What Sonnedix Japan does

Sonnedix Japan K.K. (ソネディックス・ジャパン株式会社) is a Tokyo-based developer, asset manager, and operator of utility-scale solar photovoltaic power plants in Japan, founded in July 2013 as the Japanese operating subsidiary of Sonnedix Group (Sonnedix Power Holdings Limited), a global independent power producer majority owned by a fund of institutional investors. The company focuses on ground-mounted (and selectively rooftop) mega-solar projects and operates across six Japanese regions — Tohoku, Kanto, Chubu-Hokuriku, Kansai, Chugoku, and Kyushu-Okinawa — with 25 operational solar PV plants and a controlled capacity of over 600 MW (approximately 495–518 MW of operational and pipeline capacity as of April 2024 across 19–23 projects). In November 2025, Sonnedix Japan announced its first Battery Energy Storage System (BESS) project — a 125 MWh Tesla Megapack installation co-located with a 39 MW PV plant in Oita Prefecture, with Toshiba Energy Systems & Solutions as EPC partner and Osaka Gas as market trading partner, targeting commercial operation in November 2026.

The company's core technology stack is centred on utility-scale ground-mounted solar PV using best-available modules and inverters (e.g., JA Solar 400 Wp modules, TMEIC 3.2 MW inverters at the Tanabu plant), supplemented by Tesla Megapack-based battery storage for the Oita BESS project. Asset management is performed in-house with real-time monitoring, performance optimisation, and O&M provider coordination across the portfolio; for the BESS project, market interaction and remote control are handled by Osaka Gas. The company has completed multiple end-to-end project executions (development through commercial operation) — including the 41.6 MW Sano plant (the seventh fully internally managed project) — and has integrated construction partners including Daiwa House Industry and Juwi Shizen Energy as EPC contractors.

Sonnedix Japan's revenue model is built on long-term fixed-price Power Purchase Agreements (PPAs) of 14.5 to 20 years with Japanese electric utilities (notably TEPCO Energy and Chubu Electric Power) and corporate energy buyers, with the first corporate PPA executed in 2021 for a 2.5 MW rooftop plant in western Japan. Revenue is complemented by asset management services across the Sonnedix Group portfolio and, from 2026 onward, by grid services and dispatchable energy supply from the Oita BESS project. The company is privately held, with 51–100 employees and project, portfolio, and BESS financing totalling over JPY 40 billion since 2021 from MUFG Bank, Iyo Bank, Bank of Fukuoka, Joyo Bank, and other regional banks under non-recourse structures.

Name

Sonnedix Japan

Legal name

Sonnedix Japan K.K.

Website

https://sonnedix.jp

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

51–100 employees

Short description

Sonnedix Japan is a Tokyo-based developer, asset manager, and operator of utility-scale solar photovoltaic power plants, managing over 600 MW across 25 plants in Japan as a subsidiary of Sonnedix Group. The company sells electricity under long-term PPAs to utilities and corporates and is now expanding into battery energy storage.

Ownership category

akta.pro rank

Headquarters

HQ city

Minato

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Supply Chain, Operations, Personnel, Technology or R&D, Others

Revenue model

1. Solar Power Generation and Sale: Sonnedix Japan generates revenue by operating utility-scale solar PV plants and selling electricity through long-term Power Purchase Agreements (PPAs). The company develops, acquires, and manages solar projects, selling the generated clean electricity to utilities (e.g., TEPCO Energy, Chubu Electric Power) and corporate customers under fixed-price, multi-year contracts typically ranging from 14.5 to 20 years.
2. Battery Energy Storage Services: Revenue from BESS projects by providing grid services including power market responsiveness, optimization of co-located solar generation, and dispatchable energy supply. Osaka Gas handles market trading and remote control of the BESS.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Sonnedix Japan develops, finances, constructs, and operates utility-scale (mega-solar) ground-mounted photovoltaic power plants across Japan, selling the generated electricity through long-term Power Purchase Agreements (PPAs) to utilities and corporate buyers. The company manages the full solar PV asset lifecycle from development through long-term asset management and is expanding into Battery Energy Storage Systems (BESS) to optimize solar generation and deliver dispatchable, market-responsive power supply.

Product overview

Sonnedix Japan is a developer, asset manager, and operator of utility-scale solar photovoltaic (mega-solar) power plants in Japan. The company's core offering is ground-mounted solar PV power plants, supplemented by Battery Energy Storage Systems (BESS) for hybrid renewable solutions. Operations span the full project lifecycle from site identification and permitting through financing, construction, and long-term asset management, with electricity sold under long-term Power Purchase Agreements (PPAs). The company manages a portfolio of approximately 500-600MW across Japan, including 25 operational solar PV plants and projects under development and construction.

Differentiator

Problem solved

Functional benefit

Products and services

• Solar Photovoltaic Power Plants

Quantifiable outcome

• 49,000 MWh/year clean energy produced by Sano plant, powering 11,000+ households and avoiding 24,000 metric tons CO2/year
• +4 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Eight partnerships are on record, tiered core, secondary and minor.

• Toshiba Energy Systems & Solutions CorporationcoreTechnology or Integration · 4 November 2025Engineering, Procurement, and Construction (EPC) partner for Sonnedix Japan's first BESS project: 125MWh battery storage system in Oita prefecture, co-located with a 39MW PV plant. Commercial operation targeted for November 2026.
• Tesla Japan GKcoreTechnology or Integration · 4 November 2025Supplier of Tesla Megapack battery units for the 125MWh BESS project in Oita prefecture, Sonnedix Japan's first battery energy storage project.
• Trina Solar Japan Energy (Trina Solar ISBU)coreStrategic or Co-development Partner · 12 April 2022Project acquisition partner for 16.4MW Motegi project (acquired December 2021) and 2.8MW portfolio (Yonago and Hamamatsu, acquired late 2021). Also source of 16.4MW pipeline project in Tochigi Prefecture.
• Thai Solar Energy Public Company LimitedsecondaryStrategic or Co-development Partner · 3 March 2022Seller of 18.11MW Hanamizuki solar PV project acquired in Q1 2022. Project is ground-mounted, located on abandoned farmland in Ishikawa prefecture, operating since January 2019 under Japan's FiT regime.
• Nagashima Ohno & TsunematsuminorOthers · 3 March 2022Legal advisor to Sonnedix for the acquisition of the 18.11MW Hanamizuki project from Thai Solar Energy and for the 16.4MW pipeline project acquisition from Trina Solar.
• Daiwa House Industry Co., Ltd.coreImplementation/ SI/ Consulting Partner · 23 February 2022Third EPC collaboration: handled civil construction and operations/maintenance for 40MW Sonnedix Soma plant. Also performed construction for 16.4MW Motegi project. Multiple project EPC partner.
• Juwi Shizen EnergycoreImplementation/ SI/ Consulting Partner · 31 January 2022Second EPC collaboration: handled complex civil construction for 26.5MW Sonnedix Tanabu plant (400Wp JA Solar modules, TMEIC 3.2MW inverters). Juwi Shizen Energy Operations performs O&M. Also handled 41.6MW Sano project.
• X-EliosecondaryStrategic or Co-development Partner · 15 October 2020Global solar developer from which Sonnedix acquired a 14MW solar PV plant in Yamaguchi prefecture in October 2020. Plant has been in commercial operation since June 2020.

Scale indicators9 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• ENGIE Japan: Japanese subsidiary of global utility ENGIE with renewable energy development and operation; comparable as a global IPP player with established Japan presence and renewable asset portfolio.
• Enel Green Power Japan: Japanese arm of Enel's global renewable IPP business, operating solar and wind in Japan; comparable as a globally backed utility-scale renewable IPP with established Japanese project portfolio.
• Iberdrola Renewables Japan: Japanese presence of global utility Iberdrola, participating in offshore wind and renewables in Japan; comparable as a large global utility IPP expanding into the Japanese market.
• TEPCO Renewable Power: Renewable energy arm of Tokyo Electric Power Company, one of Sonnedix Japan's largest off-takers; a major incumbent in Japanese renewables with overlapping solar, hydro, and wind assets.

Direct peers

• Looop Inc. Japanese solar developer and retailer with utility-scale PV plants and P2P energy initiatives; comparable to Sonnedix Japan in solar PV focus and Japanese market, with broader retail electricity overlap.
• SB Energy: SoftBank Group's Japanese renewable energy subsidiary developing utility-scale solar, wind, and battery storage; directly comparable in IPP model, Japanese geography, and BESS expansion strategy.
• Renova Inc. Tokyo-listed renewable energy developer and IPP with utility-scale solar, wind, and biomass assets in Japan; comparable to Sonnedix Japan in business model (PPA sales), geography, and project development lifecycle.
• Pacifico Energy: Japanese solar IPP with multi-gigawatt pipeline of utility-scale PV plants and PPA-based revenue model; directly comparable to Sonnedix Japan in target market, technology, and B2B utility off-taker model.
• Eurus Energy: Major Japanese renewable IPP (Toyota Tsusho and Tokyo Electric Power Company subsidiaries) operating wind and solar across Japan; directly comparable in technology mix and utility off-taker relationships.

Others

• Sonnedix Group: Global parent of Sonnedix Japan with 11.8GW operational capacity across 10 countries; provides capital, strategic direction, and global IPP know-how that underpin Sonnedix Japan's competitive positioning.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/sonnedixjapan

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sonnedix Japan