LNG vs LPG: Key Differences Explained (Composition, Storage, Uses and Market Role)

LNG vs LPG defined LNG (liquefied natural gas) is primarily methane cooled to −162°C to reduce it to liquid form for bulk transport. LPG (liquefied petroleum gas) is propane and/or butane held liquid under moderate pressure at ambient temperatures. They are different fuels with different compositions, different storage requirements, different markets, and very different price dynamics. The confusion is understandable — both have “liquefied” and “gas” in the name — but they serve entirely separate purposes in global energy supply chains.

Table of Contents

1. What LNG Is
2. What LPG Is
3. Key Differences at a Glance
4. How Each Is Produced and From Where
5. Storage and Transport: Why It Matters for Shipping
6. Uses: What Each Fuel Powers
7. LNG Price Benchmarks and the Spot Market
8. The US LNG Export Boom
9. LNG Bunkering: IMO 2020 and Shipping Fuel
10. Frequently Asked Questions
11. Key Takeaways

What LNG Is

LNG stands for liquefied natural gas. It is natural gas — primarily methane (CH4), the same gas used for heating and cooking — that has been cooled to approximately −162°C (−260°F), at which point it becomes liquid and occupies about 1/600th of its gaseous volume.

That volume reduction is the whole point. Natural gas pipelines are expensive and geographically constrained — you cannot pipe gas across an ocean. By liquefying it, you can load it onto a specialised ship, transport it anywhere in the world, and regasify it at the destination for use in pipelines.

LNG is not a fuel in its own right in the way diesel or petrol is. It is natural gas in a transport-friendly state. At the destination terminal, it is warmed back to a gas (regasification) and sent into the pipeline network. From the consumer’s perspective, they are receiving natural gas — the LNG phase was purely a transport mechanism.

The global LNG trade is enormous. In 2023, approximately 404 million tonnes of LNG moved internationally — making it one of the largest commodity trades in the world by value. Qatar, Australia, and the United States are the three largest exporters.

What LPG Is

LPG stands for liquefied petroleum gas. It is a mixture of propane (C3H8) and butane (C4H10) — heavier hydrocarbon gases that are extracted either from natural gas processing or from crude oil refining.

Unlike LNG, LPG does not need extreme cold to stay liquid. At room temperature, modest pressure (approximately 8–20 bar, or 115–290 psi) is enough to keep propane liquid. Butane liquefies at even lower pressure. This is why LPG can be stored in standard pressurised cylinders and tanks — the familiar gas bottles used for barbecues, camping stoves, and rural heating.

LPG is a distinct product from natural gas, not just natural gas in a different state. Propane and butane have different molecular structures, different energy contents, and different uses than methane. They are naturally present in small quantities in natural gas streams and are separated out during gas processing; they also emerge from crude oil refining as byproducts.

Global LPG trade runs to approximately 120 million tonnes per year. The United States, which produces massive volumes of propane and butane as byproducts of its Permian Basin and Marcellus shale gas operations, became the world’s largest LPG exporter from the mid-2010s.

Key Differences at a Glance

Feature	LNG	LPG
Main component	Methane (CH4)	Propane (C3H8) and/or Butane (C4H10)
Liquefaction method	Cooling to −162°C	Pressurisation (modest pressure)
Storage temperature	Cryogenic (very cold)	Ambient temperature
Storage pressure	Near atmospheric	Pressurised (8–20 bar)
Ship type	LNG carrier (cryogenic tankers)	LPG carrier (pressurised/semi-refrigerated)
Primary origin	Natural gas fields	Gas processing plants; oil refineries
Main uses	Power generation, industrial, city gas	Heating, cooking, autogas, petrochemicals
Price benchmark	JKM, TTF, Henry Hub	Argus, Mont Belvieu propane
Typical buyer	Utilities, gas distributors	Households, autogas distributors, petrochemical plants

How Each Is Produced and From Where

LNG production

LNG starts at a natural gas field. Raw natural gas is extracted, cleaned to remove impurities (CO2, H2S, water, mercury), and then liquefied at an LNG liquefaction terminal. Liquefaction requires massive refrigeration equipment — compressors driven by gas turbines cool the gas through multiple stages until it reaches −162°C.

Major LNG liquefaction terminals (called liquefaction trains):

• Qatar: North Field expansion — the world’s largest LNG project; Qatargas and RasGas
• Australia: APLNG, Gorgon, Wheatstone, Ichthys, Prelude (Shell’s offshore FLNG)
• United States: Sabine Pass (Cheniere), Corpus Christi (Cheniere), Freeport, Cove Point, Cameron
• Russia: Sakhalin-2, Yamal LNG, Arctic LNG 2 (sanctioned post-2022)

LPG production

LPG is produced two ways:

1. Gas processing: Natural gas from wells contains small percentages of propane and butane alongside methane. Gas processing plants strip these heavier components out for separate sale. US shale gas production (especially associated gas from Permian Basin oil wells) produces large volumes of LPG this way.

1. Oil refining: Crude oil refining produces propane and butane as byproducts. Fluid catalytic cracking (FCC) and hydrocracking units generate substantial LPG volumes. Middle Eastern refineries and US Gulf Coast refineries are significant LPG producers this way.

Storage and Transport: Why It Matters for Shipping

The storage and transport requirements of LNG and LPG differ so dramatically that they use entirely different vessel fleets, terminal infrastructure, and handling procedures.

LNG storage and shipping

LNG must be kept at −162°C. LNG carriers are insulated cryogenic vessels — the most technically complex ships afloat. They use double-hull construction with vacuum-insulated inner tanks (typically Moss spherical tanks or membrane tanks). Even with insulation, a small amount of LNG constantly boils off (called “boil-off gas”). Modern LNG carriers use this boil-off as ship fuel rather than venting it.

LNG carriers range from approximately 70,000 m³ (small LNG carriers serving smaller ports) to 266,000 m³ for the largest Q-Max vessels that serve only Qatari export terminals. A standard large LNG carrier holds around 174,000 m³.

LNG import terminals require regasification equipment — heat exchangers that warm the LNG back to gas using seawater, ambient air, or combustion — plus storage tanks and pipeline connections. These terminals cost hundreds of millions to build and take years to permit and construct.

LPG storage and shipping

LPG ships are pressurised or semi-refrigerated vessels, technically much simpler than LNG carriers. At ambient temperature, propane requires only modest overpressure (8–14 bar) to stay liquid. Semi-refrigerated vessels carry LPG at −50°C (for propane) or −5°C (for butane) at lower pressure, reducing the hull strength requirements.

Very Large Gas Carriers (VLGCs) transport bulk LPG — up to 84,000 m³. Smaller LPG carriers serve regional distribution. LPG can also be stored in standard pressurised tanks on shore, without the elaborate insulation systems LNG requires.

This simpler storage requirement means LPG can be handled at many more ports worldwide, making it more accessible for developing-country heating and cooking markets than LNG.

Uses: What Each Fuel Powers

LNG end uses

The primary end use of LNG (after regasification) is identical to pipeline natural gas: it powers the same equipment and competes with the same fuel alternatives.

• Power generation: gas turbines and combined-cycle gas plants that generate electricity. Japan, South Korea, and Taiwan — countries with limited domestic natural gas — import LNG to power their electricity grids.
• Industrial fuel: steel, cement, chemicals, glass, and food manufacturing use natural gas as both a fuel and a chemical feedstock.
• City gas / residential heating: urban natural gas networks in many countries are supplied partly or wholly by imported LNG.
• LNG as a transport fuel: large ships (container vessels, bulk carriers, cruise ships) and some heavy trucks use LNG as fuel, particularly following the IMO 2020 sulphur regulations (see section below).

LPG end uses

LPG serves different markets entirely.

• Residential cooking and heating: LPG cylinders or tanks serve households without access to natural gas pipelines — a massive global market across rural areas of Asia, Africa, and Latin America.
• Autogas: LPG (primarily propane) is used as a vehicle fuel in many countries. Turkey, South Korea, Poland, and Russia have significant autogas markets.
• Petrochemicals: propane and butane are feedstocks for ethylene and propylene production via steam cracking — inputs to plastics manufacturing.
• Refinery use: propane and butane are used as blending components in gasoline and as fuel in refinery operations.
• Industrial use: LPG is used for industrial heating, cutting, and process heat in applications where a portable or stored fuel is needed.

LNG Price Benchmarks and the Spot Market

Unlike crude oil, LNG does not have a single global price. Regional prices reflect local supply-demand conditions, with three major benchmarks:

JKM (Japan-Korea Marker) Published by S&P Global Commodity Insights (Platts), JKM is the benchmark for LNG delivered to Japan and South Korea — the world’s two largest LNG importers. It is quoted in USD per MMBtu (million British thermal units). JKM is the most liquid Asia-Pacific LNG price and is used in contracts across Asia.

TTF (Title Transfer Facility) TTF is the Dutch gas hub price, the dominant benchmark for natural gas and LNG in Europe. While technically a natural gas price (for gas delivered into the Dutch natural gas grid), TTF is used as the de facto European LNG price because imported LNG competes directly with pipeline gas in the European market. Quoted in EUR per MWh.

Henry Hub Henry Hub in Louisiana is the NYMEX benchmark for US natural gas — the wellhead price from which much US LNG export pricing is structured. Many US LNG supply contracts (Cheniere long-term contracts with Asian buyers) are priced at Henry Hub plus a fixed liquefaction and shipping cost.

Historical price context

In normal pre-2021 markets, JKM traded in the range of $4–10/MMBtu. Following the Russian invasion of Ukraine in February 2022, which triggered European scramble for LNG to replace Russian pipeline gas, TTF spiked to an equivalent of over $70/MMBtu in August 2022 — an unprecedented level. JKM also spiked sharply as Asian buyers competed with European buyers for available LNG cargoes. By 2024, prices had returned to $10–15/MMBtu range but remained structurally higher than pre-2021 levels.

LPG prices are primarily quoted via Argus Media (propane and butane assessments) and the Mont Belvieu, Texas hub for US propane and butane. LPG markets are generally less globalised than LNG, with more regional pricing variation.

The US LNG Export Boom

The United States was a net LNG importer as recently as 2015 — spending billions building import terminals to bring LNG from the Middle East. The shale revolution inverted this entirely.

US shale gas production, primarily from the Marcellus (Pennsylvania, West Virginia) and Permian-associated gas (Texas), gave the US an enormous surplus of cheap natural gas. Henry Hub natural gas prices fell to $2–4/MMBtu — far below what European and Asian buyers were paying for LNG from Qatar and Australia.

The arbitrage opportunity was massive. Companies began building LNG export terminals — essentially liquefaction plants bolted onto existing import terminals or greenfield sites on the Gulf Coast.

Key US LNG export terminals:

• Sabine Pass (Louisiana, Cheniere Energy): the first US LNG export terminal, operational from 2016. Now has six liquefaction trains with a combined capacity of approximately 30 mtpa (million tonnes per annum).
• Corpus Christi (Texas, Cheniere): three trains operational, additional trains in construction.
• Freeport LNG (Texas): three trains, approximately 15 mtpa. Suffered a major explosion and fire in 2022, taking it offline for nearly a year.
• Cameron LNG (Louisiana): three trains, approximately 12 mtpa.
• Cove Point (Maryland, Dominion): one train, approximately 5.25 mtpa.

The US became the world’s largest LNG exporter in 2023, overtaking Qatar and Australia. This transformed American gas markets — Henry Hub prices are now more sensitive to global LNG demand than before, and the US has emerged as a major swing supplier to European and Asian buyers.

The Russia-Ukraine energy crisis accelerated European demand for US LNG enormously. Europe diversified away from Russian pipeline gas (which supplied approximately 40% of European natural gas before 2022) toward US, Qatari, and Norwegian LNG and pipeline supply. New floating storage and regasification units (FSRUs) were deployed rapidly in Germany, Italy, the Netherlands, and Finland to handle LNG imports.

LNG Bunkering: IMO 2020 and Shipping Fuel

One of the fastest-growing uses of LNG is as a fuel for ships — a market known as LNG bunkering.

IMO 2020 — the International Maritime Organization’s sulphur cap that took effect January 1, 2020 — limited the sulphur content of ship fuel to 0.5% globally (and 0.1% in designated Emission Control Areas). This made traditional heavy fuel oil (HFO) non-compliant unless ships installed exhaust gas scrubbers.

LNG contains virtually no sulphur and produces minimal particulate emissions. As a marine fuel, it also reduces NOx (nitrogen oxide) emissions significantly compared to HFO. For new ships whose owners want to avoid scrubber investment and position themselves for future carbon regulations, LNG was an attractive alternative fuel.

LNG-powered ships now include major container vessels (CMA CGM’s megaships, MSC’s LNG-fuelled ships), cruise ships (AIDA, MSC Cruises), car carriers, and ferries. As of 2025, LNG is the dominant alternative marine fuel by fleet size, though ammonia and methanol are emerging competitors for newbuilds targeting 2030s compliance.

LNG bunkering infrastructure — the ports and vessels supplying LNG as ship fuel — is growing but still limited to selected major ports. The Port of Rotterdam, Singapore, Zeebrugge, and a handful of other hubs have established LNG bunkering operations. Smaller ports often cannot handle LNG bunkering, limiting where LNG-fuelled ships can refuel.

Frequently Asked Questions

Can LNG and LPG be stored in the same tanks?

No. They require completely different infrastructure. LNG needs cryogenic tanks capable of holding liquid at −162°C, with vacuum or foam insulation and boil-off management systems. LPG needs pressurised tanks rated for 8–20 bar at ambient temperature. The two systems are incompatible and serve entirely separate terminal and storage infrastructure.

Is LPG cheaper than LNG?

They serve different markets and are not directly comparable per unit. LPG (propane) is priced on its energy content and competes with heating oil and natural gas as a residential fuel. LNG is priced as a bulk energy commodity for industrial and utility buyers. On a per-MMBtu energy basis, LPG is generally more expensive than LNG for large industrial buyers, but LPG’s accessibility (no pipeline infrastructure needed) makes it cost-competitive for rural households where it is the only practical piped-energy substitute.

Does LNG compete with LPG anywhere in the market?

At the margin, in some heating and industrial applications. In countries where LPG dominates rural heating (parts of Europe, Southeast Asia), expanding LNG supply and infrastructure can substitute for LPG in some commercial uses. But the primary consumer markets are largely separate: LNG serves power generators, city gas networks, and large industrial users; LPG serves rural households, autogas, and petrochemical feedstock markets.

Why did European LNG prices spike so dramatically in 2022?

Russia supplied approximately 40% of the EU’s natural gas through pipelines (Nord Stream 1, Yamal pipeline, TurkStream) before the 2022 invasion of Ukraine. As the EU imposed sanctions and Russia cut or halted deliveries, Europe needed to replace an enormous volume of gas quickly. LNG was the only scalable alternative, but global LNG supply is relatively fixed in the short term — you cannot quickly build new liquefaction terminals. The scramble for available LNG cargoes drove JKM and TTF prices to record highs.

What is “LNG arbitrage” and why does it matter for shipping?

LNG arbitrage refers to the practice of routing LNG cargoes to wherever the price differential justifies the shipping cost. If Asian JKM prices are $5/MMBtu higher than TTF plus the incremental freight cost to divert from Europe to Asia, a cargo owner will redirect cargoes toward Asia. This arbitrage links regional LNG prices together, and the shipping market — specifically LNG carrier freight rates — is the mechanism that transmits price signals between regions. When arbitrage windows open, LNG carrier demand spikes, driving up day rates for LNG shipping.

Is there a global LNG futures market?

Yes, but it is less liquid than crude oil or European gas markets. CME Group and ICE both offer LNG futures contracts linked to JKM and other benchmarks. Singapore Exchange (SGX) offers JKM-linked derivatives. However, much of the LNG market still operates through long-term supply contracts (15–20 year agreements) that were historically oil-indexed rather than hub-priced. The market has gradually shifted toward more spot and short-term trading, with increasing use of JKM and TTF as pricing references, but the transformation is incomplete.

Key Takeaways

• LNG is liquefied natural gas — primarily methane, cooled to −162°C for bulk ocean transport, then regasified at destination for use as pipeline gas.
• LPG is liquefied petroleum gas — propane and/or butane — held liquid under moderate pressure at ambient temperature, used for residential heating, cooking, autogas, and petrochemicals.
• The key physical distinction: LNG requires cryogenic storage (−162°C); LPG requires only pressurisation at ambient temperature. This drives completely different ship types, terminal infrastructure, and handling costs.
• LNG benchmarks are JKM (Asia), TTF (Europe), and Henry Hub (US) — regionally differentiated prices that reflect the cost of transporting gas by LNG carrier between markets.
• The US shale revolution turned the US from an LNG importer into the world’s largest LNG exporter by 2023, with terminals at Sabine Pass, Corpus Christi, Freeport, Cameron, and Cove Point.
• The Russia-Ukraine energy crisis (2022) triggered a massive European shift from Russian pipeline gas to imported LNG, driving record JKM and TTF prices and accelerating European LNG import infrastructure investment.
• LNG bunkering — using LNG as fuel for ships — is a growing market driven by IMO 2020 sulphur regulations, with Rotterdam, Singapore, and Zeebrugge as leading bunkering hubs.
• LNG and LPG serve fundamentally different markets and should not be confused — understanding which compound you are discussing is essential for commodity and shipping analysis.

Related Reading

To deepen your understanding of the topics covered in this article, explore these related guides: the broader family of hydrocarbon liquids separated during gas processing and how gas-fired generation links these fuels to power pricing.