Driftwood was removed first, followed by mud and crops. Crops had to be removed carefully because many of them were tangled around the mounting systems.

Mud on top of the ground was collected and removed by bulldozers before leveling the land. Some of the foundations and mounting systems were pulled upward and bent. They were demolished and removed.

It took more than three months before completion of the restoration work at the end of 2016.

The Tokachi region has less snow compared with other regions in Hokkaido, but operations excluding assembly of mounting systems and installation of panels are difficult in the snow season. The company wanted to finish the operations on the ground surface before the end of the year.

Secondary concrete products for the foundations were partially replaced having waited for production by a concrete company (Fig. 14).

Fig. 14: Some of the foundations replaced. Secondary concrete products are used in this area. The picture was taken on August 7, 2017 after the restoration. (source: Nikkei BP)

The mounting systems were carefully disassembled and removed, and parts such as steel pillars were checked for the possibility of reuse for reassembly. Some of the pillars were slightly distorted, but the number of reused parts was increased through efforts in the construction work.

The coldest month in the Tokachi region is February. The efficiency of mounting system assembly and solar panel installation operations declines in line with the temperature. However, construction was carried out quickly even during the cold season to reduce any loss by connecting to the grid again as soon as possible.