The tidal industry is in its commercial phase, its greatest challenge being high energy costs.
In order to lower our energy costs in line with other renewable sources, we have cut costs in all areas and have increased the lifetime of the tidal power plant. We have also more than doubled energy production in relation to in-stream tidal turbines.
The EU has set a goal for the energy sector to lower energy costs to 10 cent Euro by 2030. It seems the majority of the sector believe the way to achieve this is to follow in the footsteps of wind energy where lower energy price is achieved through the development of larger turbines.
We believe in using an optimal turbine size which gives the best cost per kw, which in turn would mean a ten fold materials savings of the turbine.
Instead of using a costly pitch on the turbine blades, we chose to use a complete propellor and rotate the turbine by 180 degrees as the tide turns.
In order to cut costs we use concrete which is a lower cost building material in the power plant turbine house. By using concrete, we also increase the lifetime of the power plant. Concrete is also a material which provides the necessary anchorage of the tidal power plant to the seabed, thereby enabling a cost saving for the tidal power plant. The power plant turbine house is designed like a Venturi duct which when placed in a 4x4 grid would increase energy production by 215%. We are also the only tidal power company to develop an automated washing unit which keeps the turbine house free from marine growth, which otherwise is a big problem for the sector.
We can regulate the speed of the tide water flowing through the turbine by sliding the turbine axially in the turbine house which enables us to have full energy even in spring and storm tides.
By stacking a large number of turbines in the tidal power plant we thereby increase the power plants reliability and we can maintain high energy production even if a few turbines malfunction.
We can upscale the power plants size by placing the turbine houses alongside each other and above each other. Furthermore, access can be obtained to each individual turbine for service and replacement.
The University of Stavanger, our R&D partner, has verified the tidal power plant from a hydrodynamics perspective via a CFD simulation. This work has been supported by VRI Rogaland in the amount of 150,000 NOK.
The illustration below is a CFD image showing the water velocity true the turbine house.
The tidal power plant is patented in Norway and is patent pending in Canada, China, South Korea, Australia, New Zealand, USA and EP. The company is looking to the international market.
We are currently working to realise a pilot project by the summer 2020, with the pilot being a "stand alone" turbine house with an inner diameter of 3.1m and an outer diameter of 5m with a length of 6m.
A "stand alone" turbine house could be a suitable power plant for a fish farming business, power production for remote land areas/islands which need to strengthen their energy security or to make the change from fossils to renewables.
Below is a sketch illustrating a "stand alone" turbine house with an installed turbine. The first figure views from the front, the second from the side and the last figure is a sectional view of The Cube (viewed from left to right).
Following the pilot, we plan to realise a turbine house designed to be stacked into a turbine block with the purpose of increasing the degree of utilisation from a tidal stream. Our power plant is flexible and can be designed in several ways in order to utilise the tidal site in the best possible way. The power plant can be designed for ROV operation or fully automated operation according to the size of the power plant and the customers needs.
We believe that in the future we will achieve our best energy cost from a fully automated tidal power plant, as we will be able to operate and service the plant without costly vessels.
Norwegian Tidal Solutions patented tidal power plant can be designed in several different ways in order to optimise the utility of the actual tidal stream.
The figure below shows a fully automated submerged tidal power plant consisting of a large number of turbine houses each with their own installed turbine. This plant would create no visual or sound pollution and boat traffic could pass over the plant as normal. The first house we can see on land is a service hall for the maintenance of the power plants turbines.
The service hall also houses a robot which can retrieve the turbines from the power plant when service is required. The second house we see on land is the power plants power station where the automatic connection and disconnection of the turbines is controlled.
We will transfer the technology from the oil and gas industry to make the tidal energy sector competitive on price compared with other renewable energy.
Norwegian Tidal Solutions patented tidal power plant will also be able to utilise ocean currents where the current is approximately the same day after day, year after year and can be viewed as a river that flows in the sea.
Possibly the most well known ocean current is the Gulf Stream which has a strength of 40 Sverdrup (1 Sverdrup = 1 million cubic meters of water per second) outside of Cape Hatteras on the east coast of the USA and in comparison, the run off from all of the worlds rivers combined amounts to 1.2 Sverdrup.