Siemens Energy has selected EST-Floattech to supply a battery system in excess of 1 megawatt hour for Marco Polo Marine's new CSOV Plus, MarineLink Maritime News reported on 1 October 2026.
The contract covers delivery of the Octopus High Energy battery system to the vessel, which Marco Polo Marine markets as a crew transfer and service operation vessel configured to operate in both offshore wind and oil and gas sectors. The confirmed capacity exceeds one megawatt hour, underlining the scale of the energy storage installation.
The choice of EST-Floattech as supplier was announced by Siemens Energy according to the report. The assignment places a large-capacity battery at the heart of the CSOV Plus design, reflecting an increasing focus on onboard energy storage for complex offshore tasks.
The CSOV Plus is described as a multi-role vessel intended to bridge service needs across two different offshore markets. Equipping such a platform with a system of more than 1 MWh signals that shipowners and operators are planning for substantial electrical demand and for tools that reduce dependence on continuous engine running.
MarineLink's item does not supply delivery dates or further contractual particulars. The published note names the battery package and the parties involved but does not elaborate on operational modes, redundancy, or integration arrangements with the vessel's propulsion or hotel systems.
Battery scale and vessel role
A battery system above one megawatt hour is significant for a vessel in the CSOV category because it represents capacity large enough to support sizeable hotel loads, peak shaving or periods of reduced generator use. The Octopus High Energy name appears in the report as the battery solution selected for the CSOV Plus.
The presence of that scale of storage on a vessel designed to work for both wind farms and oil and gas installations suggests planners expect a mix of operating profiles. These can include frequent manoeuvring near turbines, transfer operations that require stable on-board power, and work tasks that may call for bursts of electrical supply.
Industry implications
The announcement, as reported by MarineLink Maritime News, links a major energy engineering company, Siemens Energy, with a specialist marine battery supplier and a vessel owner developing a hybrid-purpose CSOV. The interplay of expertise from different segments demonstrates how system suppliers and shipbuilders are combining to meet offshore electrification needs.
While the report does not set out performance guarantees or lifecycle expectations, the publicised sizing of the battery alone is likely to be noted by fleet managers assessing how energy storage can support operational flexibility. The transaction highlights continued commercial interest in equipping service vessels with substantial battery capacity.
MarineLink's coverage provides the core facts of the agreement and the basic specification point. Beyond that, the report leaves several technical and programme details unconfirmed in the public domain. Readers seeking contract milestones, testing regimes or integration schedules will need to await further disclosures from the companies involved.
The selection of EST-Floattech to supply the Octopus High Energy battery system for Marco Polo Marine's CSOV Plus, as announced by Siemens Energy, therefore represents a clear instance of the maritime sector's ongoing shift towards larger onboard energy storage solutions for offshore service craft.
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