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Maritime battery systems company EST-Floattech closes €4M investment

Developer of maritime battery systems EST-Floattech has received an investment of €4 million from Energy Transition Fund Rotterdam and existing shareholders Rotterdam Port Fund, PDENH, Ponooc, and Yard Energy.

EST-Floattech develops and produces lithium-ion battery systems for electric and hybrid propulsion of inland vessels, ferries, yachts, and more. Energy Transition Fund Rotterdam is investing €3 million, the fund’s first investment in maritime battery systems. The existing shareholders are jointly investing €1 million.

EST_Floattech_Octopus Series_Containerized

As fund manager of Energy Transition Fund Rotterdam and investor in Rotterdam Port Fund, InnovationQuarter is closely involved in the investment. Rotterdam Port Fund is a private investment fund focused on innovation in the port sector. The fund played an important role in the realization of the transaction, which exemplifies the close cooperation within the South Holland maritime cluster. EST-Floattech contributes to this ecosystem through their many Rotterdam customers, including Damen and KOTUG. Innovation in electrification aligns with both the Regional Maritime Agenda 2030 and the Regional Energy Strategy for Rotterdam/ The Hague.

EST-Floattech_Octopus Series battery room

Inland and maritime shipping together account for 16.5% of the Netherlands’ CO2 emissions. Goods transported by water will increase significantly in the coming years. The EU is aiming for a 50% increase in transport via inland waterways and shorter sea routes by 2050 compared to 2015. For international shipping, volume growth of more than 200% is even expected between 2023 and 2050. Currently, only 1% of the global fleet is electrified, and the sector needs to catch up tremendously to achieve net zero by 2050.

Since 1 January 2024, the European CO2 emissions trading system EU-ETS has been in place for larger ships, with smaller ships expected to follow in 2026. The increasing costs associated with CO2 emissions make electrification increasingly interesting within a rapidly growing market.



The electric Candela system of foiling above the water is massively more efficient than ploughing through it, for their present craft using about the same energy per hour once foiling at 20 knots as the vessel uses at 4 knots before getting up on the plane.

I say Candela, as they use a very sophisticated computer controlled foiling system, adjusting them 100 times per second.

What I did not know was how difficult it would be to upsize from their current largest boat, which is around 12 meters and 9.5 tons.

Just tracked it down:

' “We can scale our technology not only to bigger tenders, but also to superyachts (at least up to 50 meters long),” says Mahlberg. “So, in the future, you might see a flying, Candela electric superyacht that roams the sea at 30 knots without wake or emissions.”'

Weight is important, so maybe not so much for freight?

But for any leisure craft, it seems unmatchable.

Perhaps powered by fuel cells using either hydrogen or methanol where batteries do not give enough range.

Speaking of batteries for marine use, it is early days, but non-flammable manganese batteries may be useful in the application when energy densities are improved, with their first uses being in stationary storage:
There are a couple in final development

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