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<\/a><\/p>\nResearchers at Florida Atlantic University drew on NOAA\u2019s Global Drifter Program, pulling more than 43 million data points collected between March 1988 and September 2021. That volume of real-world measurement \u2014 not modeled estimates \u2014 is what makes the study stand out. Most previous work on ocean current energy relied on regional assessments or computational models. This is the first comprehensive global picture built entirely from observed data.<\/p>\n
The results appeared in\u00a0Science Daily<\/a> via the Florida Atlantic University.<\/p>\n Where the currents hit hardest<\/p>\n The numbers off Florida\u2019s East Coast are striking. Waters there \u2014 along with those off South Africa \u2014 consistently showed power densities above 2,500 watts per square meter. For context, an \u201cexcellent\u201d wind energy resource is classified at roughly 1,000 W\/m\u00b2. These ocean currents carry 2.5 times that energy density.<\/p>\n High-power zones don\u2019t stop at Florida. Strong readings stretch northward along the U.S. Southeast coast all the way to North Carolina. Along Africa, elevated densities run down the eastern and southeastern coastlines \u2014 Somalia, Kenya, Tanzania, Madagascar, and South Africa all appear on the map.<\/p>\n The broader picture is also encouraging. About 75% of all high-power-density ocean areas \u2014 covering roughly 490,000 square kilometers \u2014 carry between 500 and 1,000 W\/m\u00b2. That range sits below the peaks off Florida and South Africa, but it remains significant for practical energy generation.<\/p>\n Why shallow water makes all the difference<\/p>\n Raw power density is only part of the equation. Where that power sits in the water column matters just as much for anyone thinking about placing a turbine in the ocean.<\/p>\n Florida and parts of South Africa benefit from a useful combination: strong currents running through relatively shallow water, around 300 meters deep. That depth is manageable \u2014 engineers can anchor turbines there without extraordinary infrastructure<\/a>.<\/p>\n The contrast with other high-current regions is instructive. Japan and parts of South America show lower power densities at comparable depths, reducing their practical appeal. Where currents run strong in deep water \u2014 1,000 meters or more \u2014 engineering challenges multiply fast. Advanced mooring systems become necessary to keep turbines stable, and both installation and maintenance grow significantly more expensive.<\/p>\n The depth-to-power-density relationship, as the researchers put it, is a critical variable in turbine placement and design. Finding a fast current isn\u2019t enough. You need one you can actually reach.<\/p>\n Seasons, reliability, and the gaps in the data<\/p>\n Ocean currents aren\u2019t static. They shift with the seasons, and the study tracked those rhythms carefully.<\/p>\n In the Northern Hemisphere\u2019s warmer months \u2014 June through August \u2014 power densities near Florida, Japan, and northern Brazil tend to peak. That timing lines up with higher electricity demand driven by air conditioning. South Africa follows its own calendar: peak densities arrive in December through February, the Southern Hemisphere\u2019s summer. Ocean current energy could, in other words, naturally track demand cycles rather than work against them.<\/p>\n Reliability of the estimates varies by region, though. Calculations for North America and Japan were highly consistent, confirmed by comparisons with other measurement methods. South Africa and northern Brazil are harder to pin down \u2014 sparse data and variable water conditions introduce more uncertainty into those estimates. To sharpen the picture, researchers recommend targeted studies using acoustic Doppler current profilers, instruments that measure current velocity at multiple depths simultaneously and give engineers the precision needed to design submerged turbines for specific sites.<\/p>\n What comes next for ocean current energy<\/p>\n The immediate scientific priority is filling the data gaps. Brazil and South Africa both show promise, but neither has the measurement density needed to support confident engineering decisions.<\/p>\n On the applied side, FAU\u2019s Southeast National Marine Renewable Energy Center is already working to develop technologies suited to Florida\u2019s offshore current. The center\u2019s director has described Southeast Florida as one of the premier locations globally for harnessing ocean current power \u2014 and the new data gives that claim a firmer empirical foundation. The study\u2019s energy characterization data was also designed with integration in mind, so engineers working on broader renewable energy planning<\/a> can evaluate where ocean current power fits alongside wind, solar, and other sources.<\/p>\n What the research opens up is a clearer view of a resource that has always been there, running steadily offshore, largely unexamined at global scale. The currents won\u2019t wait. The question now is how quickly the technology, the investment, and the policy frameworks can catch up to what the data already shows.<\/p>\n
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