Clean Power USA marine energy

Published on December 29th, 2015 | by Tina Casey

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US Plows Another $10.5 Million Into Futuristic Water Mills

December 29th, 2015 by  

Marine energy fans have something new to buzz about this week, now that the US Department of Energy has dropped another round of $10.5 million in funding for next-generation technology to tap river currents as well as ocean currents, waves, and tides. The new funding is aimed at lowering the cost of the nation’s vast marine energy potential by building up durability and ease of maintenance, as well as increasing efficiency.

USA marine energy

Marine Energy: The Water Mills Of The Future

The technology to tap rivers for power goes back to the earliest water mills, and that’s the basic idea behind marine and hydrokinetic energy systems. All of these rely on the natural motion of water rather than the high pressure infrastructure required by hydroelectric dams.

While ocean-going devices have been grabbing much of the marine energy spotlight these days, the US also has an abundance of potential interior sources that could be tapped, including rivers as well as existing dams and other built infrastructure such as irrigation canals, water treatment plants, food processors, and other facilities that use large amounts of water.

This wide range of deployment dovetails with the distributed power generation strategy that the Energy Department has been pursuing under the Obama Administration. Here’s the rundown on a river-based hydrokinetic demonstration project now under way that pairs the agency with the company Ocean Renewable Power Company (ORPC):

In July 2015, ORPC deployed its RivGen® turbine in the Kvichak River, located at the Igiugig village in Alaska. The RivGen® Power System demonstration project is providing power to Igiugig, displacing power that would otherwise be generated by high-cost diesel fuel. Connecting to the small community grid and decreasing the use of diesel fuel will help lower electricity costs for consumers since all fuel must either be barged or flown in to the rural village, and that cost is passed on to rate payers.

And here’s the hydrokinetic system in action:

USA hydrokinetic and marine energy

Big Bucks For Marine Energy

With all that in mind, let’s take a look at the new round of $10.5 million for advanced marine energy systems.

The funding is divided into two groups of three. The first group focuses on ocean energy, aimed at improving the durability of wave energy converters (WECs).

Part of the funding will go to California-based Dehlsen Associates, to improve upon its multiple-pod design.

M3 Wave LLC of Oregon will also share in the pie. As the developer of an underwater WEC that harvests energy from ocean swells, it will tackle the challenges posed by shifting sediment that could displace the device. The company will also work on improving the design to reduce maintenance costs.

Another company in this group, Oscilla Power, Inc. of Washington, will work on storm-related survivability challenges faced by WECs that float on the surface.

The other three projects are aimed at improving installation, operations, and maintenance for marine energy devices:

Columbia Power Technologies, Inc., of Charlottesville, Virginia, will develop and deploy a streamlined, cost-effective installation and recovery process that includes design updates and process improvements related to IO&M, while deploying the floating, offshore WEC.

[snip]

Igiugig Village Council, in southwestern Alaska, will develop a river turbine system that will demonstrate IO&M design improvements to simplify maintenance and make system components more durable during operations.

Verdant Power, Inc., of New York, New York, will complete their TriFrame foundation, which optimizes turbine spacing and support structures to allow for cost-effective IO&M.

Marine Energy For NYC

If Verdant Power rings a bell, you’re probably thinking of the company that’s developing a major marine energy system in the East River, deep in the heart of New York City between Manhattan and Brooklyn. The turbines, shown here under construction on land, resemble stumpy wind turbines:

marine energy usa

The East River is actually a tidal strait and not a “real” river, so on the plus side its current is more consistent than an inland river, as explained by Verdant Power:

…when the water velocity exceeds approximately 1.0 m/s (3.3 ft/s, 2 knots), the turbine blades begin to rotate and the units generate electricity for about 4 hours (red areas in figure). As the tide shifts direction, the turbines yaw (turn ~170 degrees) to generate power from the current flowing in the opposite direction. This cycle repeats in a very predictable manner approximately every 6 hours. The regular nature of tidal currents provides a significant advantage for tidal power as compared to other energy systems.

Verdant has been steadily hammering away at the East River project since 2002, and it passed a major milestone in 2012, when it received a federal permit to operate. News out of the company has been rather quiet since then, but with a share of that $10.5 million in hand it looks like Verdant is gearing up for another milestone.

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Images: top (screenshot) via US Department of Energy, middle (cropped) via ORPC,  bottom (screenshot) via Verdant Power.


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About the Author

specializes in military and corporate sustainability, advanced technology, emerging materials, biofuels, and water and wastewater issues. Tina’s articles are reposted frequently on Reuters, Scientific American, and many other sites. Views expressed are her own. Follow her on Twitter @TinaMCasey and Google+.



  • Martin

    Just wondering the picture shows something looking like a wind turbine blades (for air) but since water is so much denser, why do they not use blades that look like ship blades?

    • ADW

      I suspect because one is built to be turned BY the water flow, the other is built to move a ship by pushing AGAINST the water. I recall reading that those were two very different outcomes and needed different designs.

      • milliamp

        I suspect you may be right. Compare the blades of household standing fan to that of a ship blade and you will see a lot of similarities just as the blades in the water mill resemble the design of a wind turbine.

        • Martin

          Thank you, always wondered about that (blade design).

  • Gingerbaker

    $10.5 million is about 5 minutes worth of annual U.S. fossil fuel sales. A very small drop in a very big bucket.

    And not exactly “big bucks” to be “plowed” into projects as the article states. It is a minuscule amount of money for R&D of a tech which may be crucial to the survival of civilization.

    • thinkmorebelieveless

      Hey, this is the Federal government dealing with hydro. Count your blessings, the government usually discriminates against hydro: not including hydro in the Income Tax Credit, suffocating FERC permitting for all grid tied hydro yet no FERC involvement in other grid tied renewables, etc. You are right, this is not “big bucks”. For reference, Massachusetts has a $10 million Energy Storage Initiative to support wind and solar PV (while offering no support for Micro hydro).

  • Marion Meads

    It would make for great fishing on the downriver side of the spinning blades! Bigger fish awaits for those smaller wayward fishes that were mangled by the blades or got disoriented by going through it. Then environmentalists and PETA will complain, like they do with bird strikes on windmills.

    Yet my fishing analysis will hold true. Even if they put screens around, still the turbine provides reference structure and it would still make good fishing downriver of it.

    • Bob_Wallace

      When the first tidal turbine was installed it was only run during daylight hours and only when biologists were in the water so they could collect data on damage to fish and other sea life. The plan was to monitor for a month and then evaluate whether to continue operation.

      After a couple of days they pulled the biologist and left the turbine on around the clock. There was no damage. Fish easily avoided the spinning blades.

      • JamesWimberley

        Water is much denser than air, so rotation speeds can be lower. This NREL paper (link) takes a reference design at 11.5 rpm. Wind turbines run at 15-20 rpm; but because the rotor diameter is much greater (>100m against <20m), the tip speed is very much higher.

        • Joseph Dubeau

          It isn’t the blade that is chopping.
          Birds run into windows all the time and kill themselves.
          These “Water Mills” are moving slowly.
          I doubt a fish in going to run into them.

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      • Peter Waegemans

        I suppose testing would need to be done in several locations and circumstances. Not only the location of the windmills but also possible breading and/or feeding places nearby would need to be evaluated. I doubt that the budget would cover that as well.
        I don’t oppose water energy but considering the fact that human kind has seen the oceans as the carpet under which all filth ends up for a very long time this high brow on my forehead will remain there until proven not to.

    • Joseph Dubeau

      Are you sure the noise from the “Water Mills” won’t scare the fish away?

      • As opposed to the sounds of engines and props from ships and other water craft?

        • Ronald Brakels

          Personally, I find noisy ship screws captivating.

          • I know there’s a joke there somewhere but it’s New Years Day and I’m blank. That’s my excuse and I’m sticking to it.
            Have a good 2016 everyone!!

          • Ronald Brakels

            It’s no joke! Capitvation is what makes ship screws noisy. Well, really fast screws anyway. Actually, it’s usually boat screws that are the noisest as they go faster. That white foam you see coming from a speed boat screw is made by bubbles that result from captivation.

            And Happy New Year! May the best of your past be the worst of your future!

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