A Field With Two Decades of Documented Innovation

Marine current turbine (MCT) technology harnesses the kinetic energy of tidal streams, ocean currents, and deep-water flows to generate electricity — making it one of the most predictable and resource-dense segments of marine renewable energy. Patent activity in this dataset spans from 2007 to 2026, representing roughly two decades of documented MCT innovation across 15 directly relevant records and an additional 8 covering deployment infrastructure, grid integration, and sensor power applications.

The field divides into three primary sub-domains: submerged horizontal-axis turbine platforms for tidal and deep ocean current extraction; ducted or channeled turbine systems that accelerate flow to improve energy capture; and hybrid multi-source marine energy platforms that combine current turbines with wave, wind, or solar subsystems. Assignees range from university research groups — including National Taiwan University, Memorial University of Newfoundland, and Jiangsu University of Science and Technology — to commercial developers such as Aquantis Inc., Norwegian Tidal Solutions AS, Nova Innovation Ltd, and Energy Vault Inc.

The innovation timeline divides into three phases. The early/foundational phase (2007–2015) produced the first large-scale commercially oriented filing: Aquantis Inc.’s multi-megawatt ocean current extraction device (JP, 2014). The mid-stage development phase (2015–2021) introduced slidable duct-mounted turbine architectures for maintenance access (Norwegian Tidal Solutions AS, KR, 2019 and 2021) and small-scale rim turbine power units for oceanographic moorings (Memorial University of Newfoundland, CA, 2017). The recent/emerging phase (2021–2026) shows convergence toward hybrid integration, deep-water applications, and hydrogen co-production — with the most recent 2026 filings representing a qualitative shift in MCT objectives.

Four Technology Clusters Defining the MCT Patent Space

The 2026 MCT patent dataset resolves into four distinct technology clusters, each addressing a different engineering challenge in extracting power from marine currents. These clusters are not mutually exclusive — several recent filings draw on mechanisms from two or more clusters — but they represent coherent IP groupings with distinct assignee profiles.

Cluster 1: Submerged Multi-Rotor Platforms with Passive Depth Control

Buoyant submersible platforms carrying two or more rotor-generator pods maintain operational depth via hydrofoil wing depressors and mooring line geometry rather than active ballast. Rotors use fixed-pitch blades coupled to hydraulic pump drivetrains driving constant-speed generator sets, with pressure vessels housing all drivetrain components. Aquantis Inc. holds two JP filings (2014 and 2019) in this cluster, representing the first large-scale commercially oriented MCT filings in the dataset.

Cluster 2: Moored Floating and Pontoon-Based Turbine Structures

These systems use surface or near-surface floating bodies — pontoons and relay platforms — connected to seabed anchors via mooring cables, with turbine generators suspended at operational depth. A key innovation is single-anchor deployment to reduce construction cost, alongside adjustable winch mechanisms for depth control. National Taiwan University holds two US filings (2015 and 2021) in this cluster, transmitting DC power via submarine cable to land stations. Energy Vault Inc.’s 2026 JP filing adds a pontoon-mounted single-propeller underwater turbine targeting both grid power and hydrogen production.

Cluster 3: Ducted / Channeled Turbine Systems with Slide-Out Maintenance Access

This cluster employs a turbine house defining a flow duct that concentrates and accelerates the incoming current, within which the turbine device is mounted via slidable connecting members. This allows extraction for maintenance without full platform retrieval — addressing one of the most operationally costly challenges in submerged turbine deployment. Norwegian Tidal Solutions AS holds two KR filings (2019 and 2021) in this cluster, alongside a Halliburton Energy Services Inc. GB filing from 2019 covering a tidal caisson device.

Cluster 4: Seabed-Fixed Support Structures with Optimized Arm Geometry

Gravity- or caisson-founded support structures with asymmetrically arranged radial arms tuned to the predominant bi-directional tidal flow vector reduce over-engineering of lateral support and optimize material use. Nova Innovation Ltd’s 2023 GB filing introduces this asymmetric geometry specifically calibrated for bi-directional tidal flow. Jiangsu University of Science and Technology’s 2021 CN filing adds integral yaw mechanisms to align the seabed platform with current direction.

Geographic and Assignee Patterns: Japan Leads, No OEM Dominance

Japan leads all jurisdictions in MCT patent filings within this dataset, with 5 records covering Aquantis Inc., Energy Vault Inc., Jiangsu University of Science and Technology, Guangzhou Institute of Energy Conversion (Chinese Academy of Sciences), and Southeast University — suggesting that Japan’s filing system is being used extensively by both Chinese academic institutions and US commercial developers, likely via the PCT route. The UK and Korea each hold 2 records, with the UK confirming its position as the dominant European MCT jurisdiction in this dataset.

Among the top five assignees by filing breadth, no single organization dominates. National Taiwan University and Aquantis Inc. each hold 2 filings, as do Norwegian Tidal Solutions AS and Jiangsu University of Science and Technology. This contrasts sharply with offshore wind, where consolidation around a few large OEMs is well-documented by organizations such as IRENA and WIPO. The MCT space remains fragmented across a mix of academic and commercial assignees, with no equivalent of a GE or Siemens Gamesa staking out dominant IP positions.

“No major offshore wind OEMs — GE, Siemens Gamesa, or Vestas — appear in MCT-specific patent filings in this dataset, indicating either low commercial priority or undisclosed internal development and creating potential entry space for specialized developers or sovereign energy agencies.”

The absence of major OEMs is a structurally significant observation. According to IEA ocean energy tracking data, tidal stream capacity remains a fraction of offshore wind globally — which may explain why large OEMs have not yet committed to MCT-specific IP strategies. For specialized developers and sovereign energy agencies, this absence represents a meaningful window for IP positioning before potential OEM entry.

Hydrogen, Hybrids, and Asymmetric Foundations: Where MCT Is Heading

The most recent filings from 2023 to 2026 signal three clear directional shifts that define where marine current turbine innovation is heading — shifts that have significant implications for IP strategy, R&D investment, and freedom-to-operate analysis.

Hydrogen Co-Production Integration

Energy Vault Inc.’s 2026 JP filing for a pontoon-mounted single-propeller underwater turbine system explicitly targets grid power and hydrogen production as co-objectives — the first MCT filing in this dataset to embed hydrogen as a primary output. This reflects the broader green hydrogen policy environment being tracked by bodies including IRENA and signals that MCT technology is beginning to integrate with the emerging hydrogen economy rather than targeting electricity-only outputs.

Multi-Resource Hybrid Platforms

Two 2026 filings combine MCT with solar, wave, and thermal energy in single floating platforms, targeting continuous baseline power output by compensating for the intermittency of individual marine energy sources. Jiangsu University of Science and Technology’s 2026 JP filing integrates current energy with solar and hydrogen production in a single floating platform. Southeast University’s 2023 CN filing combines ocean thermal energy with tidal current in a joint power supply system. The Guangzhou Institute of Energy Conversion (Chinese Academy of Sciences) filed a complementary deep-sea multi-energy integration platform in 2022 (JP), targeting power generation, production, living, and exploration functions simultaneously.

This convergence means MCT IP portfolios will increasingly overlap with wave energy, ocean thermal energy conversion (OTEC), and hydrogen technology IP. IP strategists should map freedom-to-operate across all three domains before committing to hybrid platform development — a point reinforced by EPO guidance on multi-domain patent landscapes in energy technology.

Optimized Asymmetric Seabed Foundations for Bi-directional Flow

Nova Innovation Ltd’s 2023 GB filing introduces asymmetric radial arm geometry on seabed support structures, calibrated specifically for the dominant bi-directional tidal flow vector. This departs from symmetric multi-arm designs common in earlier seabed-fixed turbine installations and represents a maturation of site-specific structural optimization — reducing material use by avoiding over-engineering of lateral support in the non-dominant flow direction.

Strategic Implications for IP Teams and R&D Leaders

The 2026 MCT patent landscape surfaces five actionable strategic implications for IP professionals, R&D leaders, and technology strategists working in or adjacent to the marine energy sector.

• White space in large-scale moored platforms: Only two assignees — Aquantis Inc. and National Taiwan University — have filed on MW-scale floating current turbine architectures in this dataset. The absence of major OEMs creates potential entry space for specialized developers or sovereign energy agencies, particularly in jurisdictions where these assignees have not filed.
• Maintenance access as a core differentiator: Norwegian Tidal Solutions AS’s slidable duct-mount patents (KR, 2019 and 2021) address a fundamental operational challenge for submerged turbines. R&D teams should evaluate whether this maintenance architecture is broadly applicable to competing deployment designs or whether it represents a licensable proprietary advantage.
• Hybrid platform convergence requires multi-domain IP strategy: The emergence of combined tidal-thermal, tidal-wave, and tidal-solar-hydrogen platforms means MCT IP portfolios will increasingly overlap with wave energy, OTEC, and hydrogen technology IP. IP strategists should map freedom-to-operate across all three domains before committing to hybrid platform development.
• China and Japan are emerging MCT jurisdictions: Five of the 12 directly relevant records are filed in CN or JP by Chinese academic institutions, and the most recent 2026 filing is a JP-filed Chinese university patent. This signals a strategic shift toward Asia-Pacific markets and the PCT/JP route for international coverage by Chinese MCT innovators.
• Seabed sensor powering is an underserved near-term commercial niche: The Memorial University of Newfoundland rim turbine mooring unit (CA, 2017) represents a low-TRL-barrier application that avoids the cost and regulatory complexity of grid-connected systems. For early-stage MCT developers, sensor mooring power units offer a viable commercialization pathway before utility-scale deployment.

For teams building MCT-adjacent IP strategies, the PatSnap IP Intelligence platform and PatSnap R&D solutions provide the cross-domain patent mapping capabilities needed to navigate these overlapping technology spaces. The field’s relative immaturity — combined with the absence of dominant OEM players — means that well-timed, well-scoped patent filings can still establish meaningful IP positions in MCT core mechanisms and hybrid integration architectures.