Visit to Plant

Sharp Contrast in Solar Power Generation Amounts on 2 Islands (page 3)

Panels inspected on-site

2019/07/19 23:03
Shinichi Kato, Nikkei BP Intelligence Group, CleanTech Labo
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Favorable power generation at Ukishima, serious downswing from estimate at Ohgishima

During the eight years since the operation started, the amounts of power generation have been significantly different between the mega-solar plants on Ukishima and Ohgishima. At the plant on Ukishima, the amount has always significantly outperformed the estimate in the planning phase since it began operation.

Compared with the expected annual power generation of about 7,400MWh, all the results marked a large upswing after the first year (about 5,340MWh), when the plant only operated for four months, followed by about 9,690MWh in fiscal 2012, about 9,510MWh in fiscal 2013, about 9,300MWh in fiscal 2014, about 8,920MWh in fiscal 2015, about 8,910MWh in fiscal 2016, about 9,360MWh in fiscal 2017 and about 9,210MWh in fiscal 2018.

At the Ohgishima Solar Power Plant, on the other hand, power generation has fallen far short of the estimate in the planning phase since its sixth year. The rate of decline has also expanded year by year.

Compared with the expected annual power generation of about 13,700MWh, the results after the first year (about 3,760MWh), when the plant only operated for one month, went above the estimate until its third year to 15,330MW in fiscal 2012 and about 15,350MWh in fiscal 2013. However, power generation was almost on par with the estimate at about 13,900MWh in fiscal 2014, 10 to 15% below the estimate at about 12,530MWh in fiscal 2015, 11,930MWh in fiscal 2016, about 11,630MWh in fiscal 2017 and even 24% below the estimate at about 10,420MWh in fiscal 2018.

Situated next to each other, both mega-solar plants' surrounding environment and weather conditions are considered to be almost the same. It is very interesting that, despite such circumstances, the contrast has grown so clear in the amounts of power generation at these two plants over the years since they began operation.

However, it is unknown why power generation has sharply decreased at the Ohgishima Solar Power Plant since its fourth year because TEPCO HD has refused to provide any further information other than the power generation amount it has revealed thus far. The company seems to be currently analyzing influencing factors.