LNG and pipeline gas are not rival fuels — they are the same fuel moved two different ways. Both deliver methane to a burner. The choice between them is an infrastructure and economics question: a pipeline is a fixed steel artery that is cheapest over land and over the long run, while LNG trades a large upfront energy and capital penalty for the freedom to ship gas anywhere there is a coastline. Understanding where the break-even sits explains most of the structure of today's global gas trade.
The same molecule, two delivery systems
It is worth being precise, because the question "LNG or natural gas?" is often phrased as if they were different substances. They are not:
- Pipeline gas stays gaseous. It is compressed to 50-100 bar and pushed through buried steel pipe by compressor stations spaced along the route.
- LNG is that same gas cooled to -162°C until it condenses to a liquid roughly 1/600th the volume, loaded onto a cryogenic ship, sailed to its destination, and then warmed back into gas (regasified) so it can enter the local pipeline grid.
Once an LNG cargo has been regasified, it is physically identical to gas that was always piped. The entire LNG industry exists to solve one problem: how to move methane across water, or across distances where a pipeline is uneconomic or politically impossible. See the physics of LNG for why the 600:1 volume reduction is what makes this work.
Cost structure: where the money goes
The two systems have almost opposite cost profiles. A pipeline is dominated by the capital cost of laying the pipe; once built, moving more gas through it is cheap. The LNG chain adds two expensive industrial plants — one to liquefy, one to regasify — plus a specialised ship for every cargo in transit.
| Stage | Pipeline gas | LNG |
|---|---|---|
| Upstream production | Same | Same |
| Conversion plant | None | Liquefaction terminal ($billions, multi-year build) |
| Transport asset | Buried pipeline + compressor stations | Fleet of cryogenic LNG carriers (~$200-260M each) |
| Receiving plant | None | Regasification terminal or FSRU |
| Cost scales with… | Distance (steel per km) | Mostly fixed per cargo; less sensitive to distance |
This is the heart of the trade-off. Pipeline cost rises steadily with every kilometre of pipe. LNG carries a heavy fixed cost at each end, but the marginal cost of sailing an extra few thousand kilometres is comparatively small. Plot the two against distance and the lines cross.
The distance break-even
The classic rule of thumb, popularised in pipeline-versus-LNG economic studies, is approximate but durable:
- Onshore pipelines tend to beat LNG out to roughly 3,000-4,000 km.
- Offshore (subsea) pipelines are far more expensive to lay, so LNG becomes competitive much sooner — often beyond ~1,500-2,000 km.
- Across an ocean, or anywhere a pipeline would have to cross hostile or impassable territory, LNG is effectively the only option regardless of the arithmetic.
These numbers are illustrative, not fixed: the real crossover depends on terrain, water depth, plant scale, the cost of capital, and how fully the liquefaction plant is utilised. But the shape is reliable — short and onshore favours pipe; long and over water favours LNG.
Energy lost along the way
Both systems burn some of the gas they carry, but the LNG chain consumes considerably more:
- Pipeline: compressor stations burn a small fraction of throughput — on the order of a few percent over a long line, rising with distance.
- LNG liquefaction: cooling gas to -162°C consumes roughly 8-10% of the feed gas energy (see the liquefaction process).
- Shipping: the ship burns fuel, and a small amount of cargo evaporates as boil-off gas (typically 0.1-0.15%/day), often used to power the vessel.
- Regasification: a smaller energy cost to warm the liquid back into gas.
Summed across the chain, delivering energy as LNG typically loses around 10-15% of it to the process itself — energy that also carries a CO₂ cost. This is a real efficiency disadvantage versus a pipeline, and one reason gas exporters prefer to pipe gas to neighbours and reserve LNG for distant markets.
Flexibility and energy security
Where LNG decisively beats pipeline gas is optionality. A pipeline is a marriage: it connects one seller to one buyer along one fixed route, and neither party can easily change partners. An LNG cargo is a free agent — it can be sold, swapped, or re-routed mid-voyage to whichever market is paying most.
This flexibility is exactly why Europe leaned so heavily on LNG after 2022, replacing a large share of Russian pipeline imports with seaborne cargoes from the United States, Qatar, and others. Floating storage and regasification units (FSRUs) let importers stand up new receiving capacity in months rather than the years a pipeline or land terminal requires. The cost of that resilience is the higher per-unit price of LNG — a premium many importers now treat as insurance.
So which is "better"?
Neither, in the abstract. They solve different problems:
- Choose pipeline gas for moving large, steady volumes between neighbouring regions over land — it is cheaper, more energy-efficient, and simpler.
- Choose LNG to reach markets across oceans, to diversify away from a single supplier, or to add supply quickly. You pay an energy and cost premium for reach and flexibility.
In practice the global system uses both: gas is piped where geography allows and liquefied where it does not, and the two networks increasingly interconnect at regasification terminals around the world.
Frequently asked questions
Is LNG the same as pipeline natural gas?
Yes. Both are predominantly methane. LNG is simply natural gas cooled to -162°C so it becomes a liquid that takes up about 600 times less volume, making it shippable by sea. Once regasified, it re-enters a pipeline network and is indistinguishable from gas that was always piped.
Is LNG more expensive than pipeline gas?
Over short and medium distances on land, pipeline gas is almost always cheaper because it skips the liquefaction and regasification steps. LNG becomes competitive over long distances — roughly beyond 2,000-4,000 km for offshore routes — and it is the only option where a pipeline is physically or politically impossible.
How much energy is lost turning gas into LNG?
Liquefaction alone consumes about 8-10% of the feed gas energy. Adding shipping fuel, boil-off, and regasification, the full LNG chain typically consumes around 10-15% of the delivered energy, versus a few percent of compressor fuel for a long pipeline.
Why did Europe switch from pipeline gas to LNG?
After 2022, Europe sharply cut Russian pipeline imports and replaced much of that volume with seaborne LNG. LNG offered supply diversity and flexibility — cargoes can be redirected between buyers — which pipeline gas, locked to a fixed route and a single supplier, cannot.