GEMSTAR, the Ocean Kite, is a large-scale technology for the generation of electricity from slow-moving flows of water, namely river, tidal or water currents in general.
Thanks to an innovative design, it is unique among renewable energy generators.
An Italian excellence, developed over the last decade, which combines competitiveness and environmental sustainability offering a clean and efficient solution on both the national and international market.
The first studies were carried out at the University of Naples “Federico II” by the ADAG research group under the direction of Prof. Domenico Coiro. Focused on overcoming the obsolete technology widespread at a prototype or pre-industrial level, the GEMSTAR has one goal: to produce as much electricity as possible at the lowest possible costs - and in an environmental friendly and reliable way.
By focusing resources and outstanding know – how, GEMSTAR is strongly competitive on the highly regulated and competitive energy market, typically distinguished by environmental uncertainty and where on going technology is strongly demanded.
The Gemstar Project
GEMSTAR consists of two counter-rotating turbines, mounted on the sides of a submerged structure that contains the electronic components. The tail planes guarantee longitudinal and lateral-directional stability and the whole system is capable of continuously aligning itself to the flow even during the tide inversion.
GEMSTAR is held in position, at the desired depth, by means of an tethering system to the bottom consisting of a winch, an anchoring screw in the seabed and a mooring cable.
Thanks to the possibility of choosing the operational depth, GEMSTAR will always intercept the best quality of the current flow and its maximum velocity on the site, also allowing the vessel pass trough
During operation, GEMSTAR behaves like a sort of submarine kite that remains fixed thanks to the balance between the thrust acting on the turbine and the structure, and buoyancy force of the hollow part of the structure.
For maintenance , GEMSTAR can be brought to the surface releasing the tension of the mooring line; also, an heading direction control system avoids the uncontrolled rotation around the vertical axis and the related possible excessive twisting of the mooring and power cables.
Placed in a dominant position compared to international competitors, GEMSTAR overcomes the blocking elements that characterize the obsolete prototypes offered on the European and global market.
No visual impact
Gemstar is completely immersed, therefore it does not determine any visual or landscape impact and is by no means an obstacle to marine navigation
Reliability and efficiency
By being able to adjust the operating depth, GEMSTAR is always positioned below the water column affected by waves and storms and therefore intercepting the fastest currents in order to maximize annual energy production.
Easy and inexpensive maintenance
The automatic sinking system allows GEMSTAR to rise to the surface, controlled remotely, when maintenance is required. Major repair works can therefore be made on site or by transporting the system to the dock, without resorting to divers, RVs or ships with cranes.
TRL 8 - 7
TRL 6 - 5
100 kW Gemstar Datasheet
Length: 9.2 m
Height: 5.2 m
Width: 10.4 m
Total weight: 10700 kg
Buoyancy force: 5200 kg
Depth (range): 15 m to 9.8 m (without current)
Nominal power: 100 kW with a tidal current of 2.6 m/s
Three-blades 3 m diameter rotor
Innovating blade section profiles
Carbon blades - Fiberglass diffuser
Rated rotation speed: 65 rpm
Rotor Efficiency: 0.8
Expected average yearly production with 2.5 m/s maximum speed site: 300 MWh
Moving forward towards the construction of TRL8 300 kW prototype to be installed in the Strait of Messina requires significant associates. Partnerships are key to the next step in Gemstar’s future. We are only 12 months away from lighting up the future together.
Pledged: 2 mln €
Seeking : 1 mln €