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Emerging Technologies

Tidal stream and tidal barrage power

  • 3 things to know
  • A2 1

Overview

Why wave and tidal energy matter for Northern Ireland, the predictability of tides, SeaGen in Strangford Lough, tidal stream generators, tidal barrages and the Rance station, tidal lagoons, and tidal range against tidal stream energy.

What you need to know

Answer each one before you reveal it.

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Numbers

How does a tidal barrage generate electricity, and what is the Rance tidal power station?

Key term

Why is energy from waves and tides a priority for Northern Ireland?

Key term

Why is tidal energy more predictable than wind or solar energy?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Why is energy from waves and tides a priority for Northern Ireland?

    Model answer

    Northern Ireland is surrounded by sea with strong tidal flows, such as those in Strangford Lough. Marine energy could cut the region's reliance on imported fossil fuels.

  2. 2

    Why is tidal energy more predictable than wind or solar energy?

    Model answer

    Tides are driven by the gravitational pull of the Moon and Sun, so their timing can be forecast years ahead. Wind and sunshine vary with the weather.

  3. 3

    What is a tidal stream generator?

    Model answer

    A tidal stream generator is an underwater turbine turned by fast-flowing tidal currents. The turbine drives a generator, much like a wind turbine under water.

  4. 4

    What was SeaGen?

    Model answer

    SeaGen was a tidal stream generator installed in the narrows of Strangford Lough in 2008. SeaGen was the world's first commercial-scale tidal stream turbine and was later decommissioned.

  5. 5

    How did SeaGen's design allow maintenance?

    Model answer

    SeaGen's twin rotors were mounted on a crossbeam that could be raised above the water. Engineers could reach the rotors without divers.

  6. 6

    What is a tidal barrage?

    Model answer

    A tidal barrage is a dam built across an estuary with turbines in sluices. Water held behind the barrage flows through the turbines as the tide falls.

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