The latest renewable energy news includes announcements from SOWITEC, TEPCO Renewable Power, Certain Energy, Choshi Offshore Wind Farm, and others.
Insolvent SOWITEC Puts 32 GW Global Wind and Solar Development Portfolio Up for Sale
SOWITEC’s administrators are seeking buyers for a renewable-energy development portfolio totaling around 32 GW after the German developer filed for insolvency in July 2026. SOWITEC has operated for more than 30 years and is active across 13 countries, developing wind and solar projects from site identification through planning and permitting. Insolvency applications were filed for SOWITEC group GmbH as well as SOWITEC international, operation and projekt subsidiaries. The scale of the 32 GW portfolio makes the sales process potentially significant for renewable developers and infrastructure investors seeking projects at different development stages. Any transaction could redistribute a substantial international pipeline across wind and solar markets rather than simply involve SOWITEC’s corporate operating assets.
TEPCO Files Plans for Up to 420 MW Choshi Offshore Wind Farm With 27 Turbines
TEPCO Renewable Power has started the environmental assessment process for a new offshore wind development of up to 420 MW off Choshi City in Japan’s Chiba Prefecture. Initial plans envisage 21–27 turbines rated between 15 MW and 20 MW each across an approximately 40-square-kilometre area. The site was previously awarded to a Mitsubishi-led consortium in Japan’s first offshore wind auction, but Mitsubishi withdrew from the project in August 2025 after construction costs increased sharply. Mitsubishi’s original Choshi scheme was around 403 MW. TEPCO’s filing signals interest in the expected re-tender of the offshore zone and could revive a strategically important Japanese wind development using substantially larger turbines than contemplated in earlier designs.
Finland Utility-Scale Solar Pipeline Surges Above 26 GW Across 300 Projects
Finland now has more than 26 GW of utility-scale solar capacity under development across approximately 300 projects, according to an updated portfolio compiled by Renewables Finland. Of that pipeline, 77 projects totaling around 4.6 GW have progressed to more advanced stages. The numbers demonstrate how quickly Finland is moving beyond its traditional wind-dominated renewable market into large-scale photovoltaic development. The 26 GW pipeline is many times larger than the country’s current utility solar fleet, meaning only a portion needs to reach construction to materially alter Finland’s generation mix. Expansion at this scale will also increase requirements for transmission, battery storage and flexible demand as Finland seeks to combine growing solar output with its already substantial onshore wind resource and electricity-intensive industrial investments.
Certain Energy Raises £10 Million to Build MWh-Scale Manganese Flow Battery in India UK long-duration storage developer Certain Energy, formerly RFC Power, has raised £10 million in Series A funding to commercialise its manganese flow battery technology. The British Business Bank led the round with a £3.5 million investment, alongside Centrica, Ceres Power and Temasek Trust’s Catalytic Capital for Climate and Health. Certain Energy plans to develop a grid-connected MWh-scale system in India, expand its UK R&D facility and establish a supply chain for commercial projects. The company says manganese-based storage can provide durations ranging from hours to days and potentially reduce storage costs to around one-tenth of current levels. Ceres is investing £1 million in cash plus £1.5 million of engineering services and will retain roughly 37 percent ownership.
