From LNG Imports to Nationwide Pipelines and City Gas Retail in South Korea, a 100% Gas-Importing Nation

The first fact to grasp when looking at Korea’s gas industry is simple: the country imports 100% of its natural gas. That means this is not an extractive industry digging resources out of the ground. It is entirely about who brings the gas in, where it is stored, how it is regasified, which pipelines carry it, and ultimately which households and factories in which regions it is sold to. KOGAS sits at the center, controlling LNG imports, receiving terminals, and the nationwide trunk pipeline network. Around that core, POSCO International’s direct imports and Gwangyang LNG Terminal, along with SK Gas and E1’s LPG import and distribution businesses, each shape the market from different positions. At the very end of the chain, Samchully, Seoul City Gas, Daesung Energy, Incheon City Gas, and GSE connect gas to homes under regional monopoly structures.

The reason Korea’s gas value chain matters right now is that, as LNG expands its share in power generation as a bridge fuel between coal, nuclear, and renewables, both import competition and the value of infrastructure are being reassessed at the same time. That said, it would be a mistake to read this industry as a simple growth story. City gas is a low-growth utility business operating under regulated tariffs, and KOGAS carries the heavy burden of uncollected receivables and losses from overseas projects. Over the longer term, LNG will also find it hard to avoid decline pressure under the carbon-neutral transition. It is an industry with high stability, but a clear ceiling on growth. You need to see both sides to read it properly.

Imports · Trading · Infrastructure — Bringing Gas into the Country (4 companies)

The import, trading, and infrastructure segment is the heart of Korea’s gas industry. KOGAS is effectively the infrastructure monopoly, handling LNG imports, receiving terminals, and the nationwide trunk pipeline network. That said, imports themselves are no longer the absolute monopoly they once were. Private direct imports have climbed to around 26%, creating a more competitive landscape. This is exactly where POSCO International has been building its presence. Its chain of LNG direct imports, the Myanmar gas field, the Gwangyang LNG Terminal and second terminal in 2026, and LNG power generation makes it a core pillar of the LNG value chain within the POSCO Group. This is where you can see Korea’s gas market slowly shifting from a single state-owned structure to a multi-player one.

You also can’t leave out the two heavyweight LPG players. SK Gas is Korea’s No. 1 LPG importer and distributor with roughly 43% market share, and it is broadening its portfolio by adding LNG-hydrogen combined power generation and Korea Energy Terminal (KET). E1, an LS Group affiliate, is Korea’s No. 2 player in LPG imports, filling, and distribution, with about 29% market share. If you’re wondering why LPG is being discussed alongside natural gas, the answer is simple: Korea’s gas energy landscape fundamentally runs on logistics, storage, and distribution capabilities across imported gases as a whole. The most accurate way to view Korea’s gas import segment is as a structure built on KOGAS’s monopoly over pipeline infrastructure, overlaid with POSCO International’s direct LNG imports and the SK Gas–E1 duopoly in LPG.

Company	Core business
KOGAS	LNG imports · receiving terminals · nationwide trunk pipeline network — infrastructure is effectively monopolized (imports face competition from private direct imports at ~26%)
POSCO International	Direct LNG imports · Myanmar gas field · Gwangyang LNG Terminal (second terminal in 2026) · LNG power generation — core of POSCO’s LNG value chain
SK Gas	Korea’s No. 1 LPG importer and distributor (~43%) + LNG-hydrogen combined power generation (Korea Energy Terminal, KET)
E1	Korea’s No. 2 LPG importer, filler, and distributor (~29%) — LS Group

City Gas Retail — Regional Monopolies Reaching Every Household (5 companies)

City gas retail is the segment closest to everyday life, but from an investment perspective, it’s also the one that needs the coldest assessment. Each operator moves within an exclusive regional franchise. Samchully ranks No. 1 in city gas supply volume with roughly a 16% share, covering Gyeonggi and Incheon while also operating district energy and power generation businesses. Seoul City Gas supplies western and northwestern Seoul as well as parts of Gyeonggi such as Goyang and Gimpo, while Daesung Energy is a spun-off subsidiary of Daesung Holdings serving Daegu and North Gyeongsang. Incheon City Gas covers northern, western, and central Incheon, and GSE serves about 48% of the area in South Gyeongsang, including Jinju and Sacheon. The market is finely divided by region, but the essence is the same. This is a classic regulated utility business: lay pipelines, then recover the investment steadily over a long period.

Put kindly, it’s defensive in a downturn. Put bluntly, it’s far from a high-growth story. Under a regulated tariff system, even if sales volume rises, profits are unlikely to surge explosively. Residential and commercial demand provide a floor, but this is not an industry with a dramatic expansion narrative. That’s why trying to read city gas companies like growth stocks keeps leading to the wrong conclusion. The right lens is stability, dividends, regional franchise strength, and operating efficiency. City gas retail clearly has an entry barrier in the form of regional monopoly rights, but it is equally clearly a low-growth utility with margins capped by regulated pricing.

Company	Core focus
Samchully	No. 1 in city gas supply volume (~16%, Gyeonggi/Incheon) + also operates district energy and power generation
Seoul City Gas	City gas — western/northwestern Seoul + Gyeonggi (Goyang, Gimpo, etc.)
Daesung Energy	City gas — Daegu/North Gyeongsang (spun-off subsidiary of Daesung Holdings)
Incheon City Gas	City gas — northern, western, and central Incheon
GSE	City gas — South Gyeongsang (~48% of area including Jinju and Sacheon)

LNG & Gas Instrumentation Components — Precision Parts That Connect the Piping (3 companies)

You only get half the picture if you talk about the gas and LNG value chain without fittings and valves. Pipes and equipment are large; connectors are small. But in the field, a single small component can determine safety and reliability. Hy-Lok is Korea’s No. 1 player in instrumentation fittings and valves, with applications spanning shipbuilding, petrochemicals, LNG, and semiconductors. DK-Lok manufactures DK-Lok instrumentation fittings and valves, and has expanded its end markets into hydrogen, LNG carriers, semiconductors, and nuclear power, with exports accounting for roughly 76% of sales. BMT has carved out its position across semiconductors, hydrogen, and LNG on the back of ultra-high-purity (UHP) fittings, valves, and tubes.

What makes this segment interesting is that it is not tied solely to domestic city gas demand growth in Korea. As LNG carriers increase, hydrogen facilities are built out, and demand expands for semiconductors and ultra-high-purity piping, these companies can move on a very different trajectory from Korea’s utility regulation cycle. Even within the gas industry, this is the most manufacturing-driven segment and the one closest to being an export industry. The real appeal of fitting and valve makers lies not in Korea’s domestic city gas market, but in their export scalability into LNG carriers, hydrogen, and semiconductors.

Company	Core focus
Hy-Lok	Korea’s No. 1 instrumentation fittings and valves maker — shipbuilding, petrochemicals, LNG, semiconductors
DK-Lok	Instrumentation fittings (DK-Lok) and valves — hydrogen, LNG carriers, semiconductors, nuclear power (exports ~76%)
BMT	Ultra-high-purity (UHP) fittings, valves, and tubes — semiconductors, hydrogen, LNG

What to Watch Going Forward

The next phase ahead is relatively clear. On the procurement side, competition from private direct imports will keep chipping away at the KOGAS-centered structure. Moves such as POSCO International’s direct imports and the expansion of the Gwangyang LNG Terminal, along with SK Gas’s LNG-hydrogen combined power projects and KET, point clearly in that direction. On the equipment side, LNG carriers and hydrogen are emerging as new sources of demand. Companies handling precision instrumentation components, such as Hy-Lok, DK-Lok, and BMT, may become more sensitive to the global capex cycle than to Korea’s regulated utility market. In other words, not every part of the gas industry moves at the same speed.

That said, this is no time to get carried away. City gas still operates under regulated tariffs, and KOGAS continues to bear the burden of uncollected receivables and losses from overseas projects. Over a longer horizon, LNG itself is not immune to decarbonization pressure. A bridge fuel is, by definition, only a bridge—not necessarily a permanent lead player. That is why Korea’s gas industry is both a business of stability and cash flow, and at the same time one that is highly sensitive to structural shifts and policy changes. The key battleground over the next few years will be direct-import competition and the expansion of LNG carriers and hydrogen facilities, but over the long run, the companies most likely to survive are those that can withstand regulated tariffs, uncollected receivables, and carbon-neutrality pressure.

※ This article is based on publicly available materials cross-checked online to organize company names, core businesses, and market positions, and some assessments reflect the author’s own views. It is not intended as a direct basis for investment decisions.

Written: July 2026. Ealexandro