Electricity sector in Japan
The power generation in Japan was in 2008 to 27% from coal, 26% from gas, 24% from nuclear power, 13% from oil and gained 8% from hydropower.
A serious change resulted in generation but also decrease side by the tsunami and Fukushima nuclear disaster in March 2011, some even went with and after all nuclear power plants in Japan permanently or temporarily from the network. Politically, now there are more controversial in any case the electricity via nuclear power has left health in the population, scenic by radioactivity and by the continued need of care for a very long time Haverieanlage economically heavy tracks with momentum.
2008 consumes 8,507 kWh per person in Japan on average, which was 115 % compared to the EU15 per capita consumption ( EU15: 7,409 kWh / person) and 95 % compared to the OECD average ( 8,991 kWh / person).
A current - export or import takes place.
The mains frequency in the eastern part of Japan is 50 Hz, in the western part of Japan 60 Hz The difference is based from the procurement of generators from Germany by AEG in 1895 for Tokyo, which provide 50 Hz, and General Electric of USA in 1896 for Osaka, which provide 60 Hz. The different networks can not be directly connected together, HVDC close couplers ( GKK ) are used for electric power transmission on the border used. Here, a similar technology as in high-voltage direct current transmission ( HVDC), English High Voltage Direct Current ( HVDC ) is used, in contrast to the HVDC but only over a short distance within the converter station. In total, there are four short couplers with a coupling capacity of 300 MW in operation in the substation Shin- Shinano Hendensho (新 信 浓 変 电 所), Sakuma Shūhasū Henkansho (佐 久 间 周波 数 変 换 所), Minami- Fukumitsu Hendensho (南福 光 変 电 所) and the Higashi Shimizu Frequency Converter in the substation Higashi- Shimizu Hendensho.
Japan has the lowest at 100 V mains voltage ( in the lowest grid level ) worldwide. This implies there a higher power loss than if you would transmit a higher voltage, or the need for more transformers.