Caudal Energy, a company developing a new class of predictable renewable power systems, has raised £4.3 million in funding, led by Oxford Science Enterprises (OSE) and Empirical Ventures, with participation from other investors, including existing investors Zero Carbon Capital and Creator Fund.
The funding represents one of the most significant recent institutional venture investments into tidal energy in the UK, reflecting the important role predictable renewable power will play in balancing costs and system volatility.
Caudal Energy, founded as Porpoise Power in 2024 on breakthrough hydrodynamic research originating from co-founder Professor Adrian Thomas at the University of Oxford, is rethinking how tidal energy is generated from first principles.
Inspired by the efficiency of the tail or caudal fins of marine mammals, the company’s proprietary oscillating foil system works with tidal flows rather than against them, enabling a simpler, smarter and more commercially scalable approach to marine energy generation.
Its modular design simplifies installation, reduces maintenance costs and lowers operational complexity, creating a more commercially practical pathway for tidal energy to scale as part of future renewable infrastructure and complement intermittent renewable sources with dependable baseload generation.
The Caudal Generator is designed to deliver predictable, reliable and scalable renewable power from a significantly broader range of tidal sites than traditional systems, at costs competitive with established technologies such as offshore wind. At a system level, tidal energy enhances energy security and significantly reduces grid system costs by providing a consistent source of baseload energy.
Caudal’s fin-based technology will dramatically expand where tidal energy can be deployed. While tidal energy has long been recognised for its predictability, commercial deployment has historically been constrained by the complexity and economics of turbine-based systems operating in a limited number of extreme conditions with peak flows above 5 knots.
Caudal Energy’s modular, surface-mounted architecture is designed to overcome these constraints.
By operating efficiently in abundant mid-flow tidal locations, with peak flows above 3 knots, the platform dramatically expands the viable deployment footprint for tidal energy. This unlocks a materially larger global market opportunity across utility-scale, industrial and distributed energy applications.
Already at Technology Readiness Level 5 (TRL), the investment will support the next phase of development and full-scale testing of Caudal Energy’s breakthrough fin-based tidal technology at Strangford Lough, Northern Ireland. The company’s first commercial deployment is targeted for 2028, taking it to TRL8.
According to John Kennedy, CEO of Caudal Energy, the future energy system needs renewable power that is not only clean, but dependable and built to scale.
“We founded Caudal to challenge the assumption that tidal energy has to remain complex, costly and niche. Our approach combines smarter hydrodynamic design with modular deployment architecture to create a system designed for real-world performance.
By unlocking the potential of mid-flow tidal sites, we believe Caudal can dramatically expand where tidal energy can be deployed and how commercially competitive it can become.”
Andy Straiton, Investment Lead at Oxford Science Enterprises, commented:
“Caudal Energy is addressing one of the most important challenges in the transition to renewable energy: how to provide predictable, scalable generation that complements intermittent power sources such as wind and solar.
Caudal’s approach is designed around the economics required for large-scale deployment, not just technical performance. The combination of simpler deployment, lower operational complexity and access to a far broader range of viable sites can make tidal energy cost competitive with established renewables such as solar and wind.”
Johnathan Matlock, General Partner at Empirical Ventures added:
“Grid operators are increasingly pricing predictability into the system, and the renewables that benefit are the ones that can deliver deterministic output without storage costs.
Caudal is one of the only tidal platforms we have assessed with a credible path to LCOE parity with offshore wind, and the team has done the detailed engineering work to back up the modular deployment claim at scale. This is what made it investible for us.”
The funding will be used to expand Caudal Energy’s engineering and modelling capabilities, advance demonstration and deployment activities, and accelerate commercial partnerships across utility, industrial and distributed energy markets.
Caudal Energy is currently progressing development and deployment discussions with a range of strategic partners as it moves toward commercial-scale demonstration.
Lead image: Magnific.
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