{"id":4267,"date":"2013-06-12T15:11:40","date_gmt":"2013-06-12T15:11:40","guid":{"rendered":"http:\/\/blogs.edf.org\/energyexchange\/?p=4267"},"modified":"2013-06-12T15:11:40","modified_gmt":"2013-06-12T15:11:40","slug":"energy-from-the-sea-closer-than-you-think","status":"publish","type":"post","link":"https:\/\/blogs.edf.org\/energyexchange\/2013\/06\/12\/energy-from-the-sea-closer-than-you-think\/","title":{"rendered":"Energy From The Sea: Closer Than You Think"},"content":{"rendered":"

\"\"<\/a><\/p>\n

This commentary, authored by Rod Fujita<\/a>,\u00a0originally appeared on\u00a0EDF Voices<\/a>.\u00a0<\/em><\/p>\n

The ocean absorbs energy from the sun, stores it, and then releases it slowly.\u00a0 Sounds like a prescription for meeting the world\u2019s energy needs, since the ocean is the largest feature of our planet.\u00a0 But can ocean energy be tapped in a way that doesn\u2019t create more problems than it solves?<\/p>\n

That\u2019s the promise behind a recently announced\u00a0deal<\/a>\u00a0between Lockheed Martin and Reignwood Group, a resort developer based in Beijing. The two companies will develop a 10-megawatt power plant using ocean thermal energy conversion (OTEC) technology in waters off southern China’s Hainan Island. Construction is expected to be completed in 2017.<\/p>\n

The process<\/strong><\/p>\n

Scientists have long been interested in the potential for generating energy from the difference in temperature between warm surface waters and deep water.\u00a0 When this difference is large \u2013 for example, in tropical locations with narrow continental shelves \u2013 the warm water can be used to convert a liquid (like ammonia) into steam.\u00a0 The steam drives a turbine, producing electricity, and then is recondensed into a liquid using cold water pumped up from the deep ocean so that the cycle can be repeated.<\/p>\n

Benefits<\/strong><\/p>\n

The OTEC process can produce a number of benefits in addition to clean electricity.\u00a0 The large volumes of cold water pumped through the system can be used to cool buildings, saving on air conditioning (and associated greenhouse gas emissions from this major energy consumer).\u00a0 Lots of freshwater condenses on the cold water pipes, especially in humid tropical environments \u2013 so much that it can become a viable supplement to local water supplies or even the major water source for local communities.<\/p>\n

Because the deep ocean water pumped up to the OTEC facility is rich in nutrients and free of pathogens, it can be used to raise fish or to grow marine organisms like, microalgae for nutritional supplements.\u00a0 Doing this could actually reduce the environmental impact of OTEC, since the cold water is allowed to warm up and the nutrients and carbon dioxide can be removed by the farmed organisms.<\/p>\n

Another nice thing about OTEC is that, unlike other kinds of\u00a0renewable energy<\/a>, power production is steady and peaks in the summer months when demand is typically highest (due to air-conditioning and refrigeration needs). Some analysts estimate that a single 100-megawatt commercial scale OTEC plant would prevent about 500,000 tons of carbon from being emitted into the atmosphere and save about $130 million per year in oil costs. Although there are environmental concerns associated with OTEC, which my co-authors and I outlined in a recent paper, the potential for clean energy, drinking water and food seem quite large.<\/p>\n

Why the delay?<\/strong><\/p>\n

If OTEC is so great, why has it been in development since the late 1800\u2019s but never commercialized?\u00a0 One reason is that there are only so many suitable sites \u2013 conventional OTEC plants need to be onshore yet close to deep water, and the surface water must be quite warm.\u00a0 Another reason is that the capital costs are high while the energy yield is low \u2013 the process isn\u2019t very efficient.\u00a0 And yet another reason is that it is technologically challenging to lay a pipe long enough to reach deep water \u2013 and keep it there.<\/p>\n

Despite these challenges, scientists and engineers have remained intrigued enough with OTEC\u2019s possibilities to keep working on it for all of these decades.\u00a0 The potential sites have been expanded by using floating platforms, as with the plant Lockheed Martin is building, minimizing pipe length. Other innovations allow OTEC to extract energy from smaller temperature differentials.\u00a0 Efficiency has been increased through the use of better heat exchangers and advanced materials.\u00a0 Pipe manufacturing, laying methods and maintenance have all vastly improved.\u00a0 And while OTEC remains quite costly, the rising price of oil has made OTEC and other forms of renewable energy much more competitive in recent years, as our\u00a0paper<\/a>\u00a0outlines. These factors make me think that OTEC may be on the verge of commercialization.<\/p>\n

In fact, in our paper we\u00a0concluded<\/a>\u00a0 that the project in southern China was the missing link in commercializing OTEC.\u00a0 Several small OTEC plants have been built already, so we know that the concept produces net energy and all of the other benefits described above.\u00a0 But the costs associated with scaling OTEC up have been very uncertain, perhaps scaring off potential investors and customers up till now.<\/p>\n

Proceed with caution<\/strong><\/p>\n

OTEC is definitely not a panacea.\u00a0 Using large amounts of cold, nutrient rich water from the deep ocean in order to produce energy could have some very negative impacts, like killing sea life by sucking it into the intake pipe or creating algal blooms by discharging nutrient rich sea water into warm, nutrient-poor surface water. But these and other impacts can be\u00a0prevented or mitigated<\/a>. This new industry should be carefully regulated to ensure that the costs of safe operation are internalized by beneficiaries and not borne by all of us, on behalf of the ocean.<\/p>\n","protected":false},"excerpt":{"rendered":"

This commentary, authored by Rod Fujita,\u00a0originally appeared on\u00a0EDF Voices.\u00a0 The ocean absorbs energy from the sun, stores it, and then releases it slowly.\u00a0 Sounds like a prescription for meeting the world\u2019s energy needs, since the ocean is the largest feature of our planet.\u00a0 But can ocean energy be tapped in a way that doesn\u2019t create …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[177],"tags":[],"coauthors":[],"class_list":["post-4267","post","type-post","status-publish","format-standard","hentry","category-renewable-energy"],"acf":[],"yoast_head":"\nEnergy From The Sea: Closer Than You Think - Energy Exchange<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.edf.org\/energyexchange\/2013\/06\/12\/energy-from-the-sea-closer-than-you-think\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Energy From The Sea: Closer Than You Think - 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