A Blue Barrier combines the technology of a storm surge barrier with that of a tidal array. Energy-wise, the civil structure of a Blue Barrier channels the water to the turbines and ensures the full use of the available tidal flows. Alongside conventional, river-based hydropower and free-stream offshore tidal energy, the Blue Barrier is a third type of hydrokinetic energy system.

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River energy is the oldest and most prevalent renewable energy and takes the form of river dams and traditional and modern watermills. But these conventional systems have a negative ecological impact: the ‘fish friendliness’ of the turbines does not meet present-day requirements, while the environmental impact caused by reservoirs upstream and dry areas downstream is also now considered too high.

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Photovoltaic or PV solar energy is being increasingly rolled out at scale, with the number of projects in the Netherlands growing almost daily. They range from small, household-level projects to larger ones involving some form of co-operative model, and the current Dutch tax regime ensures PV technology can already be made profitable.

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