SUBSCRIBE
PROFILE

Sonnedix launches 125MWh storage project at its Oita solar plant

Sonnedix has started construction on a 125MWh battery storage system at its 30MWAC Oita solar site, with commercial operation planned for November 2026 and a JPY21.4bn ($142mn) financing secured.

Share:

Comprehensive energy news coverage, updated nonstop

Annual subscription

8.25$/month*

*billed annually at 99$/year for the first year then 149,00$/year ​

Unlimited access • Archives included • Professional invoice

SUBSCRIBE - 99$/year

OTHER ACCESS OPTIONS

Monthly subscription

Unlimited access • Archives included

5.2$/month*
then 14.90$ per month thereafter

FREE ACCOUNT

3 articles offered per month

FREE

*Prices are excluding VAT, which may vary depending on your location or professional status

Since 2021: 35,000 articles • 150+ analyses per week

Sonnedix Japan announced it broke ground in October on its first battery energy storage system, set to retrofit its 30MWAC/38.6MWDC solar power plant in Oita Prefecture. The project will add 125MWh of storage capacity to the site, signalling a significant evolution in the company’s Japanese asset portfolio.

An industrial partnership focused on technology integration

The battery energy storage system (BESS) will utilise Megapack units supplied by Tesla. Toshiba Energy Systems & Solutions will oversee engineering, procurement, and construction (EPC), while Osaka Gas will be responsible for market trading optimisation. The BESS is scheduled to enter commercial operation in November 2026.

The solar plant, owned by the special purpose entity Oita Solar LLC, has been operational since March 2020 under a feed-in-tariff (FIT) agreement of 40 JPY/kWh, valid until February 2040. As part of the retrofit, the facility will transition to the feed-in-premium (FIP) scheme, a mechanism offering market-based remuneration with additional premiums.

Structured financing and network constraint context

The project underwent a refinancing process aimed at optimising its capital structure. Sonnedix secured a non-recourse credit facility totalling JPY21.4bn ($142mn) from MUFG Bank. The funding is intended to support both the financial viability of the site and the capital requirements for battery system integration.

Among Sonnedix Japan’s 25 operational solar assets, the Oita plant is the only one located in the Kyushu transmission zone, known for its high curtailment risks. This marks the company’s second battery storage facility under construction globally, following an 18MW/72MWh hybrid generation-plus-storage project underway in Italy.

  • Popular on energynews.pro
Venture Global signs 20-year deal to supply LNG to the Balkans via Greece
Petrobras increases net profit in third quarter driven by production growth
Next Hydrogen raises up to CAD$30mn to support its commercial expansion
Gabon signs deepwater oil exploration deals with BP and ExxonMobil
Trump to auction 80 million offshore acres and plans Alaska lease sale
Tokyo Asset Solution deploys 13.2MWh of storage in Tokyo and Kumamoto
Tokyo Asset Solution invests in two storage projects, including a standalone site in the Japanese capital, marking its entry into the large-scale sector with national and international partners.
LEAG and Fluence launch Europe’s largest electricity storage project in Germany
LEAG Clean Power and Fluence Energy will build a 4 GWh battery energy storage system in Germany, marking a major step in the industrialisation of storage capacity at a European scale.
Plus Power secures $160mn for two battery storage projects in New England
Plus Power secured $160mn in tax equity investments from Morgan Stanley to fund two battery storage facilities in Massachusetts and Maine, the largest ever developed in New England.
Pylontech opens subsidiary in Australia to support energy storage investments
Chinese manufacturer Pylontech strengthens its international investment strategy by launching a local entity in Australia to accelerate the deployment of its energy storage solutions.
HiTHIUM partners with El-Mor to deploy 1.5GWh of long-duration storage in Israel
Chinese supplier HiTHIUM enters the Israeli market with a strategic agreement to deploy 1.5GWh of long-duration energy storage alongside El-Mor Renewable Energy.
GridStor activates 220 MW battery in Texas to stabilise the power grid
GridStor has inaugurated its first energy storage facility in Texas, a 220 MW battery, designed to support the ERCOT grid and respond to the rapid increase in industrial demand in the state.
Energy Vault signs $250mn deal for 1.8 GWh storage in the Balkans
Energy Vault and EU Green Energy have signed a framework agreement for 1.8 GWh of battery storage systems, worth up to $250mn, with an initial 200 MWh project launched in Albania.
EVE Energy and EVO Power sign strategic agreement for their expansion in Australia
EVE Energy will supply 2.2 GWh of storage systems to EVO Power over five years, supporting the large-scale deployment of front-of-meter solutions in the Australian market.
Gotion Launches First Electric Vehicle Battery Factory in Slovakia for Europe
Gotion inaugurates its Gigafactory in Slovakia, marking a significant advancement in electric vehicle battery production in Europe. This site, scheduled for 2027, strengthens the continent’s green industrial chain.
Erex and Samsung C&T Sign MoU to Develop Grid-Scale Energy Storage Projects in Japan
Erex and Samsung C&T announce a partnership to develop grid-scale energy storage projects in Japan. The two companies plan a 50:50 joint venture to deploy large-scale storage installations.
Sinopec and LG Chem Sign Agreement to Develop Sodium-Ion Battery Materials
Sinopec and LG Chem announce a strategic partnership to develop key materials for sodium-ion batteries. This collaboration aims to accelerate the commercialization of this technology in energy storage systems and low-speed electric vehicles.
Rondo Energy to deploy 100 MWh heat battery for HEINEKEN in Portugal
HEINEKEN, EDP, and Rondo Energy are deploying a 100 MWh industrial heat battery in Lisbon, providing renewable steam 24/7 using on-site solar power and the grid.
NextStar Energy starts energy storage battery production in Windsor this November
NextStar Energy begins lithium-ion battery production for energy storage systems (ESS) in its Windsor plant this month, expanding its operations beyond electric vehicle batteries.
Baltic Storage Platform secures €85.6mn for large-scale battery project in Estonia
Baltic Storage Platform secures a record €85.6mn ($90.6mn) to develop two battery energy storage sites in Estonia, marking the first such financing in the Baltics based solely on storage revenue streams.
Eos Energy secures 228 MWh strategic order from Frontier Power
Eos Energy and Frontier Power strengthen their collaboration with a major first order under a 5 GWh framework agreement to deploy long-duration storage systems across multiple energy markets.
Alternō launches sand battery technology in Japan with two thermal storage systems
Asia-based Alternō opens a subsidiary in Japan to industrialise its sand thermal batteries, targeting the agricultural and manufacturing sectors with two new renewable heat storage systems.
Fox ESS partners with Solar Juice to develop 1GWh of storage in Australia
Chinese manufacturer Fox ESS has entered into a partnership with Australian distributor Solar Juice to deploy up to 1GWh of battery capacity, targeting the fast-growing residential and commercial segments of the Australian market.
AOGC Approves Final Integration of Smackover Lithium’s SWA Project 2028
The Arkansas Oil and Gas Commission validated integration of the Reynolds Brine Unit after unitizing 20,854 acres and adopting a 2.5% lithium royalty. The project targets 22,500 tonnes per year of battery-grade lithium carbonate from 2028 via a 55:45 joint venture.
Star Charge signs $3.2 billion deal for 32 GWh storage projects in the US
Star Charge Americas has signed a major service agreement with Beneficial Holdings to deploy over 32 GWh of battery energy storage systems in the United States and Puerto Rico, with a total value exceeding $3.2 billion.
Baltic Storage Platform secures €85.6mn for dual battery project in Estonia
Joint venture Baltic Storage Platform has secured €85.6mn ($90.7mn) to build two energy storage systems in Estonia, forming one of continental Europe’s largest battery complexes.

All the latest energy news, all the time

Annual subscription

8.25$/month*

*billed annually at 99$/year for the first year then 149,00$/year ​

Unlimited access - Archives included - Pro invoice

START - 99$/year

Monthly subscription

Unlimited access • Archives included

5.2$/month*
then 14.90$ per month thereafter

*Prices shown are exclusive of VAT, which may vary according to your location or professional status.

Since 2021: 30,000 articles - +150 analyses/week.