Nutrias Bite Cables, Cause Short Circuit at Floating Solar Plant
Upswing in power generation, combiner boxes set up on ground
Solar panels are floating on all three reservoirs aligned next to each other in a rice-producing area of Kato City in the center of Hyogo Prefecture, Japan (Fig. 1). The three reservoirs are called, from north to south and from the smallest to the largest, "Shinike," "Saraike" and "Oike." They are all agricultural reservoirs used to supply water to rice paddies and other fields in Yado District, Kato City.
The Nippon Comsys Group, which is engaged in telecom infrastructure, developed and operates these solar power plants.
They are the "Kato City Yado Oike Solar Power Plant (Sun Lakes Yado Kato)" with an output of about 2MW, where all panels were set up on the water, and the "Kato City Yado Solar Power Plant (Sun Factory Kawata Kato)" with an output of about 1.3MW and 71.5kW, which were set up on the ground and the water, respectively.
In the Nippon Comsys Group, Nippon Comsys Corp undertakes engineering, procurement and construction (EPC) services and operation and maintenance (O&M) services. Comsys Create Corp (Shinagawa-ku, Tokyo) runs the group's solar power plants with a total output of about 61.2MW at 19 locations as their power producer.
Just like the projects in Kato City, Nippon Comsys has undertaken EPC and O&M services while Comsys Create serves as the power producer at the other solar power plants of the Nippon Comsys Group. Excluding CIS chemical compound-type solar panels adopted at the 1.8MW-output project in Azumino City, Nagano Prefecture, crystal silicon-type solar panels of various manufacturers were adopted at all the other solar plants.
As for PV inverters, products of Toshiba Mitsubishi-Electric Industrial Systems Corp (TMEIC) were adopted at all 17 locations excluding the two with an output of about 12.7MW and 2MW at Rifucho, Miyagi Prefecture, and Ebetsu City, Hokkaido, respectively.
The three reservoirs in Kato City are all managed by a Yado local community association. Nippon Comsys rented the water surfaces and set up the solar power generation facilities there.