The 10 Best Solar Installers in Japan (2026)
As of August 2026, SolarXList tracks 7,622 solar installers in Japan, of which 2,167 are verified (a stored record — such as a website confirmed reachable — backs the listing). The ranking below shows the top 10, ordered by verification, membership level and listing completeness.
#1
中野市, 長野県, Japan
Solar Installation / EPCInstallerEPCWebsite
#2
中央区, 東京都, Japan
Solar Installation / EPCInstallerEPCWebsite
#3
中央区, 東京都, Japan
Solar Installation / EPCInstallerEPCWebsite
#4
中央区, 東京都, Japan
Solar Installation / EPCInstallerEPCWebsite
#5
熊本市, 熊本県, Japan
Solar Installation / EPCInstallerEPCWebsite
#6
小諸市, 長野県, Japan
Solar Installation / EPCInstallerEPCWebsite
#7
香南市, 高知県, Japan
Solar Installation / EPCInstallerEPCWebsite
#8
西宮市, 兵庫県, Japan
Solar Installation / EPCInstallerEPCWebsite
#9
石岡市, 茨城県, Japan
Solar Installation / EPCInstallerEPCWebsite
#10
上伊那郡箕輪町, 長野県, Japan
Solar Installation / EPCInstallerEPCWebsite
Browse all 7,622 solar installers in Japan →
How this ranking works. This list is generated algorithmically from the SolarXList directory and refreshed daily: ① only companies with a stored verification record (for example, a website confirmed reachable by our crawler) are eligible; ② eligible companies are ordered by membership level, verification and listing completeness (contact details, description, location data). A listing can never appear here without a verification record. Are you one of these companies? Get verified →Best Solar Installers elsewhere
Frequently asked questions
Who is the best solar installer in Japan?
Based on verification status and listing completeness, ソーラープラス長野(合) currently ranks first among 2,167 verified solar installers in Japan on SolarXList.
How is this ranking calculated?
Rankings are generated algorithmically from the SolarXList directory: only listings with a stored verification record (e.g. website confirmed reachable) can appear, ordered by membership level, verification and listing completeness. No company can appear here without a verification record.
How many solar installers are there in Japan?
SolarXList tracks 7,622 solar installers in Japan, of which 2,167 are verified.
