Tidal energy is the form of hydro-power that converts the energy obtained from tides into useful forms of power, mainly electricity. Although not yet widely used, tidal energy has potential for future electricity generation. This presentation covers the basics of Tidal energy.

1. TIDAL
ENERGY
OLAOLU MATEMILOLA
M.Sc Environmental science
Cyprus International University,
Cyprus
olaolu.matem@gmail.com

2. Overview
2
 Definition
 Tidal barrages
 Tidal steam generators
 Dynamic tidal power
 Conclusion
 References

3. Definition of Tide, Tidal
movement
 The tide is the regular rising
and falling of the ocean's
surface caused by changes
in gravitational forces
external to the Earth
 Tidal current is the
alternating horizontal
movement of water
associated with the tide
 Tidal energy converts the
energy from the natural rise
and fall of the tides into
electricity.
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4. Types of tides
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5. Types of tidal energy plants
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Tidal barrages
Tidal steam generators
Dynamic tidal power

6. Tidal barrages
6
A tidal barrage
is a dam-like
structure used
to capture the
energy from
masses of
water moving
in and out of a
bay or river
due to tidal
forces

7. Tidal barrages (Cont’d)
 Tidal barrages have an
efficiency of 80 percent in
converting the potential energy of
the water into electricity.
 Sihwa Lake Tidal Power Station
is the world's largest tidal
power installation, with a total
power output capacity of 254
MW.
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8. Tidal barrages (Cont’d)
 Renewable
 No waste produced
 No air pollution
 No fuel cost
 Produces lots of
power
 Huge initial cost
 Global shortage of
viable sites
 Requires constant
supervision to
adjust power
output.
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ADVANTAGES DISADVANTAGES

9. environmental impact of a barrage
system
9
 The land in the tidal range is completely disrupted.
 The change in water level in the tidal lagoon might harm plant and
animal life.
 The salinity inside the tidal lagoon lowers, which changes the
organisms that are able to live there.
 As with dams across rivers, fish are blocked into or out of the
tidal lagoon.
 Turbines move quickly in barrages, and marine animals can be
caught in the blades.
 With their food source limited, birds might find different places
to migrate.
 Turbidity decreases as a result of smaller volume of water being
exchanged between the basin and the sea

10. Tidal steam generators
10
A tidal stream
is a fast-flowing
body of water
created by
tides
Tidal stream
generators
make use of
the kinetic
energy of the
tidal stream to
turn a turbine
to create
electricity

11. Tidal steam generators (Cont’d)
 Turbines are most
effective in shallow
water. This produces
more energy and
allows ships to
navigate around the
turbines
 It’s design is similar to
wind turbine but has
higher efficiency
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12. Tidal steam generators (Cont’d)
 They can be incorporated
into existing structures like
bridges and docks. This
not only further reduces
the cost, but also reduces
the environmental impact.
 The turbines turn relatively
slowly, hence do not affect
sea life
 Placing turbines in tidal
streams is complex,
because the machines are
large and disrupt the tide
they are trying to harness.
 Tidal stream generators
generally cannot produce
as much power as barrage
systems
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ADVANTAGES DISADVANTAGES

13. environmental impact of a Tidal
stream
13
 High speed water increases the risk of blade
strike and entanglement of marine organisms.
 As with all offshore renewable energies, there is
also a concern about how the creation of EMF
and acoustic outputs may affect marine
organisms

14. Dynamic tidal power
14
DTP is an untried but
promising technology that
would involve creating a long
dam-like structure
perpendicular to the coast,
with the option for a coast-
parallel barrier at the far end,
forming a large 'T' shape.
This long T-dam would
interfere with coast-parallel
tidal wave hydrodynamics,
creating water level
differences on opposite sides
of the barrier which drive a
series of bi-directional
turbines installed in the dam

15. Dynamic tidal power (Cont’d)
 It is estimated that some of the largest
dams could accommodate over 15 GW
(15000 MW) of installed capacity.
 A DTP dam with 8 GW installed capacity
and a capacity factor of about 30%, could
generate about 21 TWh annually.
 A dam of 40 KM in length can
accommodate 2000 turbines
 Utilizes highly advanced turbines. They are
bi-directional and have a peak output of
5MW each
 DTP doesn't require a very high natural
tidal range, but instead an open coast
where the tidal propagation is alongshore.
Such tidal conditions can be found in many
places around the world
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16. Dynamic tidal power (Cont’d)
 Multiple Functions
 Stable, sustainable,
and available
 No areas are
enclosed
 High power output.
 Lack of proof
 High costs
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ADVANTAGES DISADVANTAGES

17. Conclusion
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 Tidal barrage systems are likely to be less
utilized due to cost and environmental impact.
 Systems like dynamic tidal power, tidal stream
generation, and other new technologies will
probably be utilized as energy needs increase
and fossil fuel use becomes less desirable

18. References
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 https://www.knowswhy.com/benefits-of-tidal-
power/
 https://www.nationalgeographic.org/encyclopedia/t
idal-energy/
 Rourke, F. O., Boyle, F., & Reynolds, A. (2010).
Tidal energy update 2009. Applied Energy, 87(2),
398-409.
 Gorlov, A. M. (2001). Tidal energy. Elements of