Tidal Energy

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Tidal power is generated based on the forces involved in the movement of the Earth relative to the moon and the sun, to some degree. Tidal forces are created in the interaction of gravitational forces between these three bodies. Since the Earth is consistently in motion, tidal energy is tapped as a renewable source of power.

What is tidal energy?

Tidal energy is a subtype of hydraulic energy, as electricity can be generated by using the forces of tides. As mentioned, it is derived from the relative motion of the Earth to the moon and sun and the tidal forces created through gravitation. There are two main methods by which tidal energy produces electricity. First is the tidal stream system, which allows turbines to run by utilizing the kinetic energy of flowing water. Second is the use of barrages or dam-like structures, which create power from the potential energy found in the height difference of tides. Between the two methods, tidal stream systems are more preferred because they are less expensive and more eco-friendly.

What are the pros and cons of using and harnessing tidal energy?

Although tidal power is not yet commercialized, it is a more reliable source of renewable energy source due to the continuous motion of the Earth around its axis. Tidal energy is thus more stable than wind and solar energy, which remain to be the most popular alternative power sources. In addition, it is non-polluting, and its use as a power source can save as much as 18 million tons of coal per year. However, the construction of barrages is believed to have adverse effects on biodiversity aside from being costly. In terms of economic feasibility, the transition to tidal power may also take a long time before a good return on investment can be achieved.