traded fuel | Mature, globally traded commodity | Nascent and costly as a traded energy fuel |
| Transport infrastructure | Extensive ships, terminals, and pipelines | Limited; large-scale transport infrastructure lacking |
| Emissions at point of use | Releases CO₂ when combusted | No CO₂ at point of use (only water) |
Grey, blue, and green: how hydrogen is made
Hydrogen is colour-coded not by anything visible — the gas itself is colourless — but by its production method, which determines its emissions footprint.
Grey hydrogen
Made from natural gas via steam methane reforming, which releases CO₂ in the process. This is by far the most common route today: most hydrogen produced worldwide is grey, and natural gas is in fact the main feedstock for global hydrogen production. In other words, the existing hydrogen industry is largely built on natural gas.
Blue hydrogen
The same steam-methane-reforming process, but paired with carbon capture and storage to trap much of the CO₂ before it reaches the atmosphere. Blue hydrogen is frequently framed as a bridge — a way to scale up low-carbon hydrogen using existing gas resources while greener methods mature. Its real-world climate benefit depends on how much CO₂ is actually captured and on upstream methane emissions.
Green hydrogen
Produced by electrolysis — splitting water into hydrogen and oxygen using electricity. When that electricity comes from renewable sources, the result carries no direct CO₂. Green hydrogen is the long-term aspiration for many decarbonisation plans, but it is currently expensive and produced at modest scale relative to grey hydrogen.
Infrastructure and maturity
This is perhaps the most important practical difference, and the one most easily overlooked in headlines. LNG sits on top of decades of investment: liquefaction plants, a global fleet of carriers, regasification terminals, long-term contracts, and trading desks. It is a working, liquid market.
Hydrogen as a traded energy fuel has almost none of that at scale. There is no large fleet of hydrogen carriers comparable to LNG ships, few dedicated long-distance transport routes, and limited storage. Building that infrastructure — or the ammonia and LOHC conversion chains that would substitute for it — represents an enormous, capital-intensive undertaking that is only beginning. Cost remains the central obstacle.
Complementary or competitive?
It is tempting to frame the two as rivals in a winner-takes-all contest, but that misreads how they relate. In the near term they are largely complementary: natural gas is the feedstock for most hydrogen, and blue hydrogen explicitly leans on existing gas supply plus carbon capture. Over a longer horizon, as green hydrogen scales and decarbonisation pressure grows, the two may become more competitive in specific applications such as heating, heavy transport, and industry.
The honest summary is that LNG and hydrogen are not simple substitutes. They differ in what they are, how they are made, how easily they move, and how clean they are at the point of use. For more on where gas fits in a decarbonising world, see the future of LNG.
Frequently asked questions
Does hydrogen replace LNG?
Not directly, and not soon. Both are energy carriers, but they sit at very different stages of maturity. LNG is a mature, globally traded commodity with extensive ships, terminals, and contracts; hydrogen as a traded fuel is still nascent, costly, and lacks large-scale transport infrastructure. In some uses the two compete over the long term, but they are partly complementary — most hydrogen made today actually comes from natural gas.
Why is hydrogen so hard to liquefy and ship?
Hydrogen has very low volumetric energy density and must be cooled to about -253°C to liquefy, far colder than LNG's -162°C. Even as a cryogenic liquid it holds far less energy per litre than LNG, so it is expensive to liquefy, store, and ship. That is why carriers such as ammonia or liquid organic hydrogen carriers (LOHC) are being developed to move hydrogen in a denser, more manageable form.
What are grey, blue, and green hydrogen?
These colours describe how hydrogen is produced. Grey hydrogen is made from natural gas via steam methane reforming, releasing CO₂. Blue hydrogen uses the same process but captures and stores much of that CO₂. Green hydrogen is made by electrolysis of water using renewable electricity, with no direct CO₂. Today most hydrogen is grey, and natural gas is the main feedstock for global hydrogen production.
Is hydrogen cleaner than LNG?
At the point of use, hydrogen emits no CO₂ when burned or used in a fuel cell, while LNG (methane) does release CO₂ when combusted. But hydrogen's overall climate impact depends entirely on how it was produced: grey hydrogen carries the emissions of the natural gas it is reformed from, while blue and green hydrogen aim to reduce or eliminate those. The honest comparison is full life-cycle, not just the point of use.