Offshore Energy Storage - Market Share Analysis, Industry Trends & Statistics, Growth Forecasts (2026-2031)

The offshore energy storage market size is expected to grow from USD 411.45 million in 2025 to USD 454.24 million in 2026 and is forecast to reach USD 743.34 million by 2031 at 10.35% CAGR over 2026-2031. This report is segmented by Technology (BESS, Mechanical, Hydrogen, Thermal, Other), End User (Offshore Wind Farm Operators, Oil & Gas Operators, Vessel Owners and Operators, Utilities and IPPs, Remote Islands and Microgrids), and Geography (North America, Europe, Asia-Pacific, South America, Middle East and Africa). Forecasts are in Value (USD).

Global Offshore Energy Storage Market Trends and Insights

Offshore Wind Curtailment and Grid-Connection Congestion

The Offshore energy storage market is gaining urgency as wind generation is curtailed when transmission networks cannot carry available output. Xodus Group projected that annual European curtailment could exceed 300 TWh by 2040 as offshore wind capacity expands toward the European Union target. The same analysis reported EUR 8.9 billion in congestion-management costs during 2024. Storage located alongside wind assets can absorb output during constrained periods and support more controlled dispatch. A 2025 IEE conference study found that co-located BESS using ensemble-based stochastic dispatch reduced curtailment by up to 15% against deterministic dispatch approaches. The study also found that improved dispatch raised market revenue by 0.1% to 5%, depending on intraday price volatility. These conditions favor projects that can enter service before transmission reinforcement reduces the value of curtailment management.

Co-Location of Storage With Offshore Wind Transmission Assets

The Offshore energy storage market is also supported by designs that share grid connections and transmission assets with offshore wind projects. Ørsted began construction of the 300 MW, 600 MWh Iceni BESS in March 2025 beside the Hornsea 3 onshore substation in Norfolk. The project shares infrastructure associated with the offshore wind development instead of requiring a separate connection. This arrangement can reduce duplicated infrastructure and give a single project access to curtailment management, ancillary services, and capacity payments. Northland Power stated that it is developing 300 MW, 1.2 GWh of co-located BESS with Poland’s Baltic Power offshore wind project. Baltic Power delivered its first offshore wind electricity to Poland’s grid in 2026. Shared infrastructure gives lenders an operational reference for assessing integrated project structures.

High Marine Installation and Maintenance Costs

The Offshore energy storage market faces higher installation and maintenance costs than comparable land-based projects. Offshore systems require marine-certified equipment, specialized vessels, qualified crews, and work completed within limited weather windows. FLASC stated that marinized offshore lithium-ion systems can exceed EUR 1,100 per kWh for short-duration use. Its comparison placed comparable onshore systems near EUR 500 per kWh. These costs favor assets that can earn revenue from several services, including congestion management, balancing services, and capacity mechanisms. FLASC also indicated that hydro-pneumatic systems may have a cost advantage at storage durations of 16 to 24 hours, although commercial-scale validation remains necessary.

Other drivers and restraints analyzed in the detailed report include:

• Maritime Decarbonization and Zero-Emission Vessel Adoption
• Offshore Platform Electrification and Hybrid-Power Demand
• Fragmented Permitting and Revenue-Stack Uncertainty

Segment Analysis

Battery Energy Storage Systems held 53.2% of the Offshore energy storage market share in 2025. BESS has established operating experience, recognized safety pathways, and familiar procurement structures. The technology is particularly suited to short-duration balancing, curtailment management, and vessel electrification. Ørsted’s 300 MW, 600 MWh Iceni project demonstrates how BESS can be connected to offshore wind-related transmission infrastructure. Its design gives the project a direct operating reference for future integrated developments. Offshore deployment still requires humidity control, corrosion protection, safety systems, and equipment that can tolerate vibration. These requirements raise costs against standard land-based units. The Offshore energy storage industry, therefore, depends on suppliers that combine battery expertise with marine engineering and digital dispatch capabilities.

Hydrogen energy storage is forecast to grow at a 15.4% CAGR through 2031. The technology can support longer storage periods than a battery system designed primarily for hourly balancing. The CrossWind Base Load Power Hub at the Hollandse Kust Noord wind farm combined a 2.5 MW PEM electrolyzer, a 1 MW fuel cell, and a 5 MWh battery buffer. The system was handed over to operator DOT in October 2025 and was renamed Phynix. FLASC is also developing hydro-pneumatic energy storage for 4 to 100 hours of duration, with a stated round-trip efficiency near 70%. Its grid-connected pilot at Plant One Rotterdam was in progress during 2025 and 2026. These technologies broaden the Offshore energy storage market beyond battery-led applications.

Complete Report Scope:

• By Technology
  • Battery Energy Storage Systems (BESS)
  • Mechanical Energy Storage
  • Hydrogen Energy Storage
  • Thermal Energy Storage
  • Other Emerging Storage Technologies
• By End User
  • Offshore Wind Farm Operators
  • Oil and Gas Operators
  • Vessel Owners and Operators
  • Utilities and Independent Power Producers
  • Remote Islands and Microgrids
• By Geography
  • North America
    • United States
    • Canada
    • Mexico
  • Europe
    • Germany
    • France
    • Italy
    • Spain
    • United Kingdom
    • Poland
    • Russia
    • Rest of Europe
  • Asia-Pacific
    • China
    • India
    • Japan
    • South Korea
    • Australia
    • Indonesia
    • Vietnam
    • Thailand
    • Rest of Asia-Pacific
  • South America
    • Brazil
    • Argentina
    • Chile
    • Rest of South America
  • Middle East and Africa
    • Saudi Arabia
    • United Arab Emirates
    • Egypt
    • South Africa
    • Morocco
    • Rest of Middle East and Africa

Geography Analysis

Europe held 56.4% of the Offshore energy storage market share in 2025. The region combines a large offshore wind fleet, significant grid congestion, and established project-development experience. The UK, Germany, Denmark, and the Netherlands remain central locations for co-located storage activity. ENTSO-E's Offshore Roadmap identified regulatory adaptation, locational price signals, and cross-border coordination as priorities for offshore development. The roadmap supports the European Union's objective of 365 GW of offshore renewable capacity by 2050. Poland is adding an important new reference through Baltic Power and its planned 300 MW, 1.2 GWh storage system.

Asia-Pacific is forecast to grow at a 16.4% CAGR through 2031. China's offshore deployment scale and national investment in transmission are important factors in the region's expansion. South Korea's Offshore Wind Promotion Act, enacted in 2024, provides a clearer route for project development. The government plans to designate 25 GW of offshore wind zones by 2031. The Shinan Uii 390 MW offshore wind complex began construction in July 2026. Its reported investment was KRW 3.4 trillion, equivalent to USD 2.5 billion. The Offshore energy storage market in the region will be affected by the pace of grid deployment, storage safety rules, and domestic supply chains.

North America represented a smaller share of the Offshore energy storage market in 2025, but vessel electrification and long-duration storage are developing important project references. ABB's selection of Corvus systems for Washington State Ferries demonstrates the scale of public ferry electrification procurement. Hydrostor stated that its Quinte Energy Storage Centre in Ontario is planned with an initial 4 GWh phase for the early 2030s. South America, the Middle East, and Africa remain early-stage areas. Their island systems offer a comparable use case where diesel exposure makes renewable generation and storage more valuable. The geographic opportunity depends on bankable procurement structures and reliable local maintenance capacity.

List of Companies Covered in this Report:

• ABB Ltd.
• Ameresco, Inc.
• Corvus Energy
• E.ON SE
• Energy Vault Holdings, Inc.
• Equinor ASA
• FLASC B.V.
• Fluence Energy, Inc.
• GE Vernova Inc.
• HDF Energy
• Highview Power
• Hitachi Energy Ltd.
• Hydrostor Inc.
• Leclanché SA
• Ørsted A/S
• RWE AG
• Schneider Electric SE
• Siemens Energy AG
• Subsea7 S.A.
• TotalEnergies SE

Additional Benefits:

• The market estimate (ME) sheet in Excel format
• 3 months of analyst support