Three Domains Defining the Offshore Hydrogen Patent Landscape
Offshore hydrogen production encompasses the integrated generation, storage, and export of hydrogen using energy resources available at sea. A dataset of 43 retrieved patent records spanning 2022–2024 reveals that the field divides into three technically distinct but operationally interlinked sub-domains: platform-integrated green hydrogen production, hydrogen storage and export logistics, and direct seawater electrolysis materials science.
All retrieved results reference electrolysis as the central hydrogen generation mechanism. Three electrolyzer configurations appear as distinct technical variants: proton exchange membrane (PEM), alkaline, and solid oxide (SOEC). Platform architectures range from fixed monopile foundations co-located with bottom-fixed wind turbines to semi-submersible or ship-hull floating structures designed for deepwater deployment.
This landscape is derived from 43 patent and literature records retrieved across targeted searches. It represents a snapshot of innovation signals within this dataset only and should not be interpreted as a comprehensive view of the full industry. All claims are traceable to the retrieved records.
Offshore hydrogen production patent activity across 2022–2024 spans three sub-domains: platform-integrated green hydrogen production using offshore wind and electrolysis; hydrogen storage, conversion, and export logistics including pipelines, LOHC, and ammonia; and direct seawater electrolysis using novel electrode materials and membrane architectures that eliminate the desalination step.
From Proof-of-Concept to Industrialisation: Three Waves of Patent Activity
Offshore hydrogen patent activity across 2022–2024 follows a clear three-wave pattern, with each wave introducing a new layer of technical sophistication — from foundational system designs to frontier materials science. Understanding these waves is essential for R&D teams benchmarking their position in the innovation cycle.
Wave 1 (2022): Foundational System Designs
Early filings in 2022 defined the wind-to-hydrogen integration concept, seawater desalination pre-treatment, and basic platform configurations. Subsea 7 Norway AS filed a foundational offshore green hydrogen production and export system (WO2022129471A1) covering electrolysis, water treatment, compression, and export via pipeline or carrier ship. Ming Yang Smart Energy Group Co., Ltd. contributed an offshore wind power combined hydrogen production system (CN114278490A) addressing the challenge of grid connection by converting excess electricity to hydrogen. Linde GmbH entered with two patents — one covering offshore green hydrogen and ammonia production (WO2022258549A1) and another integrating hydrogen production with CO₂ capture for blue hydrogen pathways (WO2022258548A1).
Wave 2 (2023): Rapid Industrialisation
The largest concentration of records falls in 2023, indicating rapid industrialisation of the concept. This period introduces floating platform architectures, combined wave-and-wind systems, FPSO-adapted hydrogen units, and the first dedicated seawater electrolysis electrode patents. Key assignees in this wave include Siemens Energy Global GmbH & Co. KG, Tractebel Overdick GmbH, Technip Energies France, TotalEnergies SE, and a dense cluster of Chinese universities and state-owned enterprises including China General Nuclear Power Corporation and State Power Investment Corporation.
“The largest concentration of offshore hydrogen patent records falls in 2023, indicating rapid industrialisation of the concept — floating platforms, FPSO-adapted units, and the first dedicated seawater electrolysis electrode patents all emerge in this single year.”
Wave 3 (2024): Frontier Directions
The most recent filings push two frontier directions: direct seawater electrolysis without desalination — exemplified by TotalEnergies SE’s WO2024133209A1 — and integrated offshore ammonia production as a hydrogen export vector, represented by Huaneng Clean Energy Research Institute’s CN117489524A. Subsea hydrogen storage also emerges as a distinct technical direction in 2024, with Saipem SpA’s EP4361432A1 describing compressed hydrogen storage in subsea pressure vessels or geological formations. According to WIPO, hydrogen-related patent families have grown substantially in recent years, consistent with the acceleration observed in this dataset.
Offshore hydrogen production patent activity follows three distinct waves: foundational system-level designs in 2022 (Subsea 7, Ming Yang, Linde); rapid industrialisation with floating platforms and FPSO-adapted units in 2023 (Siemens Energy, TotalEnergies, Technip Energies); and frontier directions in 2024 including direct seawater electrolysis without desalination and integrated offshore ammonia production as a hydrogen export vector.
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Explore the Patent Landscape in PatSnap Eureka →Platform Electrolysis — The Dominant Architecture
Wind-powered platform electrolysis with seawater desalination pre-treatment is the dominant architectural paradigm across the dataset, with more than half of all retrieved records belonging to this cluster. The core mechanism follows a consistent sequence: offshore wind turbine array → power conversion → seawater intake and reverse osmosis desalination → electrolyzer (PEM or alkaline) → hydrogen compression and storage on platform.
Fixed Platform Configurations
Siemens Energy Global GmbH & Co. KG holds two closely related filings — US20230243072A1 and WO2023169683A1 — both describing an offshore hydrogen production system that integrates an electrolyzer assembly directly on an offshore platform connected to wind energy conversion structures. Siemens Gamesa Renewable Energy Innovation & Technology S.L. advances this with WO2024022606A1, adding a dedicated seawater inlet assembly and desalination unit feeding the electrolysis hydrogen production unit. State Power Investment Corporation (SPIC) contributes a PEM-specific configuration (CN116043247A) with integrated desalination pre-treatment optimised for marine operating conditions. ThyssenKrupp Nucera AG & Co. KGaA filed EP4293142A1, integrating reverse osmosis desalination with alkaline electrolysis to minimise energy consumption and platform footprint.
Floating and FPSO-Type Platforms
A distinct architectural direction focuses on floating production units — analogous to oil and gas FPSO vessels — adapted for green hydrogen. Tractebel Overdick GmbH’s WO2023099026A1 describes a floating platform integrating wind and/or wave energy converters with an electrolysis plant, hydrogen compression, and storage for export. Technip Energies France contributed two complementary filings: WO2023237241A1 describes an FPSO unit integrating renewable energy generation, electrolysis, compression, storage, and offloading; WO2023241830A1 covers the associated carrier vessel for transporting hydrogen produced offshore in liquid form or as a chemical carrier. Ceres Intellectual Property Company Limited’s WO2024218126A1 describes an offshore hydrogen production platform with a buoyant structure and electrolysis system connectable to renewable energy sources.
Integrated offshore aquaculture-hydrogen platforms have also appeared in the dataset, with Guangdong Ocean University filing CN115012447A for a platform combining wind power generation, hydrogen production, and marine aquaculture — indicating that multi-use offshore infrastructure is an emerging design direction beyond pure-play hydrogen facilities.
Multi-Energy Source Configurations
Several patents extend beyond wind-only power inputs. Stiesdal Offshore A/S (WO2023147847A1) combines wave energy converters and wind turbines feeding a shared electrolysis system. H2Sea BV (WO2023017109A1) describes offshore hydrogen production powered by tidal and wave energy converters. Vestas Wind Systems A/S (EP4230839A1) integrates electrolysis directly into the base of offshore wind turbines, producing hydrogen using desalinated seawater and transporting it via pipeline to shore. According to the IEA, combining multiple marine renewable sources can improve electrolyzer utilisation rates — a key economic lever for offshore hydrogen projects.
The dominant offshore hydrogen production architecture identified across the 2022–2024 patent dataset integrates offshore wind turbines with onboard reverse osmosis desalination and PEM or alkaline electrolyzers on a fixed or floating platform. Key assignees in this cluster include Siemens Energy Global GmbH & Co. KG, Siemens Gamesa Renewable Energy Innovation & Technology S.L., ThyssenKrupp Nucera, Tractebel Overdick GmbH, and Technip Energies France.
Hydrogen Export Logistics: Pipelines, LOHC, and Ammonia
Hydrogen export is the critical value-chain link that determines whether offshore production is commercially viable, and the patent dataset identifies three distinct export modalities, each with its own technical and economic trade-offs: subsea pipelines, liquid organic hydrogen carriers (LOHC), and ammonia synthesis and tanker export.
Subsea Pipeline Export
Saipem SpA filed two complementary patents addressing subsea hydrogen infrastructure. EP4390116A1 describes an offshore hydrogen pipeline system for transporting hydrogen to onshore terminals, including safety systems for hydrogen embrittlement management, pressure management, and integrity monitoring. EP4361432A1 covers a subsea hydrogen storage system where hydrogen is compressed and stored in subsea pressure vessels or geological formations. Ørsted Wind Power A/S (WO2024052290A1) describes a system combining wind turbines, an electrolysis plant, and hydrogen storage means — with the storage option being subsea or on-platform — and export via pipeline or carrier vessel. RWE Offshore Wind GmbH (EP4353940A1) addresses offshore engineering challenges including marine corrosion, platform stabilisation, electrical integration, and safety in a pipeline-linked installation.
Liquid Organic Hydrogen Carriers (LOHC)
LOHC technology — which bonds hydrogen to an organic liquid for safe, high-density storage and ship-based transport — appears as a dedicated export pathway. Hydrogenious LOHC Technologies GmbH filed WO2024105017A1, describing a system for producing and exporting hydrogen using LOHC in an offshore setting, with ship-based transport to onshore dehydrogenation terminals. TotalEnergies SE’s WO2023180264A1 identifies LOHC as one of multiple export modalities alongside subsea pipelines, reflecting a multi-vector strategy. Standards bodies including ISO are actively developing hydrogen quality and transport standards relevant to LOHC deployment.
Ammonia as Hydrogen Carrier
Ammonia synthesis offshore — converting hydrogen and nitrogen into ammonia for tanker export — emerges as the third distinct export vector. Linde GmbH’s WO2022258549A1 describes a system integrating an electrolyzer, an air separation unit for nitrogen production, and an ammonia synthesis reactor, with ammonia used as the hydrogen energy carrier for transport. Huaneng Clean Energy Research Institute’s CN117489524A extends this to a fully integrated offshore system including a wind turbine array, seawater desalination unit, PEM electrolyzer, nitrogen plant, and ammonia synthesis unit on a single offshore platform. COSCO Shipping Heavy Industry Co., Ltd. contributed CN115432135A, describing an offshore floating hydrogen production and storage ship integrating renewable energy generation, electrolysis, and hydrogen liquefaction and storage equipment. The International Renewable Energy Agency (IRENA) has identified green ammonia as one of the most promising long-distance hydrogen export vectors, consistent with the patent activity observed in this dataset.
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Analyse Hydrogen Export Patents in PatSnap Eureka →Direct Seawater Electrolysis — The Frontier Materials Race
Direct seawater electrolysis — producing hydrogen from unprocessed seawater without a prior desalination step — represents the most technically ambitious sub-domain in the dataset and the area of most intense materials science activity. The core challenge is chloride management: seawater electrolysis generates chlorine at the anode as a competing reaction, which degrades electrodes and reduces selectivity for hydrogen evolution.
Electrode and Catalyst Engineering
Multiple assignees have filed distinct approaches to the chloride suppression problem. Shenzhen University (CN116397260A) uses a hydrophobic coating on the electrode to suppress chloride oxidation and preferentially generate hydrogen. Tianjin University (CN115404496A) uses modified electrode materials resistant to chloride attack during electrolysis. Nankai University (CN115142086A) engineered a catalyst material to suppress chlorine evolution and enhance hydrogen evolution. Heraeus Deutschland GmbH & Co. KG (EP4234768A1) developed a bifunctional electrocatalyst enabling hydrogen and oxygen evolution in seawater with selectivity over competing chloride oxidation reactions. Wuhan University of Technology (CN116446019A) integrated seawater-tolerant electrode materials with an offshore wind power system to eliminate desalination entirely.
Membrane and System-Level Approaches
Johnson Matthey PLC (WO2023083534A1) filed a membrane electrode assembly (MEA) with chloride-resistant catalyst layers and membrane materials for long-duration operation with saline feed water. The University of Melbourne (US20230220563A1) uses a gas-permeable membrane and a Lewis acid layer to prevent chloride penetration and allow selective hydrogen evolution. California Institute of Technology (US20240102189A1) employs selective ion exchange membranes to separate chloride from the electrolysis feed water, enhancing efficiency and electrode lifetime. Fraunhofer-Gesellschaft (WO2023213392A1) describes a novel electrode assembly tolerant to chlorine evolution and high salinity, enabling direct marine water hydrogen production. TotalEnergies SE’s WO2024133209A1 — the most recent in this cluster — uses a membrane or electrode assembly tolerant to seawater composition, eliminating the desalination step for an offshore hydrogen production system.
Electrolyzer Configurations for Marine Environments
Beyond electrode chemistry, several patents address system-level adaptation of electrolyzer types to marine conditions. Nel Hydrogen A/S (WO2024013337A1) designed an alkaline electrolyzer with saltwater-tolerant components, corrosion-resistant materials, and an integrated water purification stage. ITM Power PLC (WO2023186765A1) adapted a PEM electrolysis system for offshore deployment with pressure compensation mechanisms managing variable hydrostatic pressure. Bloom Energy Corporation (WO2022268994A1) describes a solid oxide electrolyzer (SOEC) for marine hydrogen production using high-temperature steam electrolysis, with integration with waste heat recovery from marine operations. Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CN116575078A) developed an electrolysis system with enhanced corrosion resistance using novel electrode materials and stack configurations designed for marine environmental conditions including humidity, saltwater exposure, and temperature variations. Research published via Nature has highlighted direct seawater electrolysis as a rapidly advancing field, with catalyst selectivity and membrane durability identified as the key remaining technical barriers.
Direct seawater electrolysis for offshore hydrogen production eliminates the energy and capital cost of reverse osmosis desalination by using novel electrode materials and membrane architectures that suppress chloride oxidation. Active patent assignees in this sub-domain include Shenzhen University, Tianjin University, Nankai University, Johnson Matthey PLC, the University of Melbourne, California Institute of Technology, Fraunhofer-Gesellschaft, and TotalEnergies SE.
Strategic Implications for R&D and IP Teams
The offshore hydrogen patent landscape in 2026 presents distinct strategic signals for R&D leaders, IP counsel, and corporate development teams across the energy and maritime sectors. Three observations stand out from the dataset.
1. The Platform Architecture Is Converging — Differentiation Is Moving to Components
The system-level architecture of offshore wind-to-hydrogen production — wind array, desalination, electrolyzer, compression, storage, export — is now well-established across multiple assignees. The innovation frontier has shifted to component-level optimisation: electrode materials, membrane assemblies, pressure compensation systems, and corrosion-resistant stack configurations. Teams still filing broad system-level claims face a crowded prior art landscape; component-level differentiation offers more defensible white space.
2. Chinese State-Owned Enterprises and Universities Are a Significant Filing Force
Chinese assignees — including China General Nuclear Power Corporation, COSCO Shipping Heavy Industry, China State Shipbuilding Corporation (CSSC), PowerChina Huadong Engineering, Huaneng Clean Energy Research Institute, and multiple universities including Shenzhen, Tianjin, Nankai, and Wuhan University of Technology — represent a substantial proportion of the dataset. This reflects both China’s strategic prioritisation of offshore wind and hydrogen and the maturity of its domestic R&D ecosystem in this space. Teams monitoring freedom-to-operate should include CN-jurisdiction filings in their landscape analysis. PatSnap’s innovation intelligence resources provide guidance on navigating multi-jurisdictional patent landscapes.
3. Export Modality Selection Is a Strategic Decision with IP Implications
The three export pathways — subsea pipeline, LOHC, and ammonia — each carry distinct IP landscapes, infrastructure requirements, and regulatory frameworks. The choice of export modality shapes which patent families are relevant to freedom-to-operate analysis and which technology partnerships may be required. Teams at early project development stages should conduct export-modality-specific landscape analysis before committing to a design direction. The PatSnap platform enables segmented landscape analysis by technology sub-domain and jurisdiction to support these decisions.
“The patent dataset reflects a field transitioning from proof-of-concept system designs toward component-level optimisation and export logistics — characteristic of a technology at a mid-to-late TRL 4–6 stage across many sub-domains.”
4. Blue Hydrogen and CO₂ Capture Remain a Parallel Track
While green hydrogen dominates the dataset, blue hydrogen pathways — producing hydrogen from natural gas with CO₂ captured and stored in offshore geological formations — appear in filings from Linde GmbH (WO2022258548A1) and Equinor Energy AS (WO2023247820A1). Equinor’s filing specifically addresses repurposing offshore oil and gas infrastructure for hydrogen production, a commercially significant pathway given the existing asset base in the North Sea and other mature offshore basins. According to the IEA, blue hydrogen from offshore gas fields with carbon capture represents a near-term bridge technology while green hydrogen costs continue to fall.