A 200 MW tidal power plant is being proposed in New Zealand. The US$400 million Crest Kaipara Energy Project, to be completed in 2011, if started as planned next year, would be located in the Kaipara harbor in New Zealand and generate 4% of New Zealand's power.
Crest Energy is developing the project that will place 200, 1 MW, 22m-high marine turbines, rotating at 5 rpm, in one of the largest harbors in the world. The turbines will located in the deepest part of the channel, submerged an average of 30 meters, 15 meters at low tide. The channel is rarely used for commercial purposes due to shifting sand bars and treacherous tides, and there are no large communities close to the shores of the harbor which makes it a good location for the project.
Two 30km-long cables 125mm in diameter would carry electricity from the turbines to a substation at the entrance to the Hoteo River near Glorit, south-west of Wellsford, where it would be fed into the national grid.
Annual revenue from 200 operational turbines would be about $110 million at present wholesale electricity prices.