🏆 RANKINGLIVEUpdated 2026-04-19 · Based on PVFinder search volume

Top 50 Solar Installers in Japan 2026

The most-searched solar installers in Japan on PVFinder, ranked by buyer views, certifications, and operating scale. Updated daily. Mature market with 85+ GW installed; FIT-to-FIP transition reshapes new project economics.

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Methodology: Rankings blend buyer view counts (60%), verified certifications (20%), and employee range (20%). Sponsored companies marked separately.

Rank	Company	Country	Employees	Action
1	3 310 Densetsu Japan · Yamanashi	Japan	—	Inquire
2	A A&Vein Japan · Niigata	Japan	—	Inquire
3	A A-Style Japan · Saitama	Japan	—	Inquire
4	A A.S.K Japan · Nara	Japan	—	Inquire
5	A ABC Japan · Ehime	Japan	—	Inquire
6	A ABE Electrical Construction Japan · Hyogo	Japan	—	Inquire
7	A AC Japan · Yamagata	Japan	—	Inquire
8	A ADK Japan · Hokkaido	Japan	—	Inquire
9	A ANEST Japan · Wakayama	Japan	—	Inquire
10	A AOI ES Japan · Fukui	Japan	—	Inquire
11	A APC Maintenance Japan · Chiba	Japan	—	Inquire
12	A ARC Japan · Hokkaido	Japan	—	Inquire
13	A ATCL Japan · Hyogo	Japan	—	Inquire
14	A AZ Corporation Japan · Hyogo	Japan	—	Inquire
15	A Abe System Japan · Aomori	Japan	—	Inquire
16	A Abedenko Japan · Yamagata	Japan	—	Inquire
17	A Ace Reform Japan · Nagano	Japan	—	Inquire
18	A Act Ecotech Japan · Aichi	Japan	—	Inquire
19	A Active Mate Japan · Osaka	Japan	—	Inquire
20	A Adachi Industry Japan · Nagasaki	Japan	—	Inquire
21	A Adamac Japan · Hokkaido	Japan	—	Inquire
22	A Admix Line Japan · Osaka	Japan	—	Inquire
23	A Advance Japan · Tokyo	Japan	—	Inquire
24	A After Plus Japan · Kagoshima	Japan	—	Inquire
25	A Agata Japan · Shiga	Japan	—	Inquire
26	A AiNERGY Japan · Fukushima	Japan	—	Inquire
27	A Aiko Japan · Kanagawa	Japan	—	Inquire
28	A Aikyo Home Japan · Tokyo	Japan	—	Inquire
29	A Aises Japan · Akita	Japan	—	Inquire
30	A Aisystem Japan · Shizuoka	Japan	—	Inquire
31	A Aiwa Denki Kogyo Japan · Osaka	Japan	—	Inquire
32	A Aizu Electric Power Japan · Fukushima	Japan	—	Inquire
33	A Akahori Japan · Fukui	Japan	—	Inquire
34	A Akaoshoji Japan · Gunma	Japan	—	Inquire
35	A Akaritec Japan · Niigata	Japan	—	Inquire
36	A All-Wide Japan · Tokyo	Japan	—	Inquire
37	A Alma Japan · Osaka	Japan	—	Inquire
38	A Alpha Japan · Kanagawa	Japan	—	Inquire
39	A Alpha System Japan · Tokyo	Japan	—	Inquire
40	A Alphasystem Japan · Aichi	Japan	—	Inquire
41	A Alsys Japan · Tochigi	Japan	—	Inquire
42	A Altenergy Japan · Tokyo	Japan	—	Inquire
43	A Aman Construction Japan · Kagoshima	Japan	—	Inquire
44	A Amateras Solar Japan · Tokyo	Japan	—	Inquire
45	A Amedia Japan · Tottori	Japan	—	Inquire
46	A Amicable Service Japan · Ibaraki	Japan	—	Inquire
47	A Anjyo Electric Engineering Japan · Aichi	Japan	—	Inquire
48	A Anshindenki Japan · Nagasaki	Japan	—	Inquire
49	A Aoki Japan · Ibaraki	Japan	—	Inquire
50	A Aokidengyo Japan · Mie	Japan	—	Inquire

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Frequently Asked Questions

What certifications should a solar installer have?

Key certifications vary by market: MCS (UK residential), CEC (Australia), NABCEP (USA), RGE (France), InstallateurEB (Germany). For commercial/utility projects, look for ISO 9001 + technology partner credentials (SMA, SunGrow, etc.).

What's the difference between installer and EPC?

Installer focuses on residential/small commercial (up to ~500 kW). EPC (Engineering, Procurement, Construction) handles larger commercial and utility-scale projects (1 MW+), including grid interconnection, permitting, and financing coordination.

How do I evaluate a solar installer?

Check portfolio size and project references, warranty offerings (12+ years workmanship is minimum), insurance coverage, local operational history (5+ years preferred), and price transparency (avoid vague quotes).