The proposed Manukau harbour for producing energy comes from the huge amount of water that goes though the harbour neck every day in the tow tidal directions, attached some calculations of the research for this project.
This patent is capable to produces electricity form moving water, for the primary turbine trial 2 years ago produced 400 watt per hour, this was with very basic materials and technology. Last research confirms that the turbine invented, when it is connected with a modern generator can produce 500 megawatt per hour that is equal to 4.368 Gigawatt/year for each device. In a bigger scall when we have a successful trial, we can plant as many as the harbour neck can carry, the generation of 100 devices will generate 436.8 Gigawatt/year and it can be bigger as there are no limits for generating power form big reivers. There is no need to build dams or barriers and it doesn't need water level differences before and after the device, as it functions with normal water current.