Extended Operational and Trade Vocabulary

Ocean Energy Beyond Wind glossary

The marine-renewable and CCS vocabulary beyond fixed offshore wind: tidal-stream turbine active yaw, named tidal and wave-energy demonstration projects, carbon capture and storage projects reusing depleted reservoirs, and the energy-cluster and demonstration terms. Grounds each term in the marine-energy device or the CCS project it names.

423 defined terms.

Showing 250 on this page (page 1 of 2).

A

Acorn Project: Proposed carbon capture and storage project in northeast Scotland that would reuse the Goldeneye pipeline to inject CO2 into depleted gas reservoirs and saline aquifers beneath the North Sea.
Active yaw (tidal turbine): Mechanism allowing a horizontal-axis tidal stream turbine to rotate its rotor into alignment with the flow direction on each tide.
Aderyn Mor: Demonstration tidal stream project planned off Anglesey, Wales by Minesto using its Dragon kite technology.
AECC: Aberdeen Energy and Climate Change cluster, an industrial grouping in northeast Scotland focused on energy transition projects including CCS and offshore hydrogen.
Aegir Wave Power: Joint venture formed in Shetland by Pelamis Wave Power and Vattenfall to develop a wave farm prior to Pelamis going into administration.
Aker BP: Norwegian exploration and production company that is a partner in several offshore CCS license areas on the Norwegian Continental Shelf.
Aker Carbon Capture: Norwegian carbon capture technology provider that supplies amine-based capture units feeding offshore CO2 storage projects.
Aker Solutions: Norwegian engineering contractor that delivers subsea injection systems and topsides for offshore CCS hubs including Northern Lights.
Algae cultivation at sea: Cultivation of macroalgae or microalgae in open water arrays, sometimes proposed as a co-located use of ocean energy sites.
Alpha Ventus: First German commercial offshore wind farm, commissioned in the North Sea in 2010.
Alstom Oceade: 1.4 MW horizontal-axis tidal stream turbine developed by Alstom and tested at EMEC, later transferred to General Electric.
Amine solvent: Chemical absorbent used at onshore capture plants whose recovered CO2 stream is shipped or piped to offshore storage sites.
Anchor handling tug supply vessel: Offshore support vessel class used to set moorings for floating tidal, wave, and floating solar platforms.
Andritz Hydro Hammerfest: Norwegian subsidiary of Andritz Hydro that developed the HS1000 tidal stream turbine deployed at EMEC and licensed for the MeyGen project.
Annapolis Royal Generating Station: 20 MW tidal barrage on the Annapolis River in Nova Scotia, Canada, commissioned in 1984 and decommissioned in 2019.
Aquamarine Power: Scottish wave energy developer behind the Oyster oscillating wave surge converter that entered administration in 2015.
AquaVentus: North Sea initiative led by German and European partners to develop offshore wind to hydrogen production around Helgoland.
Aramis: Dutch offshore CO2 transport and storage project sharing North Sea seabed corridors with offshore wind cable routes.
Arklow Bank: Irish Sea offshore wind farm, the first commercial offshore wind project in Ireland.
Array cable (marine renewable): Inter-device cable connecting tidal or wave converters to an offshore hub before export to shore.
Atlantic Marine Energy Test Site: AMETS, a wave energy test site located off Belmullet in County Mayo, Ireland, operated by the Sustainable Energy Authority of Ireland.
Atlantis Resources: Tidal stream developer that led the MeyGen project in the Pentland Firth and was later renamed SAE Renewables.
Attenuator (wave device): Wave energy converter that floats parallel to wave propagation and extracts energy from relative motion between hinged segments, exemplified by Pelamis.
Availability factor (marine renewable): Fraction of time a tidal or wave device is technically capable of generating, a key metric reported at EMEC and MeyGen.
Axial flow tidal turbine: Horizontal-axis tidal stream turbine in which flow passes parallel to the rotor shaft, the dominant architecture used by SAE Renewables and Andritz Hydro Hammerfest.

B

Bacton terminal: UK gas terminal on the Norfolk coast studied as a potential CO2 import and reuse hub linked to southern North Sea storage.
Barge-mounted PV: Floating photovoltaic configuration in which solar panels are installed on shallow-draft barges, used in early nearshore pilots.
Barrage (tidal): Civil engineering structure spanning an estuary or bay, fitted with low-head turbines and sluices to generate from tidal range, as at La Rance and Sihwa.
Bathymetric survey: Seabed depth mapping campaign required for siting tidal arrays, wave farms, CO2 injection wells, and subsea hydrogen pipelines.
Bay of Fundy: Tidal range region between New Brunswick and Nova Scotia, host to the FORCE tidal energy test center and earlier Annapolis Royal scheme.
Bayou Bend CCS: Offshore carbon storage project on the US Gulf Coast led by Chevron, Talos Energy, and Equinor offshore Jefferson and Chambers counties, Texas.
Beatrice Demonstrator: Early offshore renewable installation in the Moray Firth used as reference for combined wind, tidal, and hydrogen studies.
Bell Pirelli OTEC: Early ocean thermal energy conversion concepts associated with Alexander Graham Bell collaborators and later Italian engineering studies, often cited in OTEC history.
Bidirectional turbine: Low-head hydroturbine able to generate on both flood and ebb tides, central to modern tidal range designs.
Biofouling: Accumulation of organisms on submerged surfaces.
Black-start capability: Ability to restart the plant without external power.
Blue Economy: Sustainable use of ocean resources for economic growth.
Blue Hydrogen: Hydrogen from fossil sources combined with carbon capture and storage.
Blue X: Half-scale wave energy converter built by Mocean Energy and tested at EMEC in Orkney.
Bombora Wave Power: Australian wave energy developer of the mWave membrane converter, with project pipelines in Wales and Spain.
Borssele: Dutch offshore wind zone containing Borssele I and II (Orsted), III and IV (Blauwwind consortium), and V (innovation site).
Bottom-fixed wave device: Wave energy converter anchored or piled to the seabed in shallow water, including oscillating wave surge converters.
Bremerhaven: German port and industrial cluster supporting offshore wind logistics and increasingly green hydrogen demonstrators.
Brent field: Decommissioned North Sea oil and gas field referenced as a potential candidate for CO2 storage studies.
Buoy-mounted point absorber: Compact wave energy converter that uses heaving motion of a buoy relative to a reaction structure, exemplified by CorPower Ocean.

C

Cable burial: Protective trenching of subsea cables for tidal, wave, and floating solar export systems to reduce snag risk from fishing gear.
Cape Sharp Tidal: Bay of Fundy tidal energy project that deployed an OpenHydro turbine at the FORCE test site before parent company insolvency.
Capital expenditure intensity: Capex per installed megawatt, often higher for tidal and wave systems than for offshore wind during early commercialization.
Capture rate (CCS): Percentage of CO2 in a flue gas stream removed by a capture plant before transport to offshore storage.
Carbon dioxide carrier: Specialized ship designed to transport liquefied CO2 from onshore capture sites to offshore injection terminals.
Carnegie Clean Energy: Australian wave energy developer of the CETO submerged buoy system.
Cavitation (tidal turbine): Formation of vapor cavities on rotor blades at high tip speeds in tidal streams, a design constraint for blade geometry.
CCS hub: Shared transport and storage infrastructure aggregating CO2 from multiple emitters into a common offshore sink.
CCUS: Carbon capture, utilization, and storage, the broader policy category that includes offshore storage projects.
CETO: Submerged buoy wave energy converter developed by Carnegie Clean Energy and tested off Garden Island, Western Australia.
Channel Islands tidal resource: High tidal stream resource around Alderney and adjacent waters, subject of multiple feasibility studies.
Cherbourg: French port that hosted OpenHydro manufacturing and is involved in tidal and offshore renewable supply chains.
Clean Maritime Plan: UK policy document outlining roles for low-carbon fuels including offshore-produced hydrogen and ammonia.
Closed-cycle OTEC: Ocean thermal energy conversion configuration using a working fluid such as ammonia in a Rankine cycle driven by warm surface and cold deep seawater.
CO2 injection well: Subsea or platform-based well used to inject dense-phase CO2 into deep saline aquifers or depleted hydrocarbon reservoirs.
CO2 shuttle tanker: Operational term for the CO2 carriers serving Northern Lights and similar offshore storage hubs.
CO2 specification: Composition limits on impurities such as water and sulfur in CO2 streams accepted by offshore storage operators.
Cold water pipe: Large-diameter pipe used by OTEC plants to draw deep cold seawater to the surface heat exchangers.
Containment risk (CCS): Risk that injected CO2 migrates out of the intended storage complex, a central regulator concern for offshore projects.
Contour plot (wave resource): Visualization of significant wave height and period statistics used in WEC siting studies.
CorPower Ocean: Swedish wave energy developer whose C4 point absorber has been tested off Aguçadoura, Portugal.
Cosalt towage: Generic class of small-vessel towing operations used for installing and recovering tidal and wave devices in coastal sites.
Cuxhaven: German pilot station at the mouth of the River Elbe where Elbe pilots board for the Hamburg passage.

D

Darrieus turbine: Vertical-axis hydrokinetic turbine geometry that has been explored for tidal stream applications including by HydroQuest.
Deep saline aquifer: Porous and permeable rock formation containing saltwater, the primary storage medium for projects like Northern Lights and Endurance.
Demonstration array: Small group of marine energy devices deployed to validate operations and maintenance before full commercial buildout.
Densified CO2: CO2 transported as a dense liquid at elevated pressure, the form used in dedicated CO2 carriers and most subsea pipelines.
Department for Energy Security and Net Zero: UK government department responsible for the CCS cluster sequencing and the Contracts for Difference scheme that supports tidal stream.
Depleted gas field: Former hydrocarbon reservoir reused for CO2 storage, as in the Porthos and Aramis projects in the Dutch North Sea.
Deutsche WindGuard: German consultancy that publishes statistics on offshore wind and increasingly on marine energy adjacent metrics.
Diffuser augmented tidal turbine: Ducted tidal stream turbine in which a shroud accelerates flow through the rotor, used in some early concepts.
DNV: Det Norske Veritas (DNV); IACS member classification society.
Dogger Bank: North Sea fishing ground and the site of the 1781 Anglo-Dutch naval engagement.
Doosan Babcock: UK engineering company involved in CCS capture and offshore renewable engineering studies.
Dragon (Minesto): Trade name for Minesto subsea tidal kite devices deployed off the Faroe Islands and tested off Wales.
Drax Bioenergy CCS: UK BECCS proposal that would feed CO2 into the East Coast Cluster Endurance store.
Dual fuel CO2 carrier: CO2 transport vessel capable of operating on conventional and alternative fuels such as LNG or methanol.
Ducted turbine: General class of marine current device with a shroud around the rotor, used historically by OpenHydro.
Dynamic Cable: Submarine cable used on floating offshore structures designed to withstand cyclic loading from wave and current motion.
Dynamic Positioning: Computer-controlled thruster station keeping for salvage and dive vessels.

E

East Coast Cluster: UK industrial cluster on Teesside and Humberside connecting emitters to the offshore Endurance CO2 store.
Ebb generation: Tidal range generation mode that produces power as impounded water flows out of a basin through low-head turbines.
EBN: Energie Beheer Nederland, the Dutch state participation company that is a partner in Porthos and Aramis offshore CCS.
Eco Wave Power: Wave energy developer with onshore-mounted devices that capture energy from nearshore waves at breakwaters and jetties.
ECOLOG: Maritime services company developing CO2 transport solutions including CO2 carriers and floating storage units.
Eemshaven: Dutch port serving as offshore wind marshaling base for German and Dutch North Sea projects.
Electrolysis at sea: Production of hydrogen by electrolysis of seawater or desalinated seawater on offshore platforms, as in the PosHYdon pilot.
Element Power: Renewable developer historically active in marine renewable site assessment, especially in Ireland.
EMEC: European Marine Energy Centre, the wave and tidal test center in Orkney, Scotland, established in 2003.
Endurance Project: Saline aquifer storage site in the UK southern North Sea targeted by the East Coast Cluster for CO2 sequestration.
Energy yield assessment: Estimation of expected annual generation from a tidal or wave site based on resource and device performance curves.
Engie Lab Crigen: French research center that has supported offshore hydrogen and floating solar studies.
Environmental impact assessment: EIA, statutory assessment for port works.
EPCI contract: Engineering, procurement, construction, and installation contract structure used for offshore renewable and CCS projects.
Equinor: Norwegian operator and partner in the Northern Lights CO2 storage project.
Esbjerg: Danish North Sea port acting as a primary marshaling base for European offshore wind installation.
ETIP Ocean: European Technology and Innovation Platform for Ocean Energy that publishes strategic research agendas for tidal, wave, OTEC, and salinity gradient.
EU Innovation Fund: European Commission funding instrument that has supported large-scale CCS and hydrogen projects including Aramis and AquaVentus.
EUROCEAN: European network of marine research institutions cited in ocean renewable infrastructure roadmaps.
European Marine Board: Pan-European foundation that publishes position papers on ocean energy and marine spatial planning.
Europipe: Subsea gas pipeline system whose corridors are referenced in studies of CO2 and hydrogen export from continental Europe.
Ex situ leak testing: Pre-installation testing of subsea CO2 injection components performed in dockside or onshore facilities.

F

Falmouth Bay: Test area off Cornwall historically used by Wave Hub-connected wave energy converters.
Faroe Islands tidal energy: Tidal stream activity in Faroese waters featuring Minesto Dragon kite devices and SEV grid integration.
FERC: Federal Energy Regulatory Commission, US authority for LNG terminal licensing.
Field of view (sonar): Sensor parameter relevant for monitoring marine mammals at tidal and wave installations.
Fitness for purpose (CO2 well): Assessment of legacy hydrocarbon wells for reuse as CO2 injectors in offshore CCS hubs.
Floatgen: Floating renewable demonstrator off Le Croisic, France, focused on wind but referenced in adjacent ocean energy literature.
Floating offshore hydrogen production: Concept of producing hydrogen on a floating platform powered by offshore wind, current, or wave energy.
Floating photovoltaic (offshore): Solar PV installation on water at sea, distinct from inland reservoir floating solar, pioneered by SolarDuck and Oceans of Energy.
Floating solar pilot (North Sea): Demonstration installations including the Oceans of Energy array off Scheveningen, Netherlands.
Floating tidal turbine: Tidal stream device suspended from a moored floating platform, exemplified by Orbital Marine Power O2.
Flow battery (marine integration): Long-duration storage technology sometimes paired with tidal and floating solar islands.
Flow duration curve (tidal): Distribution of current speed at a tidal site used to size devices and estimate energy capture.
FORCE: Fundy Ocean Research Center for Energy, the Canadian tidal test site at Minas Passage, Bay of Fundy.
Fortum: Finnish utility involved in CCS partnerships and earlier wave energy projects with Wello.
Fos-sur-Mer: Mediterranean French port studied for CCS export and ammonia import.
FoundOcean: UK company providing subsea grouting services used in tidal, wave, and CCS structures.
Free stream tidal device: Marine current converter that extracts energy from the natural tidal flow without a barrage or impoundment.
Front end engineering design: FEED study phase used for major offshore CCS and hydrogen projects before final investment decision.
Fugro: Dutch geo-data company providing site characterization, survey, and consultancy for subsea cables, pipelines, and offshore wind foundations.

G

Gas Council pipeline (legacy): Historic offshore pipeline infrastructure in UK waters considered for reuse in CO2 and hydrogen transport.
Geological storage complex: Combined storage reservoir, primary seal, and surrounding rock used to retain injected CO2 offshore.
Geotechnical campaign: Seabed sampling and in situ testing program required for foundation design of marine renewable and CCS facilities.
Geothermal gradient (subsea): Vertical temperature change in the seabed, relevant for OTEC heat exchanger design and CCS reservoir behavior.
Glasgow Climate Pact: 2021 UNFCCC outcome that reinforced policy momentum for offshore CCS and clean hydrogen.
Goldeneye field: Depleted Shell-operated gas field in the UK North Sea originally proposed as a CO2 storage site by the Acorn Project.
Gorlov helical turbine: Helical Darrieus-type tidal stream turbine geometry tested in several research programs.
Grand Maris: Reference label sometimes used in tidal range studies of the Bay of Mont Saint Michel.
Great Yarmouth: UK port on the Norfolk coast supporting offshore wind, tidal, and CCS-related logistics in the southern North Sea.
Green Ammonia: Ammonia produced from renewable hydrogen via the Haber-Bosch process.
Green Hydrogen: Hydrogen produced via electrolysis using renewable electricity.
Greensand: Danish offshore CCS project led by INEOS and Wintershall Dea injecting CO2 into the depleted Nini West field in the Danish North Sea.
Grid code compliance (marine): Conformance of tidal, wave, and offshore solar plants with national grid connection requirements.
Grimsby: UK port on the Humber estuary that serves as one of the largest offshore wind operations and maintenance bases in Europe.
Gross head (tidal range): Vertical difference in water level between basin and sea that drives barrage or lagoon turbine output.

H

H2Mare: German flagship research project on offshore green hydrogen production funded by the Federal Ministry of Education and Research.
Habitats Directive: EU directive establishing Natura 2000 network.
Hammerfest Strøm: Original Norwegian tidal stream developer that became Andritz Hydro Hammerfest.
HAVKRAFT: Norwegian wave energy developer that has tested oscillating water column designs at small scale.
Head (low head turbine): Operating pressure difference for which tidal range turbines and some run-of-river designs are optimized.
Helgoland: German North Sea island used as a logistics base for offshore wind and the AquaVentus hydrogen initiative.
HEMU: Hammerfest energy monitoring unit, generic instrumentation reference used in early tidal stream trials.
Heriot Watt University: Scottish university with active research programs in marine energy, subsea engineering, and CCS.
Heysham nuclear site: Coastal site referenced in tidal range studies of Morecambe Bay and the Mersey.
HOPE project: European-funded study on hybrid ocean and platform energy concepts.
Horns Rev export corridor: Cable corridor in the Danish North Sea referenced in studies of integrated offshore hydrogen and CCS infrastructure.
Hub height equivalent (tidal): Reference depth of the rotor center used to characterize current shear at a tidal site.
Hull (port): UK port and home of the Siemens Gamesa blade factory that supports offshore wind and adjacent marine energy activities.
Humber Industrial Cluster: UK regional grouping that anchors the East Coast Cluster CCS pipeline to the Endurance store.
HVAC export (marine): High-voltage alternating current export system used by most existing offshore renewable installations.
HVDC interconnector: High-voltage direct current cable system that links offshore generation, including ocean energy, with onshore grids.
Hydrogen export pipeline: Subsea pipeline carrying gaseous or liquid hydrogen from offshore production platforms to shore.
HydroQuest: French tidal stream developer of vertical-axis turbines including the OceanQuest demonstrator in the Raz Blanchard.
HyNet North West: UK industrial cluster centered on the Liverpool Bay region with CO2 storage in depleted gas fields.

I

Iberdrola: Spanish utility, parent of ScottishPower Renewables and developer of Wikinger, Saint Brieuc, and Vineyard Wind 1 (with Avangrid).
IEA OES: International Energy Agency Ocean Energy Systems Technology Collaboration Programme.
IFP Energies nouvelles: French research institute active in CCS, hydrogen, and ocean energy systems analysis.
IFREMER: French Research Institute for Exploitation of the Sea that supports tidal and wave testing and OTEC studies.
Impoundment basin: Enclosed area behind a tidal barrage or lagoon used to create the head difference for generation.
In situ resource (tidal): Energy flux through a given cross section of a tidal channel, distinct from technically recoverable resource.
Induced seismicity (CCS): Possibility of small earthquakes triggered by fluid injection, monitored at offshore storage sites.
INEOS Energy: Operator that leads the Greensand CCS project in the Danish North Sea and is active in UK CCS clusters.
Inter array spacing: Distance between tidal turbines or wave devices selected to manage wake interactions.
International Maritime Organization: IMO, UN specialized agency for shipping, based in London.
Inundation flooding (tidal range): Concern about altered hydrodynamics in estuaries hosting tidal barrages or lagoons.
Invasive species (marine renewable): Ecological risk associated with biofouling and shipping at marine renewable construction sites.
IODP: International Ocean Discovery Program for scientific ocean drilling.
ISO 27914: International standard for geological storage of carbon dioxide that informs offshore CCS project design.

J

JackUp barge: Self-elevating vessel used to install tidal turbine foundations, wave device piles, and CCS subsea structures.
JADE 1: Pilot tidal stream project name used in early Verdant Power Roosevelt Island documentation.
James Watt Dock: Glasgow site historically associated with Pelamis Wave Power testing logistics.
Japan Marine United: Shipyard active in offshore wind support vessel construction for the Japanese market.
Jasmine field: UK North Sea hydrocarbon field referenced in basin-wide CCS storage capacity studies.
JERA: Japanese power generation joint venture between TEPCO and Chubu Electric, one of the largest LNG buyers in the world.
Joint Industry Project: Cooperative funding of salvage technology research and trials.
JONSWAP spectrum: Joint North Sea Wave Project spectral form.

K

Kalmar terminal: Swedish CO2 import terminal concept linked to Northern Lights shuttle tanker logistics.
Kannur tidal study: Reference to Indian tidal energy resource assessments along the Malabar coast.
Karratha (offshore): Western Australian region referenced in studies of offshore green hydrogen exports.
Kavaratti OTEC plant: Indian OTEC desalination plant on Kavaratti island in Lakshadweep operated under the National Institute of Ocean Technology program.
Kawasaki Heavy Industries: Japanese shipbuilder with a history of constructing Moss-type LNG carriers.
Kelvin probe (marine corrosion): Surface potential measurement technique used in studies of marine renewable component corrosion.
Key route (marine spatial): Designated shipping lane that constrains placement of tidal arrays, wave farms, floating solar, and CCS infrastructure.
Kinetic energy flux (tidal): Power per unit area available in a tidal current, proportional to the cube of velocity.
Kinneil terminal: Onshore facility in Grangemouth referenced in the Acorn CCS project supply chain.
Kintyre tidal: Generic reference to tidal stream resource studies in the waters around the Kintyre peninsula, Scotland.
Kobold turbine: Italian vertical-axis tidal stream turbine concept tested in the Strait of Messina.
Konkan coast wave resource: Indian wave resource zone along the Konkan coast referenced in early WEC studies by NIOT.
Korean Tidal Power Plant Association: National grouping that has documented operations of the Sihwa Lake tidal range plant.
Krill exclusion device: Conceptual screen design for marine intake structures, including OTEC cold water pipes.

L

La Rance Tidal Power Station: 240 MW tidal range plant on the Rance estuary in Brittany, France, commissioned in 1966 and operated by EDF.
Lacq pilot: Early French CCS pilot operated by Total at the Lacq gas field, referenced in offshore CCS technology transfer studies.
Lagoon (tidal): Impoundment that does not span an estuary, used in concepts such as the cancelled Swansea Bay Tidal Lagoon.
Laminar flow regime (tidal): Idealized smooth flow regime contrasted with the turbulent reality at most tidal stream sites.
Landfall (subsea cable): Location where an offshore cable or pipeline transitions to onshore infrastructure, regulated as part of EIA processes.
LCOE (marine): Levelized cost of energy used to compare tidal, wave, OTEC, floating solar, and offshore hydrogen against benchmarks.
Levelized cost of hydrogen: LCOH metric used to compare offshore green hydrogen with onshore alternatives.
Lewis wave power site: Outer Hebrides wave resource area historically targeted by multiple WEC developers.
Lhyfe: French green hydrogen developer that operates an offshore hydrogen production pilot off Le Croisic, France.
LIDAR (marine): Light detection and ranging instrument used for wind and resource measurement at offshore renewable sites.
Liquid CO2: State in which CO2 is typically transported by ship at low temperature and moderate pressure for offshore storage.
Liquid organic hydrogen carrier: LOHC, a chemical carrier proposed for offshore hydrogen export from sites such as AquaVentus.
Live monitoring (marine mammal): Use of passive acoustic monitoring and sonar to manage interactions at tidal sites such as MeyGen.
Load factor (tidal): Ratio of average to rated output for a tidal device, generally higher than wave but lower than baseload thermal.
Lock chamber (tidal range): Navigation facility at tidal barrages such as La Rance that allows ship transit through the impoundment.
Lowestoft: UK port serving operations and maintenance bases for southern North Sea offshore wind farms.

M

Magallanes Renovables: Spanish tidal stream developer of the ATIR floating tidal turbine deployed at EMEC in Orkney.
Makai Ocean Engineering: US engineering firm based in Hawaii that operates an OTEC demonstration plant at the Natural Energy Laboratory of Hawaii.
Marine Energy Council: UK industry association representing tidal stream and wave developers in policy engagement.
Marine Spatial Planning: Coordinated planning of marine area use.
MaRINET2: European Union funded program providing access to ocean energy test infrastructures across member states.
Maritime Industries Forum: European policy grouping that has addressed CO2 carriers and offshore hydrogen shipping.
MARNET: French marine renewable energy research network supporting tidal and wave demonstrations.
Mass flow controller (CCS): Instrument used to regulate CO2 injection rates into offshore storage wells.
Mediterranean OTEC: Conceptual OTEC siting studies in eastern Mediterranean and adjacent tropical seas.
Mersey Tidal Power: UK study led by the Liverpool City Region for a tidal range scheme in the Mersey estuary.
MeyGen: Tidal stream array in the Inner Sound of the Pentland Firth, Scotland, originally led by Atlantis Resources and now operated by SAE Renewables.
Microgrid (island): Local power system on small islands sometimes powered by tidal, wave, OTEC, or hybrid offshore renewable plants.
Minas Passage: Tidal channel in the Bay of Fundy hosting the FORCE tidal energy test center.
Minesto: Swedish tidal energy company developing the Dragon underwater kite, with installations in the Faroe Islands.
Mitsubishi Shipbuilding: Japanese shipbuilder that has delivered dedicated CO2 carriers for Northern Lights operations.
MMV plan: Measurement, monitoring, and verification plan required for offshore CO2 storage sites under regulatory frameworks.
Mocean Energy: Scottish wave energy developer of the Blue X hinged raft device tested at EMEC.
Mooring system (marine renewable): Anchoring arrangement used for floating tidal, wave, and solar platforms, including catenary and taut leg designs.
Morecambe Bay: UK tidal range study area referenced in 20th and 21st century barrage proposals.
Mostyn: Welsh port on the Dee estuary that serves the offshore wind and adjacent marine renewable industries.
mWave: Membrane-based wave energy converter developed by Bombora Wave Power.

N

NABU: German conservation association that has commented extensively on offshore renewable and CCS environmental impacts.
NaiKun tidal site: Reference name used in early Canadian Pacific coast tidal stream resource studies.
National Grid ESO: UK electricity system operator that handles grid integration of tidal, wave, and offshore hydrogen interconnections.
Naval Energies: French marine renewable company that owned OpenHydro until its 2018 closure.
Naval Group: French naval prime contractor, formerly DCNS.
NEDO: Japan's New Energy and Industrial Technology Development Organization that funds OTEC, wave, and offshore hydrogen R&D.
NELHA: Natural Energy Laboratory of Hawaii Authority, the state agency that hosts OTEC and related ocean technology research.
Net zero industry act: European Union regulation that includes strategic technologies relevant to ocean energy and CCS.
NewWaves: Generic placeholder for European wave energy consortium reporting and roadmap activity.
Nini West field: Depleted Danish North Sea oil field used as the CO2 store for the Greensand project.
NIOT: National Institute of Ocean Technology, Chennai, India, which has operated OTEC desalination and wave energy demonstrators.
No build zone: Designated area in marine spatial plans where renewable, CCS, or hydrogen infrastructure cannot be sited.
Norshipping: Biennial maritime industry conference in Oslo where CO2 carriers, offshore hydrogen, and ocean energy supply chains are showcased.
North Sea Transition Authority: UK regulator that issues CO2 storage and exploration licenses on the UK continental shelf.
Northern Lights: Norwegian CO2 transport and storage joint venture by Equinor, Shell, and TotalEnergies; first phase operational 2024.
Northern Pacer: One of the first dedicated liquefied CO2 carriers built by Mitsubishi Shipbuilding for Northern Lights.
Northern Pioneer: Companion vessel to Northern Pacer, also serving Northern Lights CO2 transport from European emitters to the Naturgassparken receiving terminal.