Tidal Stream Energy
Since tides are predictable and reliable, with tide times varying according to location, tidal energy can offer a near continuous power supply. There are two main types of tidal energy:- tidal stream and tidal range.
Tidal stream energy makes use of the kinetic energy of moving water to power turbines. Tidal streams are created by the constantly changing gravitational pull of the moon and sun on the world’s oceans. Tides never stop, with water moving first one way, then the other, the world over. Tidal stream technologies capture the kinetic energy of the currents flowing in and out of the tidal areas. Since the relative positions of the sun and moon can be predicted with complete accuracy, so can the resultant tide. It is this predictability that makes tidal energy such a valuable resource.
Tidal stream resources are generally largest in areas where a good tidal range exists, and where the speed of the currents are amplified by the funnelling effect of the local coastline and seabed, for example, in narrow straits and inlets, around headlands, and in channels between islands. Tidal Energy Limited’s Delta Stream project was the first tidal stream project to be deployed in Wales and is located off Ramsey Island, Pembrokeshire. Tidal streams around the west of Ramsey Island and within Ramsey sound can each up to 4ms-1 providing an indicative capacity of ~150 MW.
Please click here to see the six main types of Tidal Energy Converters (TEC) identified by EMEC.