Aquamarine Power’s Oyster concept is "a wave-powered pump which pushes high-pressure water to drive an onshore hydro-electric turbine."

Atlantis Resource Corporation’s AR1000 is a tidal turbine fixed to the seabed. The consortium behind the concept has a goal of supplying electricity to 40,000 Scottish homes by 2020.

Flumill's double helical corkscrew device "draws power from the tidal stream as the water moves up/through the spiral turning the turbines."

Several companies are piloting Pelamis's wave technology. As waves pass down its five sections, the machine converts the movement into electricity "via hydraulic power take-off systems housed inside each joint."

Scotrenewables’ floating tidal device generates power from two turbines fixed underneath its bow. The Orkney-based company points to its "ease of installation, operations and maintenance, robustness, and survivability in the harsh offshore environment."

Seatricity's floating buoys bob up and down with the waves operating "a pump to pressurize sea water which is piped ashore."

This giant "underwater windmill" has the capacity to generate power for 1,500 homes, according to its developer Marine Current Turbines, now owned by Siemens.

Waverider buoys collect real-time wave data from EMEC’s test waters.

2012-10-09

8 Crazy Ocean Power Plants That Make Energy From The Sea

The tide is turning for marine power plants, especially in Scotland, which is serving as a test-bed for all sorts of underwater turbines and other crazy solutions to generate power from the waves and tides.

You could make a good case for Scotland being the center of the global marine energy industry. With perfect roiling seas, a well-funded testing and research hub, and consistent support from U.K. and Scottish governments, startups are experimenting with many intriguing wave and tidal devices--as the slide show of some of the most intriguing devices above testifies.

The bad news is that it’s unlikely any of these designs will produce much power before 2015. Aside from testing, the companies still have to work on bread-and-butter issues like getting power to land, rigging the devices into cost-effective "arrays," developing an installation and maintenance infrastructure, and negotiating the proper insurance.

But the good news is that it’s likely to happen some day--which is an improvement on a few years ago, when the industry looked, well, dead in the water. Startups point in particular to backing from some of Europe’s most important engineering and energy companies--names like Siemens, ABB, and Alstom, which have all made, or upped, investments recently.

An August report (PDF) said marine could produce 75 terrawatt hours per year by 2050, or about 10% of overall U.K. demand. Marine energy may still be a bit zany and a bit niche for some tastes. But Scotland, especially, is showing it has a future.

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  • Vladimir Markovic

     

    THE CHEAPEST RENEWABLE
    ENERGY SOURCES.

     

     

    Have you ever stood
    on the river coast, watching unbelievable quantities of water flowing near you
    every second, each minute, in hours, days, months and years? Can you imagine how
    much power we would need to stop this water movements or how much energy we
    would need to move such water quantity by machine power?

     

    It seems to be
    that huge amounts of energy which causes slowly movements of water masses we
    could not use – at least not with high efficiency. But, it is a case only
    if we are using classic and known water turbines which were designed only for
    high water speeds. Similar effects are to be reached also when using windmill
    propellers with high efficiency in the air and very poor efficiency when
    operating deep in to the water stream. After visiting more pages referring
    TIDAL projects like VERDANT, all VOITH – Siemens and ALSTOM designs, etc., you
    can easily find out that all of them are carrying the same disadvantages which
    are causing 12 to 20 times larger investment and operational costs, than it is
    acceptable and instead of 35 € to 40 € per MWh, are resulting with prices which
    varies between 500 € to 800 € per MWh of received power.

     

    This is forcing us
    to build the dams and artificial lakes what is in the most of cases nearly impossible,
    very expensive and ecologically always very delicate. So, the only solution was
    to design completely new type of power turbines, able to extract energy from
    slow moving water streams. After many years of experiments and development the
    SP turbines (Stagnation pressure turbines) were designed. On this project I
    have been working nearly 20 years (http://www.izumi.si).  Up to last
    year I used to develop only smaller units (SP 1) with Power up to 80 kW, but
    now days I am working with new designs (SP 2) for which I applied a new Patent
    and which are 10 times more powerful.

     

    SP 2 units are
    incomparably cheaper, technically extremely simple and designed to operate in
    river or see streams and their life time can be longer than 50 years. The units
    are placed on the bottom of the river or Sea, they are only 3 m high (instead of 15 to 30 m by known TIDAL units),
    but their horizontal diameter is very large because SP2 are propelled on radial
    way and not like other TIDAL turbines which are axially propelled. Therefore, I
    made calculations and planes for two types of SP 2 units - 22 and 32 meters of diameter –
    very convenient to be used in larger rivers or as TIDAL units – with life time
    of more than 50 years:

     

    SP 22 with 300 kW
    of Power, costs of 1,5 Million € and price for each MWh of 45 €

    SP 32 with 500 kW
    of Power, costs of 1,9 Million € and price for each MWh of 40 €

     

    In deeper water
    with height of nearly 6 m,
    capacity of each can be doubled, what means that the price for electricity can
    be lowered on 25 € to 35 € for each MWh. All is invisible from the coast, works
    without dams and ecologically is practically ideal.

     

    Interesting
    possibility: Germany
    made decision to stop operating with Nuclear Power plants. Regarding the fact
    that all Nuclear plants are located near by larger rivers (because of cooling
    needs), on river bottom we can install couple of hundreds of SP2 units and
    after changing of main turbines in Power plant, using a “ladle hand” system of
    SP2, we can propel the same generators and use all existing infrastructure to
    produce the same electric power – but without any dangerous nuclear fuel! With
    described solution, in the next decade, Germany can save more billions
    Euros of capital and remain with existing 13 GW of (today) Nuclear Power, but –
    only with clean and renewable energy.   

     

    Point is that anywhere
    in developed World, we are able to have a highest quality production of cheap
    and simple SP1 and SP2 units. But, since more years we were not in position to
    get any kind of Bank or Venture capital sources for production for thousands of
    interested customers – for Rivers or See. The same time, without any arguments
    or explained facts, bigger producers which are wasting a billions for wrong and
    too expensive solutions, are completely ignoring us and there was no one single
    case even to answer to any kind of our offers or proposals. All of them are
    producing nearly the same and wrong concepts of TIDAL units. Without any market
    competition even their prices are very similar - not for 20 % but for 20 TIMES
    to high – then is needed to be. Simultaneously, they believe that their “good
    market name” can permanently remain the only argument for highest price of
    Power – ever existing. So, is it somebody there to give us some advice, what we
    can do to be able to survive – against so strong and dirty monopolistic
    interests of the biggest Power producing companies?   

     

     

     

    Vladimir Markovic 
         

    inventions@izumi.si