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Ocean Thermal Energy Conversion (OTEC)
  by L. A. Vega, Ph.D., Hawaii, USA.

Previous: Economic Considerations and Market Potential 

12 - Hydrogen Production

Several means of energy transport and delivery from plants deployed throughout the tropical oceans have been considered.  OTEC energy could be transported via electrical, chemical, thermal and electrochemical carriers.  The technical evaluation of non-electrical carriers leads to the consideration of hydrogen produced using electricity and desalinated water generated with OTEC technology.  The product would be transported, from the OTEC plantship located at distances of 1,600 km (selected to represent the nominal distance from the tropical oceans to major industrialized centers throughout the world) to the port facility in liquid form to be primarily used as a transportation fuel.  A 100 MW-net plantship can be configured to yield (by electrolysis) 1300 kg per hour of liquid hydrogen.  Unfortunately,  the production cost of liquid hydrogen delivered to the harbor would be equivalent to a $250 barrel-of-crude-oil (approximately 10 times present cost). The situation is similar for the other energy carriers considered in the literature. Presently, the only energy carrier that is cost-effective for OTEC energy is the submarine power cable.  This situation might be different if the external costs of energy production and consumption are accounted for.

Next: Externalities

© 1999. L. A. Vega. All rights reserved.
Published here with the kind permission of the author.