IEEE Power & Energy Magazine - November/December 2020 - 49

tailed only after a reduction of biomass energy generation
because biomass fuel is regarded as energy that can be stored.
On 13 October 2018, Kyushu's transmission operator
made the first renewable generation curtailment in Japan.
As shown in Figure 5, 0.93 GW of PV and wind generation
were restricted under the following conditions at 12 p.m.:
7.3 GW of power demand, 4.5 GW of baseload generation,

capacity deployment share with other share indexes in Kyushu.
The figure shows that Kyushu, which has approximately 10%
of the total land area, population, and power demand in
Japan, has roughly 20% of the country's PV/wind generation.
The reasons for such large shares of PV generation in
Kyushu are the suitable conditions of lower land prices and a
relatively greater solar irradiance than other areas in Japan.

System Operation
Challenges in Kyushu
120
100

Capacity (GW)

In Japan, the FIT program en--
forces priority dispatching of
renewable generation in all balancing areas; however, to maintain
the quality and stability of power
system operations in each balancing area, when the supply and
demand balance is in danger, the
generation of renewable energy
can be curtailed. Renewable generation can be curtailed in a balancing area only after all the thermal
generation, PSH plants, and interconnections have been dispatched
to minimize the restriction under
stability and quality constraints.
Among the renewable energy systems, PVs and wind can be cur-

80

Solar PV
Wind
Geothermal
Biomass
Hydro
Renewable Generation
Ratio (Right Axis)
10.4%

10%

18
16%
14.3%

14.6%

15

12.5%
12

10.9%

60

9

40

6

20

3

0

2011

2012

2013

2014

2015

2016

2017

Renewable Generation Ratio (%)

Renewable Energy
Curtailment

0

(Fiscal Year)

figure 1. Renewable generation deployment in Japan. (Source: METI; used with
permission.)

Okinawa EPCO
(Prefecture Area) Okinawa
Standard
Frequency
60 Hz

Hokkaido EPCO

Standard
Frequency
50 Hz

Tohoku EPCO

Hokuriku EPCO
Chugoku EPCO

Tokyo EPCO

Chubu EPCO
Kyushu EPCO

Shikoku EPCO

Kansai EPCO

figure 2. The 10 balancing areas in Japan. Kyushu EPCO (circled) is the focus of this article.
november/december 2020	

ieee power & energy magazine 	

49



IEEE Power & Energy Magazine - November/December 2020

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - November/December 2020

Contents
IEEE Power & Energy Magazine - November/December 2020 - Cover1
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IEEE Power & Energy Magazine - November/December 2020 - Cover3
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