Visit to Plant

'Preventive Maintenance' Through Inspection Every 2 Months at Solar Plant in Nagasaki

Impact of shade minimized, dew condensation in combiner boxes wiped away

2020/03/25 16:44
Shinichi Kato, Nikkei BP Intelligence Group, CleanTech Labo
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The "SOL de Saikai Torika," a mega- (large-scale) solar power plant with a solar panel capacity of about 1.53MW and a grid capacity of 1.5MW, is located in the mountains of the Nishisonogi Peninsula northwest of Nagasaki City (Fig. 1).

Fig. 1: Located in mountains of Torikago, Seihicho, Saikai City, Nagasaki Prefecture (source: top Chopro, bottom Nikkei BP)

As the plant name indicates, it is located in Torikago, Seihicho, Saikai City in the northern part of Nishisonogi Peninsula.

The power producer is Chopro Co Ltd (Nagayocho, Nishisonogi-gun, Nagasaki Prefecture), which deals with, among others, liquefied petroleum (LP) gas. Chopro has developed and operates many solar power plants primarily in neighboring areas mainly in Nagasaki Prefecture. It is a solar power producer, which has roots in the local community.

As its development policy, the company limits development areas in neighboring areas so that it can closely check and, in addition, has continued to use engineering, procurement and construction (EPC) services of the same provider as well as solar panels and PV inverters of the same manufacturers since its first project, deepening its relationships with these companies.

When developing its first project with an output of about 960kW in Hiradojima, Chopro secured a site but had limited knowledge about developing a large-scale solar power plant.

Accordingly, Chopro drew up the plant's basic design and specifications with the technical support of panel manufacturer Solar Frontier KK (Minato-ku, Tokyo). Kyudenko Corp took over them and constructed the plant. Since then, Chopro has developed solar power plants basically in collaboration with three companies, namely Kyudenko, Solar Frontier and Toshiba Mitsubishi-Electric Industrial Systems Corp (TMEIC), which provide EPC services, solar panels and PV inverters, respectively.

All the solar power plants that Chopro has developed from the early stage of their development are now in operation. The company says, as an option from now, it can take over and commercialize projects which meet its standards that are still being developed but have not yet begun operation.

Although Chopro has often been offered projects before their operation begins primarily in Nagasaki Prefecture and its neighboring areas, where it has accumulated experience commercializing many projects, it has actually purchased and commercialized just one project.