8 May 2015


Top 20+ Japanese solar PV plants in pipeline or under construction

Author: Ayumi Suzuki, Solarplaza

For this reason, as part of our preparation for the conference Solar Asset Management Asia (June 24-25, Tokyo), we have created an overview of the 23 largest PV projects in Japan that have plans to be realized in a few years.

The Top 10

# Name Size (MWp) Location Operation Construction
1 Ukujima Mega Solar Park 480 Ukujima, Sasebo City, Nagasaki Unknown 2015
2 Setouchi Mega-Solar Project 231.44 Setouchi City, Okayama Second Quarter (2019) October (2014)
3 Eurus Rokkasho Solar Park 148 Rokkasho Village, Kamikita District, Aomori November (2015) August (2013)
4 SoftBank Tomatoh[Tomatou] Abira Solar Park 111 Abira Town, Yufutsu District, Hokkaido Winter (2015) Octorber (2013)
5 Watari Town Mega Solar Project 100 Watari Town, Watari District, Miyagi Unknown Unknown
6 Minamisoma City Mega Solar 100 Minamisoma City, Fukushima 2015 2012
7 Pacifico Energy Hosoe Mega-solar Project 96.2 Hosoe, Miyazaki City, Miyazaki Second Quarter (2018) March (2015)
8 Fukushima Nishigo Village Mega Solar Power Plant 76.5 Nishigo, Nishishirakawa District, Fukushima 2015 Unknown
9 Kamikita Rokkasho Photovoltaic Power Plant 71 Rokkasho Village, Kamikita District, Aomori The End of 2016 April (2014)
10 Niigata Yotsugoya Mega-Solar Power Plant 54.569 Yotsugoya, Nishi Ward, Niigata City, Niigata June (2018) June (2015)

Some interesting observations from this overview

Most of these plants are to be completed in 2015 or 2016
Of the plants in this overview on which we have information, 33% will be completed in 2015, 38% is to be completed next year, and the remaining 28% is planned to be completed by 2017 or later (including the Setouchi Mega-Solar Project in the Okayama prefecture).

Most of the largest approved plants are in the Tohoku area
While in the overview of largest operating plants 18 out of the 25 plants are located in the Kyushu area, of the largest plants approved 10 will be constructed in the Tohoku area.

Many different stakeholders   

Of the companies working on development of these projects, a few names are recurrent: ORIX, SB energy, Mitsui & Co ltd, Virginia Solar Group, GE Energy Financial Services.

EPC by Toyo Engineering

Japanese company Toyo Engineering is planning to provide EPC services for at least three plants in this overview (based on the information we have). Interestingly, Toyo Engineering has not been providing EPC services for any of the largest plants in Japan already in operation until now. This could indicate a strong entry in the PV space, or an increased focus on large scale PV plants.

TMEIC is very well represented

Just as in our overview of operational plants, TMEIC is playing an important role. Based on the information we have been able to obtain, the company is involved as an inverter provider for at least 6 of the plants in this overview.  

We leave it to the readers to draw further observations and conclusions, so feel free to comment on this article and share it. Stay in the loop for further Top-X articles we are working on (including an overview of PV portfolios), or let us know any suggestions for such overviews.

To learn more about international experiences with the operational phase of PV plants, make sure to attend the conference Solar Asset Management Asia ( June 24-25 in Tokyo). Please visit for more information. 


The Top 10 and Top 23 overview of Japanese solar PV projects under development is provided by Solarplaza International BV ("Solarplaza") as a service to its readers/customers on an "as-is, as-available" basis for informational purposes only. Solarplaza assumes no responsibility for any errors or omissions in these materials. Solarplaza makes no commitment to update the information contained herein.

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