ocean energy

index

• Introduction to tidal energy
• Harnessing Tidal Energy
• Advantages and disadvantages
• Ocean Thermal Energy
• Questions

introduction

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• The ocean is a huge source of energy.
• It stores a large amount of methane gas.
• The Ocean water rises and falls periodically. This produces energy that can be harnessed easily.
• Oceans also have thermal energy stored in them that can also be harnessed.

Harnessing

usual method

• The water in the ocean rises and falls periodically two times a day, this rise and fall of water is called as a tide.
• The ocean water is collected in a dam.
• The gates are then closed.
• The water is then allowed to fall on turbines which rotate the generator shaft to produce elecrticity.

Marine current method

• In this method of harnessing tidal power, the tidal turbines are mounted on the sea bed
• The turbines move in the free flow
• This cuts the cost of building large dams

advantages

advantages

• Tidal power is amply available
• It is ecological and predictable
• It is an inexhaustable fuel.
• It is cheap
• As 71% of Earth’s surface is covered by water, there is scope to generate this energy on large scale.

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• The minimum height for the tidesshouldbe 7m
• Usually the places where tidal energy is produced are far away from the places where it is consumed. This transmission is expensive and difficult.

disadvantages

• Intensity of the waves is unpredictable
• Influences aquatic life adversely and can disrupt migration of fish.
• The actual generation is for a short period of time. The tides only happen twice a day so electricity can be produced only for that time.

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