Electricity sector in Japan

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Electricity production in Japan by source. Electricity production in Japan.svg
Electricity production in Japan by source.
Electricity sector of Japan
Data
Production (2014)995.26 TWh
Share of renewable energy 9.7% (2009)

The electric power industry in Japan covers the generation, transmission, distribution, and sale of electric energy in Japan. Japan consumed approximately 918 terawatt-hours (TWh) of electricity in 2014. [1] Before the 2011 Fukushima Daiichi nuclear disaster, about a quarter of electricity in the country was generated by nuclear power. In the following years, most nuclear power plants have been on hold, being replaced mostly by coal and natural gas. Solar power is a growing source of electricity, and Japan has the third largest solar installed capacity with about 50 GW as of 2017. Japan's electricity production is characterized by a diverse energy mix, including nuclear, fossil fuels, renewable energy, and hydroelectric power.

Contents

Japan has the second largest pumped-hydro storage installed capacity in the world after China.[ citation needed ]

The electrical grid in Japan is isolated, with no international connections, and consists of four wide area synchronous grids. Unusually the Eastern and Western grids run at different frequencies (50 and 60 Hz respectively) and are connected by HVDC connections. This considerably limits the amount of electricity that can be transmitted between the north and south of the country.

During the Second Sino-Japanese War and the succeeding Pacific War, the entirety of Japan's electricity sector was state-owned; the system at the time consisted of a Japan Electric Generation and Transmission Company ( 日本発送電株式会社, Nippon Hassōden kabushiki gaisha, otherwise known as Nippon Hassōden KK or Nippatsu) and several electricity distributors. At the behest of the Supreme Commander for the Allied Powers, Nippon Hassōden became the Electric Power Development Co., Limited in the fifties; and almost all of the electricity sector that are not under the control by EPDC was privatized into nine government-granted monopolies. The Ryukyu Islands electricity provider was, during the USCAR era, publicly owned; it was privatized shortly after the islands' admission into Japan.

Consumption

In 2008, Japan consumed an average of 8507 kWh/person of electricity. That was 115% of the EU15 average of 7409 kWh/person and 95% of the OECD average of 8991 kWh/person. [2]

Electricity per person in Japan (kWh/ hab.) [2]
UseProductionImportImp. %Fossil Nuclear Nuc.  %Other RE Bio+waste* Wind Non RE use* RE  %
20048,4598,45905,2572,21226.1%8441467,46911.7%
20058,6338,63305,3782,38727.6%7151537,76510.1%
20069,0429,04206,1052,06622.8%7161548,1719.6%
20088,5078,50705,6692 01023.6%6821477,6799.7%
20098,1698,16905,1782,19826.9%637*12827*7,3779.7%
* Other RE is waterpower, solar and geothermal electricity and wind power until 2008
* Non RE use = use – production of renewable electricity
* RE % = (production of RE / use) * 100% Note: European Union calculates the share of renewable energies in gross electrical consumption.

Compared with other nations, electricity in Japan is relatively expensive. [3]

Liberalization of the electricity market

Since the Fukushima Daiichi nuclear disaster, and the subsequent large scale shutdown on the nuclear power industry, Japan's ten regional electricity operators have been making very large financial losses, larger than US$15 billion in both 2012 and 2013. [4]

Since then steps have been made to liberalize the electricity supply market. [4] [5] In April 2016 domestic and small business mains voltage customers became able to select from over 250 supplier companies competitively selling electricity, but many of them sell only locally, mainly in large cities. Also wholesale electricity trading on the Japan Electric Power Exchange (JEPX), which previously traded only 1.5% of power generation, was encouraged. [6] [7] By June 2016 more than 1 million consumers had changed supplier. [8] However total costs of liberalization to that point were around ¥80 billion, so it is unclear if consumers had benefited financially. [8] [9]

In 2020 transmission and distribution infrastructure access will be made more open, which will help competitive suppliers cut costs. [8]

Transmission

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Map of Japan's electricity transmission network, showing differing systems between regions Power Grid of Japan.svg
Map of Japan's electricity transmission network, showing differing systems between regions

Electricity transmission in Japan is unusual because the country is divided for historical reasons into two regions each running at a different mains frequency. [10] Eastern Japan has 50 Hz networks while western Japan has 60 Hz networks. [10] [11] Limitations of conversion capacity causes a bottleneck to transfer electricity and shift imbalances between the networks. [10] [11]

Eastern Japan (consisting of Hokkaido, Tohoku, Kanto, and eastern parts of Chubu) runs at 50 Hz; Western Japan (including most of Chubu, Kansai, Chugoku, Shikoku, and Kyushu) runs at 60 Hz. [10] [12] That originates from the first purchases of generators from AEG for Tokyo in 1895 and from General Electric for Osaka in 1896. [13] [14]

The frequency difference partitions Japan's national grid and so power can be moved only between the two parts of the grid using frequency converters, or HVDC transmission lines. The boundary between the two regions has four back-to-back HVDC substations, which convert the frequency: Shin Shinano, Sakuma Dam, Minami-Fukumitsu, and the Higashi-Shimizu Frequency Converter.[ citation needed ] The total transmission capacity between the two grids is 1.2 GW. [15]

The limitations of these links have been a major problem in providing power to the areas of Japan affected by the Fukushima Daiichi nuclear disaster. [13] During the 2011 Tōhoku earthquake and tsunami, there were blackouts in some areas of the country because of the insufficient ability of the three HVDC converter stations to transfer energy between both networks. [12]

A few projects are underway to increase the electricity transfer between the 50 Hz (eastern Japan) and 60 Hz networks (western Japan) which will improve power reliability in Japan. [11] In April 2019, Hitachi ABB HVDC Technologies secured an HVDC order for the Higashi Shimizu project to increase the interconnection capacity between the 60Hz area of Chubu Electric and the 50Hz area of TEPCO from 1.2GW to 3GW. [11] Chubu Electric will increase the interconnection capacity of the Higashi Shimizu Substation from 300MW to 900MW which should be operational by 2027. [11] OCCTO (Organization for Cross-regional Coordination of Transmission Operators) supervises the power interchange among electric power companies. [11]

Mode of production

Gross production of electricity by source in Japan (TWh) [16] [17] [18] [19] [20] [21] [22] [23]
YearTotalCoalGasOilNuclearHydroSolarWindGeothermal
20041,12129426.2%25622.9%16915.0%28225.2%1039.2%
20081,10830027.1%29226.3%15413.9%25823.3%847.5%
20091,07529027.0%30228.1%989.1%28026.0%847.8%
20101,14831027.0%31927.8%1008.7%28825.1%917.9%3.8000.33%3.9620.35%2.6470.23%
20111,08229126.9%38835.8%16615.4%1029.4%928.5%5.1600.48%4.5590.42%2.6760.25%
20121,06431429.5%40938.4%19518.3%161.5%847.9%6.9630.65%4.7220.44%2.6090.24%
20131,06634932.7%40838.2%16015.0%90.9%858.0%14.2791.34%4.2860.4%0.2960.03%
20141,04134933.5%42140.4%11611.2%00%878.4%24.5062.35%5.0380.48%2.5770.25%
20151,00934234.0%39639.2%919.0%90.9%858.4%35.8583.55%5.160.51%2.5820.26%

According to the International Energy Agency, Japanese gross production of electricity was 1,041 TWh in 2009, making it the world's third largest producer of electricity with 5.2% of the world's electricity. [24] [25] After Fukushima, Japan imported an additional 10 million short tons of coal and liquefied natural gas imports rose 24% between 2010 and 2012. In 2012 Japan used most of its natural gas (64%) in the power sector. [26]

Nuclear power

The 2011 Fukushima Daiichi nuclear disaster, the worst nuclear accident in 25 years, displaced 50,000 households after radiation leaked into the air, soil and sea. Radiation checks led to bans of some shipments of vegetables and fish. Fukushima I by Digital Globe crop.jpg
The 2011 Fukushima Daiichi nuclear disaster, the worst nuclear accident in 25 years, displaced 50,000 households after radiation leaked into the air, soil and sea. Radiation checks led to bans of some shipments of vegetables and fish.
Anti-Nuclear Power Plant Rally on 19 September 2011 at Meiji Shrine complex in Tokyo. Anti-Nuclear Power Plant Rally on 19 September 2011 at Meiji Shrine Outer Garden 03.JPG
Anti-Nuclear Power Plant Rally on 19 September 2011 at Meiji Shrine complex in Tokyo.

Nuclear power was a national strategic priority in Japan. Following the 2011 Fukushima nuclear accidents, the national nuclear strategy is in doubt due to increasing public opposition to nuclear power. An energy white paper, approved by the Japanese Cabinet in October 2011, reported that "public confidence in safety of nuclear power was greatly damaged" by the Fukushima disaster, and it calls for a reduction in the nation's reliance on nuclear power. [29]

Following the 2011 accident, many reactors were shut down for inspection and for upgrades to more stringent safety standards. By October 2011, only 11 nuclear power plants were operating in Japan, [30] [31] [32] and all 50 nuclear reactors were offline by 15 September 2013. That left Japan without nuclear energy for only the second time in almost 50 years. [33] Carbon dioxide emissions from the electricity industry rose in 2012, reaching levels 39% more than when the reactors were in operation. [34]

Sendai 1 reactor was restarted on 11 August 2015, the first reactor to meet new safety standards and be restarted after the shutdown. [35] As of July 2018, there are nine reactors that have been restarted. [36]

Hydro power

Hydroelectricity is Japan's main renewable energy source, with an installed capacity of about 27 GW, or 16% of the total generation capacity, of which about half is pumped-storage. The production was 73 TWh in 2010. [37] As of September 2011, Japan had 1,198 small hydropower plants with a total capacity of 3,225 MW. The smaller plants accounted for 6.6 percent of Japan's total hydropower capacity. The remaining capacity was filled by large and medium hydropower stations, typically sited at large dams.

Other renewables

Benjamin K. Sovacool estimated that Japan has a total of "324 GW of achievable potential in the form of onshore and offshore wind turbines (222 GW), geothermal power plants (70  GW), additional hydroelectric capacity (26.5 GW), solar energy (4.8 GW) and agricultural residue (1.1 GW)." [38]

One result of the Fukushima Daiichi nuclear disaster could be renewed public support for the commercialization of renewable energy technologies. [39] The Japanese government announced in May 2011 a goal of producing 20% of the nation's electricity from renewable sources, including solar, wind, and biomass, by the early 2020s. [40] In August 2011, the Japanese Government passed a bill to subsidize electricity from renewable energy sources. The legislation will become effective on 1 July 2012, and require utilities to buy electricity generated by renewable sources including solar power, wind power and geothermal energy at above-market rates. [41]

In 2011 Japan planned to build as many as 80 floating wind turbines off Fukushima by 2020. [42] In 2020, seven years after the world's first pilot floating wind turbine was installed off Fukushima in 2013, the Japanese government announced its withdrawal from the offshore wind farm. [43]

Power stations

Grid storage

Japan relies mostly on pumped storage hydroelectricity to balance demand and supply. As of 2014, Japan has the largest pumped storage capacity in the world, with over 27 GW. [44]

See also

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References

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  2. 1 2 Energy in Sweden, Facts and figures, The Swedish Energy Agency, (in Swedish: Energiläget i siffror), Table: Specific electricity production per inhabitant with breakdown by power source (kWh/person), Source: IEA/OECD 2006 T23 Archived 4 July 2011 at the Wayback Machine , 2007 T25 Archived 4 July 2011 at the Wayback Machine , 2008 T26 Archived 4 July 2011 at the Wayback Machine , 2009 T25 Archived 20 January 2011 at the Wayback Machine and 2010 T49 Archived 16 October 2013 at the Wayback Machine .
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  30. ↑ Stephanie Cooke (10 October 2011). "After Fukushima, Does Nuclear Power Have a Future?". New York Times.
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  32. ↑ Hiroko Tabuchi (13 July 2011). "Japan Premier Wants Shift Away From Nuclear Power". New York Times.
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