Europe’s pipeline companies — officially known as Transmission System Operators (TSOs) — form the backbone of the continent’s gas and energy security infrastructure, operating over 100,000 kilometres of high-pressure pipelines that move natural gas, LNG, hydrogen and CO₂ between import terminals, storage facilities, industrial users and national distribution networks. In 2026, pipeline companies in Europe are navigating a dual mandate: maintaining the gas supply security that REPowerEU made critical after the loss of Russian pipeline volumes, while simultaneously repurposing their networks for hydrogen and carbon capture transport. This ranking covers the ten largest pipeline companies in Europe by revenue, network scale and strategic market position.
How We Ranked the Top 10 Pipeline Companies in Europe
European pipeline companies are predominantly regulated Transmission System Operators (TSOs) — infrastructure utilities whose revenue is set by national regulators on a regulated asset base (RAB) model rather than market forces. Ranking is based primarily on revenue scale and total pipeline network length, with additional weight given to international footprint, strategic significance within the European gas grid, and active investment in new molecule transport (hydrogen, CO₂, biomethane). European TSOs are coordinated through ENTSOG (the European Network of Transmission System Operators for Gas), which OGSN has profiled as a key governance body for European gas infrastructure.
1. Snam — San Donato Milanese, Italy
Snam is Europe’s largest gas infrastructure company by total network length, operating approximately 32,926 km of pipelines in Italy alone as of end-2024, with 62 billion cubic metres transported annually. Including international assets through stakes in Austria (TAG, GCA), Albania (AGSCo), Greece (DESFA), France (Teréga), UK (Interconnector UK) and the UAE (ADNOC Gas Pipelines), Snam’s total network reaches over 41,000 km. The company is also Europe’s largest gas storage operator, with approximately 20 bcm of storage capacity across its network.
In April 2025, Snam acquired a 24.99% stake in Open Grid Europe (OGE) — Germany’s largest independent gas transmission network — for €920 million from Abu Dhabi Investment Authority, closing in Q3 2025. The deal, valued at approximately 12x OGE’s 2025 EBITDA, cements Snam’s position as a pan-European multi-molecule infrastructure operator connecting Southern and Northern Europe. Snam’s 2026–2030 strategic plan specifically targets the key EU hydrogen corridors from Italy through Austria and Germany.
2. GRTgaz — Paris, France
GRTgaz is France’s gas transmission system operator and one of Europe’s largest pipeline companies by network length, operating 32,500 km of pipelines and transporting approximately 640 TWh of gas annually. A subsidiary of Engie, GRTgaz employs around 3,000 people and generated approximately €2.3 billion in turnover. Through its subsidiaries — including Elengy (Europe’s leading LNG terminal services operator) and GRTgaz Deutschland (operator of the MEGAL network in Germany) — GRTgaz spans multiple European markets.
GRTgaz is a founding member of the European Hydrogen Backbone initiative and is co-developing the BarMar hydrogen corridor with Enagás and Teréga, linking Spain and France via a subsea pipeline. GRTgaz also holds a significant stake in Teréga, the Southwest France TSO, giving it coverage of the Spanish border interconnection points that are central to Southern Corridor gas flows from Algeria and LNG terminals at Fos-sur-Mer.
3. Gasunie — Groningen, Netherlands
Gasunie is a Dutch state-owned energy infrastructure company operating one of Europe’s largest high-pressure pipeline networks, with over 17,000 km of pipeline across the Netherlands and northern Germany through its subsidiaries Gasunie Transport Services (GTS) and Gasunie Deutschland. Gasunie is the operator of the TTF (Title Transfer Facility) — Europe’s most liquid gas trading hub — making it structurally central to European gas price formation and market balancing.
Gasunie is a central participant in the European Hydrogen Backbone, with plans to develop a dedicated hydrogen transport network across the Netherlands connecting import infrastructure at Rotterdam and Groningen to German industrial consumers. The Wilhelmshaven Coastal Line hydrogen backbone runs through Gasunie’s northern German network.
4. Enagás — Madrid, Spain
Enagás is Spain’s national gas transmission operator and one of Europe’s most significant pipeline companies, operating Spain’s national gas grid plus four LNG import terminals at Huelva, Barcelona, Cartagena and Gijón — making it both the country’s pipeline and LNG gateway operator. Enagás generated approximately €1.34 billion in revenue in its most recent reported year and employs around 1,500 people.
In February 2025, Enagás announced plans to invest $4.7 billion by 2030, with $3.67 billion earmarked specifically for hydrogen infrastructure — the most aggressive hydrogen pivot in the European TSO sector by proportion of capex. Its headline project is the H2Med corridor, a proposed submarine hydrogen pipeline connecting Spain, Portugal, France and Germany. Enagás sold its 30.2% stake in US pipeline operator Tallgrass Energy to Blackstone for $1.1 billion in 2024, recycling the proceeds directly into European hydrogen investment.
5. Fluxys — Brussels, Belgium
Fluxys is Belgium’s gas transmission and infrastructure group, operating approximately 28,000 km of pipelines across Belgium, Germany, the Netherlands, UK, Greece, Switzerland, France, Albania, Portugal, Brazil, Chile and Oman — making it one of the most internationally distributed pipeline companies in Europe by geography. Fluxys operates the Zeebrugge LNG terminal, a critical entry point for LNG into Northwest Europe, and holds LNG terminal interests with a combined annual regasification capacity of 485 TWh.
In mid-2025, Fluxys Belgium, Pipelink and Air Liquide launched Fluxys c-grid Antwerp — a joint venture constructing a CO₂ pipeline network in the Antwerp port area to connect industrial emitters to permanent underground storage. Fluxys is also developing Belgium’s national hydrogen transmission network through its subsidiary Fluxys hydrogen, appointed by the Belgian regulator as the official hydrogen TSO in April 2024. The 2026 European gas storage outlook underscores why infrastructure operators like Fluxys remain central to continental energy security.
6. Open Grid Europe (OGE) — Essen, Germany
Open Grid Europe is Germany’s largest independent natural gas transmission network operator, running over 12,000 km of pipelines that handle approximately 21 billion cubic metres of gas annually and serve more than 400 end customers through 17 interconnections to seven neighbouring countries. OGE sits at the heart of Central European gas transit — physically connecting Germany’s import infrastructure (including LNG terminals at Wilhelmshaven and Brunsbüttel) with distribution networks in the Netherlands, Belgium, France, Switzerland, Austria, Czech Republic and Denmark.
As of Q3 2025, OGE’s ownership includes Snam (24.99%), Fluxys (24.99%), Gasunie (10%), and ADIA (via Vier Gas Holding). OGE is a primary participant in the development of Germany’s national hydrogen backbone, with its network forming the core of the North Sea–Ruhr hydrogen corridor linking North Sea import terminals to the Ruhr industrial region from 2027.
7. Gassco — Stavanger, Norway
Gassco is the Norwegian state-owned operator of the Gassled joint venture — Europe’s most strategically significant offshore gas pipeline network, transporting natural gas from the Norwegian Continental Shelf to terminals in Germany (Dornum/EUROPIPE), the UK (St Fergus via Langeled, FLAGS and Vesterled), Belgium (Zeebrugge via Zeepipe/Norpipe) and France (Dunkirk via Franpipe). Gassco’s remit is unique among European pipeline companies: it operates infrastructure owned by the Gassled partners (including Equinor, Total, Shell and the Norwegian state), functioning as a pure operator rather than an infrastructure owner.
The Norwegian offshore network transported approximately 115 billion cubic metres of gas to Continental Europe and the UK in 2024, making Norway the single largest pipeline gas supplier to Europe. Gassco is also the architect for new gas infrastructure development on the Norwegian continental shelf, giving it a strategic development role beyond mere operations.
8. National Gas Transmission — Warwick, United Kingdom
National Gas Transmission (formerly National Grid Gas Transmission) is the operator of Great Britain’s high-pressure gas transmission network — approximately 7,660 km of pipelines carrying gas from entry points including St Fergus (Norwegian gas), Bacton (Dutch and Norwegian gas), Isle of Grain LNG and Milford Haven LNG to distribution networks and industrial users across England, Scotland and Wales. National Gas Transmission was separated from National Grid plc in 2023 when National Grid sold its UK gas transmission business to a consortium led by Macquarie Asset Management.
The UK network is central to European gas market balancing through the Interconnector UK (IUK) pipeline to Belgium and the BBL pipeline to the Netherlands, which allow bidirectional gas flows between the UK and Continental markets.
9. GAZ-SYSTEM — Warsaw, Poland
GAZ-SYSTEM is Poland’s national gas transmission operator, managing approximately 11,700 km of high-pressure pipelines and operating as a critical transit and distribution link between the Baltic LNG import infrastructure (including the Świnoujście LNG terminal) and Polish domestic demand, as well as onward connections to Ukraine, Slovakia and the Czech Republic. GAZ-SYSTEM’s strategic importance has grown significantly since 2022 following the cessation of Russian gas flows via Yamal-Europe.
In 2026, construction is underway on the Baltic Pipe expansion and the new Gdańsk FSRU terminal, with commissioning targeted for 2028. GAZ-SYSTEM is a full member of the European Hydrogen Backbone initiative and is developing interconnection with Germany’s hydrogen backbone for post-2030 hydrogen import flows.
10. Exolum — Madrid, Spain
Exolum (formerly CLH) operates Spain’s primary liquid fuels pipeline network — a system of over 4,000 km of petroleum product pipelines connecting refineries, import terminals and distribution depots across the Spanish mainland and Canary Islands. Distinct from Enagás (which handles natural gas), Exolum’s pipeline network moves refined petroleum products — diesel, petrol, jet fuel and heating oil — making it the dominant liquid fuels pipeline operator in the Iberian Peninsula and one of the most specialised pipeline companies in Europe by product type.
Outside Spain, Exolum operates petroleum product pipelines and terminal assets in Germany, UK and Ireland, and won the contract to operate aviation fuel infrastructure at Paris-Charles de Gaulle airport from mid-2025. Its JV with Vopak at the Houston ammonia terminal signals Exolum’s expansion into new energy carriers beyond its traditional petroleum product base.
Pipeline Companies Europe: 2026 Outlook
Every operator in this ranking of pipeline companies in Europe is actively developing hydrogen transport capability alongside its existing gas network. The European Hydrogen Backbone — a 23,000 km dedicated hydrogen network planned for 2040, with an initial 6,800 km by 2030 — is being built by the same TSOs that operate today’s gas grid, with 75% of the future hydrogen network consisting of repurposed natural gas pipelines. According to ENTSOG’s latest network development reports, cross-border hydrogen capacity planning is already underway across all major European corridors.
Key 2026 milestones include the start of construction on Germany’s hydrogen backbone (OGE, Gasunie, Fluxys), Enagás’s $4.7 billion hydrogen investment programme, and the first CO₂ pipeline networks in Belgium and Netherlands connecting industrial emitters to CCS export terminals. For context on how Europe’s gas storage infrastructure connects to this pipeline network, see our analysis of underground gas storage as Europe’s energy insurance policy. Europe’s pipeline companies are not winding down — they are repositioning as the transmission infrastructure for a decarbonising energy system.
Which are the largest pipeline companies in Europe in 2026?
The largest pipeline companies in Europe in 2026 are Snam (Italy, 41,000km+ total network), GRTgaz (France, 32,500km), Gasunie (Netherlands, 17,000km+), Enagás (Spain), Fluxys (Belgium, 28,000km across 12 countries), Open Grid Europe (Germany, 12,000km), Gassco (Norway, offshore network), National Gas Transmission (UK), GAZ-SYSTEM (Poland, 11,700km) and Exolum (Spain, liquid fuels). Together, the Big Four TSOs — Snam, GRTgaz, Enagás and Fluxys — own over 100,000km of pipelines collectively.
What is a Transmission System Operator (TSO) in Europe?
A Transmission System Operator (TSO) is the regulated entity responsible for operating high-pressure gas or liquid fuels transmission networks within a country. European gas TSOs are unbundled from gas producers and traders under EU energy law, meaning they operate as neutral infrastructure providers for all market participants. They are coordinated at the European level by ENTSOG (European Network of Transmission System Operators for Gas), which oversees cross-border capacity planning, security of supply and network development.
How is the European pipeline network being adapted for hydrogen in 2026?
Europe’s major TSOs are repurposing existing natural gas pipelines for hydrogen transport as part of the European Hydrogen Backbone initiative — a plan to create a 23,000 km dedicated hydrogen transmission network by 2040, of which 75% will consist of converted gas pipelines. Key 2026 milestones include the start of construction on Germany’s national hydrogen backbone (OGE, Gasunie, Fluxys), Enagás’s $4.7 billion hydrogen investment programme in Spain, and the development of cross-border hydrogen corridors including H2Med (Spain-France-Germany) and the Wilhelmshaven Coastal Line (northern Germany).
Why is Snam the largest pipeline company in Europe?
Snam is the largest European pipeline company by total network length because it combines Italy’s entire national high-pressure gas transmission network (32,926km) with international stakes in gas infrastructure in Austria, Albania, Greece, France, UK and the UAE — bringing its total network to over 41,000km. In April 2025, Snam further extended its European reach by acquiring a 24.99% stake in Open Grid Europe (Germany’s largest independent gas network, 12,000km) for €920 million, cementing its position as the continent’s leading pan-European gas infrastructure operator.
What role do European pipeline companies play in LNG import infrastructure?
Europe’s major pipeline TSOs are closely integrated with LNG terminal operations: Enagás operates Spain’s four LNG import terminals; Fluxys operates the Zeebrugge LNG terminal in Belgium; GRTgaz controls Elengy, Europe’s leading LNG terminal services subsidiary; Snam holds stakes in Italian regasification terminals; and Gassco operates offshore pipelines connecting Norwegian production to UK LNG and gas entry points. This integration means European pipeline companies control both the reception points for LNG and the onward distribution networks — making them central actors in Europe’s post-Russian gas energy security architecture.