Partnership to build world's largest OTEC plant off China coast

April 24, 2013 by Bob Yirka, report

Credit: Lockheed Martin
( —Hong Kong based Reignwood Group and U.S. aerospace company Lockheed Martin have announced plans to build an Ocean Thermal Energy Conversion (OTEC) electricity generating plant off the coast of China to power a planned resort community. Lockheed Martin is to build the facility and run it, while the Reignwood Group will be building the resort community that is to use the power generated. The new plant is expected to produce 100 percent of the power needs of the community.

OTEC generate electricity by taking advantage of the difference in at different ocean depths—warm surface water is used to boil a fluid (one that has a low boiling temperature such as ) that in turn drives a turbine. Cold water brought up from below cools the liquid causing it to once again liquefy allowing the process to repeat over and over. To date, few such plants have been built due to the large expense involved in transporting cold water up from below. The new plant to be built off the coast of will be a designed to not only supply electricity to the new resort community, but also to serve as a learning environment, helping lead the way to more efficient, and hopefully cheaper plant designs.

The announcement comes as a surprise to some, as Lockheed Martin is more known for building aerospace components and craft, than for sea power projects. It's not such a stretch for the company however, as they have been investigating OTEC projects since the 1970's and were even awarded a contract from the U.S. Navy to build such a plant in Hawaii back in 2009. Plans for that project were scrapped however when officials with the Navy decided that the project would not be cost effective.

One of the main advantages of OTEC plants is that they are able to provide a steady, continuous flow of electricity, unlike plants that use wind or solar energy. The new plant will be the largest of its kind, able to generate up to 10 MW of . As part of the announcement, says the hope is that the pilot plant will be just the first of many to come, with plant sizes ranging from 10 to 100 MW.

Credit: Lockheed Martin

The two partners on the project say they are already working on the design for the new plant and expect construction to begin as early as next year.

Explore further: Generating energy from ocean waters off Hawaii

More information: Press release

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3 / 5 (2) Apr 24, 2013
I notice the video very cautious says a liquid with a low boiling point.

However the writer of the article chooses ammonia which boils at -33C. Meaning of course that while water temp can easily make ammonia boil -- it could never be used to cool it down to a liquid.

Hydrogen cyanide or hydrogen floride would have been better examples.
not rated yet Apr 24, 2013
The problem with hydrogen cyanide or hydrogen fluoride would be that if they are released into the ocean there could be a bigger problem(assuming a considerable amount is used). The primary danger is from fittings deteriorating, ships crashing into them, or deliberate sabotage.

A chemical like ether or some hydrocarbons might work, but then you'd have a chemical which is relatively safe in the air, but has an exceptional love for sparks. Maybe Lockheed-Martin have a special proprietary blend of chemicals to get the boiling point as low as they can?

What about horizontal drilling, so you can tap into the elevated sub-surface temperatures below the crust in the Pacific area? Then you could use a safer chemical with a higher boiling point(read: cheaper), and not have to worry about the other problems. You could even sink it into the ocean to protect it from the typhoons and ships in the area. Some means of steerable drilling would be nice
not rated yet Apr 24, 2013

They could use NH4 at around 38PSI where the vaporization temp is about 10 degrees F.


1 / 5 (2) Apr 24, 2013
I think there would be a lot less skepticism with temperature differential systems if they looked more like this classic one-


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