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Japan: Growth in Electricity Transmission Network [free access]

September 9, 2021

At the end of 2020, Japan’s transmission network comprised about 38,315 km of transmission lines ranging between the 110 kV to 500 kV and 250 kV DC voltage levels. Since 2016, line length has witnessed low growth at a compound annual growth rate (CAGR) of 0.07 per cent.

 

Japan’s transformation capacity stood at 6,15,040 MVA by the end of 2020. Of this, 37 per cent was at 500 kV, 29 per cent was at 275 kV, and 25 per cent was at the 110 kV to 154 kV levels. The number of substations stood at 1,026.

 

 

Table 1: Growth in Japan’s transmission line network (km)

Voltage

2016 

2017 

2018 

2019E 

2020 

110-154 kV

16,513

16,548

16,548

16,548

16,553

187 kV

2,750

2,735

2,750

2,798

2,701

220 kV

2,745

2,678

2,678

2,678

2,678

250 kV

267

267

267

267

267

275 kV

8,035

8,098

8,098

8,098

8,049

500 kV

7,900

7,942

7,942

7,945

8,067

Total

38,210 

38,268

38,283

38,334

38,315

Note: Data is as of March 31 for the mentioned year. It does not include 2,143 km of J-Power’s transmission lines as we do not know the voltage-wise break-up for these lines. Data for 2019 is estimated based on historic growth rates.

Source: Organization for Cross-regional Coordination of Transmission Operators, Japan Electric Power Information Center (JEPIC)

 

                                                Figure 1: Growth in Japan’s transformer capacity (MVA)

 

Note: Data is as of March 31 for the year mentioned. Data represents capacity of transformers at voltage levels of 110 kV and above.

Source: Global Transmission Research