Ocean thermal energy conversion (OTEC) is a renewable energy technology that uses the temperature difference between warm surface ocean waters and cold deep ocean waters to produce electricity. OTEC systems take advantage of the sun's heating of surface waters and the ocean's ability to store heat in its deep waters to drive a power generating cycle. As long as there is a temperature difference of around 20°C between surface and deep waters, an OTEC system can produce a significant amount of electricity with little environmental impact. The oceans receive vast amounts of solar energy and represent an enormous untapped renewable resource that could help meet the world's growing energy needs.

3.  Ocean covers >70% Earth’s surface.
 Largest natural solar collector and storage system.
 Largest renewable energy resource.
 Ocean water stores much more heat than the
atmosphere.
 Ocean contains enough energy power all of the world’s
electrical needs.
 Renewable – The world’s use of energy is ever-
increasing. At the same time, traditional sources of
energy are depleting. OTEC is an economically-viable
energy option with practically zero carbon emissions.

4.  OTEC, or Ocean Thermal Energy Conversion, is an
energy technology that converts solar radiation to
electric power.
 OTEC systems use the ocean's natural thermal
gradient—the fact that the ocean's layers of water
have different temperatures to drive a power-
producing cycle.
 As long as the temperature between the warm surface
water and the cold deep water differs by about 20°C
(36°F), an OTEC system can produce a significant
amount of power, with little impact on the
surrounding environment.

5.  OTEC is an energy technology that converts solar
radiation to electric power
 Temperature difference between the warm surface
water and the cold deep water below 600 meters by
about 20° C, an OTEC system can produce a
significant amount of power.
 oceans are thus a vast renewable resource, with the
potential to help us produce billions of watts of
electric power

6.  Idea thought of by Jacques D’Arsonval, in
1881.
 French physician that contributed greatly to
electrophysiology.
 His student, Georges Claude, created the first
OTEC system in Cuba in 1930.

7.  Hot surface water, boils low boiling point
liquid
 Boiling liquid turns turbine which generates
electricity
 Electricity carried to land through underwater
cable
 Deep cold water used to cool and condense
liquid

9.  Land based power plants
 Floating power plants
 Land or floating power plants

13.  Closed-cycle OTEC
 Open-cycle OTEC
 Hybrid cycle OTEC

17.  Sagar Shakthi - the Ocean Thermal Energy
Conversion (OTEC) Barge - a power plant, is the
first of its kind in the world to generate electricity
utilizing the temperature gradients between
surface and deep-sea water.
 The barge is 68.5 m long, 16 m broad and 4 m
deep, The barge has been jointly conceived and
developed by the National Institute of Ocean
Technology, Chennai, and Dempo Shipbuilding
and Engineering Pvt. Ltd, Goa.

18.  The barge produces 1MW of electricity.
 The project was built by Dempo Shipbuilding
and Engineering at its shipyard at Bainguinim,
Goa. The OTEC barge is presently anchored
40 nautical miles off the coast of Tuticorin
Port.

21.  Types of Concrete Structures
1) Bottom-Founded Structures
2) floating structures
3) other structures
Bottom-founded structures can be further identified
as:
 1) Gravity-base structures
 2) Concrete cylinder pile-supported structures
 3) Floatable/bottom-founded concrete-hull
structures

25. NEW SCHEMES PROPOSED DURING XI FIVE YEAR
PLAN In crores
SL
No.
Scheme 2007-
08
2008-
09
2009-
10
2010-11 2011-
2012
Total
Budget
Provision
in XI plan
1 Desalination
Project
7.00 140.00 43.00 8.00 6.65 204.65

26. Scheme 2007-08 2008-09 2009-
10
2010-
11
2011-
12
Total
OCEAN
DEVELOPME
NT
Continuing 790.615 1021.855 1031.53 938.61 995.08 4777.69
New 180.70 531.05 495.88 175.52 111.00 1494.15
Total (Ocean
Development)
971.315 1552.905 1527.41 1114.13 1106.08 6271.84

27.  Desalination
 Mineral water production
 Lithium extraction
 Air conditioning
 Aquaculture
 Food, cosmetics, medical science etc
 Hydrogen production

32.  OTEC uses clean, renewable, natural resources. Warm surface
seawater and cold water from the ocean depths replace fossil fuels to
produce electricity.
 Suitably designed OTEC plants will produce little or no carbon
dioxide or other polluting chemicals.
 OTEC systems can produce fresh water as well as electricity. This is a
significant advantage in island areas where fresh water is limited.
 There is enough solar energy received and stored in the warm tropical
ocean surface layer to provide most, if not all, of present human energy
needs.
 The use of OTEC as a source of electricity will help reduce the state's
almost complete dependence on imported fossil fuels.

33.  OTEC-produced electricity at present would cost more than electricity
generated from fossil fuels at their current costs.
 OTEC plants must be located where a difference of about 20º C occurs
year round.
 Ocean depths must be available fairly close to shore-based facilities for
economic operation. Floating plant ships could provide more flexibility.
 No energy company will put money in this project because it only had
been tested in a very small scale
 Construction of OTEC plants and lying of pipes in coastal waters may
cause localized damage to reefs and near-shore marine ecosystems

34.  OTEC has tremendous potential to supply the
world’s energy.
 OTEC offers one of the most compassionate
power production technologies.
 As long as the sun heats the waters of the oceans,
the potential for power conversion though OTEC
will always exists.
 The oceans are thus a vast renewable resource,
with the potential to help us produce billions of
watts of electric power.

35.  The distinctive feature of OTEC energy
systems is that the end products include not
only energy in the form of electricity, but
several other synergistic products.

36.  Concrete for offshore structures chapter 13 George
C. Hoff, D.Eng., P.E.
 Eleventh plan 2007-2012 working group document
volume 2 (Ocean development) page no 4, 23, 33.
 Göran Wall, Alternativa energisystem, 1998,
http://www.exergy.se/ftp/aes.pdf
 http://www.seasolarpower.com
 lectures/resources/lect838737281.html