After the tsunami: how tidal energy could help Japan with its nuclear power problem. Japan was the third-largest producer of nuclear power in the world in 2011. Then, on March 11 of that year, an earthquake of magnitude 9 was followed by a catastrophic tsunami, resulting in the first nuclear disaster of the 21st century – at the Fukushima Daiichi power station. The country’s nuclear plants were shut down, and within a year Japan had become the world’s second biggest importer of fossil fuels. But on a group of islands to the west, tidal power may offer part of the solution to the country’s energy needs. By 2030, the Japanese government plans once more for nuclear power to provide around 21% of the nation’s electricity – which is highly controversial – but also stipulates (see page 8) that 22-24% should be delivered by renewable energy sources. At a local scale, two prefectural governments, Fukushima and Nagano, have pledged that all of their electricity will come from renewables by 2050.Most of the new renewable energy available in 2030 is likely to be solar and wind, along with existing hydropower, but some contribution from the tides is possible. To this end, a zone in the Goto Islands of Nagasaki Prefecture has been designated for tidal energy development, and a cluster of companies plans to install the first turbine in 2019. This project will be of the tidal stream type, where underwater turbines are placed in the free flow without any dam or barrage, similar to the MeyGen project in Scotland.
The Conversation 10th Jan 2018 read more »