| 21991 | On-grid | Nemy, Inc. | 2 Chome-24-3 Ohashi, Meguro-ku, Tokyo-to 153-0044 | +81 3 54303103 | www.nemy.co.jp | | |
| 21992 | On-grid | Nice CJ Co., Ltd. | 1-45 Shirahama Kita-cho Naka-ku, Hiroshima-shi, 730-0001 | +81 82 2235675 | www.nicecj.com | | |
| 21993 | On-grid | Nichieco Co., Ltd. | 908-3 Ofuku, Minami-ku, Okayama-shi, Okayama-ken 701-0204 | +81 86 2398666 | nichieco.jp | | |
| 21994 | On-grid | Nihon Denka Center Co., Ltd. | Pure Life Building 2F, 11-8 Tamachi, Kokurakita -ku, Kitakyushu-shi, Fukuoka | +81 93 5835371 | www.plg-life.co.jp | | |
| 21995 | On-grid | Nihon Lohas Corporation | 2-42-3 Ikebukuro, Toshima-ku, Tokyo 171-0014 | +81 3 68640683 | lohas.jpn.com | | |
| 21996 | On-grid | Nikkoh Heating Co., Ltd. | 4 Chome-1-38 Yurigahara, Kita-ku, Sapporo-shi, Hokkaido 002-8081 | +81 11 7048181 | www.nikkoh-heating.jp/solar/ | Solar Frontier K.K. | |
| 21997 | On-grid | Nishitokyo Jutaku Reform Corporation | 2 Chome-10-22 Takamatsucho, Tachikawa-shi, Tokyo-to | +81 120 283427 | www.ntjrco.com | | |
| 21998 | On-grid | Nittsu-gas Corporation | 245 MinamioIizuka-shi, Fukuoka-ken | +81 948 243900 | nittsu-gas.com | | |
| 21999 | On-grid | Noa Go | 2 Chome-3-4 Hesakakazuko Higashi-ku, Hiroshima-shi, Hiroshima-ken | +81 82 5735731 | www.noa-go.com | | |
| 22000 | On-grid | Nomura Kensetsu Kougyou Co., Ltd. | 1 Chome Hirosawacho, Kiryu-shi, Gunma-ken 376-0013 | +81 277 528282 | www.nomura-kensetsu.com | | |
| 22001 | On-grid | North Energy Inc. | 4th floor, Ito Building, 4-1, Kita 4- jo Nishi, Chuo-ku, Sapporo-shi, Hokkaido 060-0004 | +81 11 7884966 | https://www.northenergy.jp | | |
| 22002 | On-grid | Nihon Sougou Denki Co., Ltd. | 13 Chome−4−161, Odorinishi, Chuo-ku, Sapporo-shi, Hokkaido | +81 11 2151526 | www.nissouden.com | | |
| 22003 | On-grid | Okada Denco Co., Ltd. | 6 Chome-6-10 Nishifukubara, Yonago-shi, Tottori-ken | +81 859 338470 | okakou.sdgr.co.jp | | |
| 22004 | On-grid | Okaishi Construction Co., Ltd | 293-1, Okayama-shi, Okayama-ken | +81 86 2982400 | www.kousai-k.co.jp | | |
| 22005 | On-grid | OrbitOne Incorporated | Nishinanakubo-46-4 Futsukamachi, Shiwa-cho, Shiwa-gun, Iwate-ken | +81 19 6138922 | orbitone.co.jp | | |
| 22006 | On-grid | Orec Co., Ltd. | 479-1, Nishiyoshida, Tsuyama City, Okayama Prefecture, 708-0856 | +81 86 8263121 | www.orec.jp | | |
| 22007 | On-grid | Orient House Co., Ltd. | 42 Nishinokyo Higashinakaaicho Nakagyo-ku, Kyoto-shi, Kyoto-fu 604-8437 | +81 75 8211006 | orient-house-solar.webnode.jp | | |
| 22008 | On-grid | Oshiki Electric Equipment Ltd. | 4306-4 Takai, Takayama-mura, Kamitakai-gun, Nagano-ken 382-0800 | +81 26 2482439 | www.oshiki.jp | | Sharp Energy Solutions Europe, Panasonic Corporation (Sanyo) |
| 22009 | On-grid | Pablo Electric Co., Ltd. | 2333-1 Shimohemi, Koga, Ibaraki 306-0235 | +81 28 0235550 | pablo-electric.com | | |
| 22010 | On-grid | Person Japan Co., Ltd. | 231-1 Shimojima, Suruga-ku, Shizuoka-shi, Shizuoka-ken 422-8037 | +81 54 2019085 | www.person-japan.jp | | |
| 22011 | On-grid | Power Line Co., Ltd. | 926-1 Tachibana Omuta-shi, Fukuoka-ken 837-0911 | +81 944 580368 | www.p-line.co.jp | | |
| 22012 | On-grid | Protex Co., Ltd. | 375-1 Toyoda, Suwa-shi, Nagano-ken 392-0016 | +81 266 750885 | www.solar-protex.com | | |
| 22013 | On-grid | Rikken, Inc. | 349-2, Amidaijimachi, Isesaki-shi, Gunma-ken, 372-0821 | +81 270 213619 | www.rikken-clean.jp | | |
| 22014 | On-grid | Roid Residential Settings Co., Ltd. | 2-24-6 Moridai, Atsugi-shi, Kanagawa 243-0037 | +81 120 611056 | roid-utility.jp | | |
| 22015 | On-grid | RST Co., Ltd | 30-4 Azumachō, Aoi-ku, Shizuoka, 420-0836 | +81 54 2667212 | rst-s.com | | |
| 22016 | On-grid | RT Industry Co., Ltd. | 1 Chome-4-14 Nonomiya, Ibaraki-shi, Osaka-fu 567-0847 | +81 72 6365135 | www.rtkogyo.co.jp | | Yingli Green Energy Holding Co., Ltd., Kyocera Corporation, Solar Frontier K.K., Canadian Solar Inc., Mitsubishi Electric Corporation, Sharp Energy Solutions Europe, Panasonic Corporation (Sanyo), Hyundai Energy Solutions, Toshiba Corporation, Choshu Indu |
| 22017 | On-grid | Ryuden Co., Ltd. | 2-85-1 Hichie-cho, Gifu-city, Gifu 501-6133 | +81 58 2790481 | www.ryuden.co.jp | | Canadian Solar Inc., Mitsubishi Electric Corporation, Sharp Energy Solutions Europe, Panasonic Corporation (Sanyo), Toshiba Corporation, Choshu Industry Co., Ltd. |
| 22018 | On-grid | Sakoda Co., Ltd. | 5 Chome-62-3 Suigencho, Toyota-shi, Aichi-ken 471-0822 | +81 565 776941 | sakoda-shin.co.jp | | |
| 22019 | On-grid | Sakuma Co., Ltd. | 2 Iwafunemikkaichi, Murakami-shi, Niigata-ken | +81 254 567634 | www.iwafune.ne.jp/~sakuma/ | Mitsubishi Electric Corporation, Panasonic Corporation (Sanyo) | |
| 22020 | On-grid | Sandoria West, Inc. | 4-12, Banzaichou, Kita-ku, Osaka-shi, Osaka | +81 6 63127577 | www.sanwest.co.jp | | |