This document summarizes a presentation about tidal power. It discusses the different types of tidal power plants including tidal stream generators, tidal barrages, and tidal lagoons. Tidal stream generators use turbines placed in tidal streams, tidal barrages are dams constructed across estuaries with turbines installed, and tidal lagoons utilize artificial basins. Locations suitable for tidal power plants include areas with a large tidal range like narrow bay openings. Tidal power has advantages like predictability but also disadvantages like disrupting ocean creatures and altering ecosystems. While tidal power is proven, more research is still needed to maximize its potential as a renewable energy source.

1. Presentation by:
Sundus Afreen(18BEE073)
Abhishek Shukla(18BEE058)
University: Jamia Millia Islamia
TidalPower

2. Overview
• Introduction
• Types of Tidal Power Plants
• Geographical location
• Advantages & Disadvantages
• Conclusion

3. Introduction
What are Tides?
Tides are very long-period waves that move through the
response to the forces exerted by the moon and sun. Tides
rise and fall of sea levels.

4. Types of Tides
Types of Tides
According to
height of the
tide
High Tide Low Tide
According to
Lunar Phase
Spring Tide Neap Tide

5. High & Low Tides
High Tides
When the sea water reaches its greatest height within the tide
cycle.
Low Tides
When the sea water reaches its lowest height within the tide
cycle.

6. Spring and Neap
Tides
Spring Tides:
A spring tide is an exceptionally
strong tide, with major water
level changes between high and
low tides.
Neap Tides:
A neap tide is a weak tide, with
little difference between high and
low tides over a period of time.

7. Tidal Plants
Tidal Stream Barrage Tidal Lagoon

8. Tidal Stream Generator
 Large turbines are placed underwater, in the tidal streams. Much like wind turbines.
 Tidal currents rotates the turbines that supplies electricity according to the generation pattern following the tides.
 Rotors and blades are designed to generate power in bi-directional tidal currents.
 Electric cables are attached from the turbines that are connected via underground or surface to the power grid.
 Tidal stream generators are the cheapest and the least ecologically damaging among the all form of tidal
power generation.

9. Tidal Barrages
 Barrages(Dams) are constructed across bays,
gulfs and estuaries.
 Construction elements :
1) Caisson
2) Turbines
3) Sluices
 Sluice gates are opened that allows the flow
according to the ebb and flood tide
 Turbines are installed in the barrage wall that
generate power as water flows in and out of the
estuary basin, bay, or river.
 A barrage is more expensive to construct, and
requires constant supervision.
 Similar to Dams but bidirectional.

10.  A tidal lagoon is a body of ocean water that is
partly enclosed by a natural or manmade barrier.
 Tidal lagoons might also be estuaries and
have freshwater emptying into them.
 Utilizes the same generation technology as the
barrage.
Tidal Lagoon
 It can also be constructed along open coastlines.
 A tidal lagoon power plant could also generate
continuous power.
 Has other benefits as Maricultural farming, sport etc.

11. Geographically favourable locations for Tidal Power Plants
Barrage Types
 Narrow bay opening, gulfs,
estuaries etc.
 Sihwa Lake Plant
 Gulf of Kutch, Gulf of Khambhat.
Stream Turbine Type
 Close to shore, shallow water,
with reliable tidal currents.
 Land constrictions such as straits
or inlets
 SeaGen
Lagoon Type
 Artificial basin , open ocean
 Location to utilise its other
benefits.
 Swansea Bay
o Identification of good sites having appreciable tidal range.
o Preferably not close to a marine habitat.

12. Advantages & Disadvantages
Advantages
1. Much Superior to Hydro-power plant as it
is totally independent of rain which always
fluctuates year to year.
2. Free from pollution and won’t produce any
unhealthy waste like ash, gases, etc.
3. Employs existing technologies used for
power generation as that of wind turbines
etc.
4. Tidal patterns are utterly predictable.
5. The life of tidal power plant is very long.
6. More efficient than wind because of the
high density of water.
Disadvantages
1. Water is not replenished, it cannot flow
away, so any dirt or pollution lingers near
the coast.
2. The plant disrupts creatures migration in
the ocean.
3. Produces power for 10 hours a day.
4. Tidal patterns don’t always match demand
pattern.
5. Alters marine ecosystem.

13. Yet, A long way to go…
Tidal Power is a proven technology and yet it is at its infancy.
It has potential to generate significant amount of electricity to support
the economy only with renewable source of energy.
Extensive research has been going on in this domain.
• Environmental impacts
• Dynamic Tidal Power Plants
• Designing efficient turbines