Formosa 4 is an offshore wind farm being developed by Synera Renewable Energy (SRE) off the coast of Taiwan.
With a planned installed capacity of up to 1.1GW, it is regarded as the first offshore wind project in Taiwan to be executed entirely by a domestic development team since the sector became commercially established in the country.
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Offshore installation is scheduled to start in March 2028 and commercial operations are targeted for the second quarter of 2029.
Once commissioned, the project is expected to generate around two billion kilowatt-hours of renewable electricity each year, enough to supply approximately 500,000 households.
Formosa 4 project location
The project site spans roughly 58km² and is located around 18km off Tongxiao Township in Miaoli County on Taiwan’s west coast, in water depths of approximately 57–64m.
The wind farm is situated further offshore than the nearby Formosa 1 and Formosa 2 wind farms.
Development background
SRE announced Formosa 4 in September 2020, building on its involvement in Formosa 1, Taiwan’s first commercial-scale offshore wind farm, and Formosa 2.
In January 2023, the Ministry of Economic Affairs awarded the project 495MW in the first auction round under the Phase 3 Zonal Development for offshore wind. The company subsequently submitted the project’s administrative contract to the Bureau of Energy in June 2023.
The Ministry of Environment granted regulatory approval for the project’s final environmental assessment and environmental deviation assessment in August 2023 and July 2024, respectively.
In November 2024, the project secured an establishment permit from the Energy Administration, the first such permit among the winners of the initial Phase 3 Zonal Development auction round.
Formosa 4 offshore wind farm details
Formosa 4 will include 35 wind turbine generators with a rating of around 14.142MW each.
The electrical system will operate across 66 kilovolts (kV), 161kV and 230kV, with eight 66kV inter-array cable strings linking the turbines.
Electricity will be exported via a 500MW offshore substation and two 230kV export cable strings following the same route for around 27km to the landfall at Fangli village in Yuanli Township.
A 500MW onshore substation and an onshore 161kV cable of roughly 4km will connect to the Fangli grid connection point operated by Taipower in Yuanli Township, Miaoli County.
Power purchase agreements
SRE signed a long-term corporate power purchase agreement (CPPA) with Taiwan Smart Electricity & Energy (TSEE) in December 2025.
Under the arrangement, a fixed portion of Formosa 4’s output will be allocated to TSEE once the project is grid-connected, enabling TSEE to sell green power through its platform to companies pursuing decarbonisation.
SRE also confirmed in the same month that the project’s 495MW contracted output had been fully subscribed through two additional CPPAs.
Contractors involved
In July 2025, Taiwan’s Century Wind Power was contracted to manufacture and supply 35 jacket foundations, as well as coordinate the foundations’ scope in support of the grid-connection timetable.
Siemens Gamesa was chosen to supply 35 units of its 14MW wind turbines, to be produced at its nacelle facility in Taichung.
Cadeler signed a firm agreement to transport and install the turbines using one of its M-class installation vessels.
In September 2025, the CSBC-DEME joint venture CDWE was awarded the transport and installation package for the foundations and offshore substation, alongside scour protection, with the Green Jade heavy-lift vessel to serve as the primary construction vessel.
In the same month, a consortium comprising Denmark’s Semco Maritime and Vietnam’s PTSC Mechanical & Construction won the engineering, procurement and construction contract to deliver the offshore substation for the wind farm.
In October 2025, Jan De Nul was contracted for the transport and installation of export cables for the project. The company will utilise its cable-laying vessel Willem de Vlamingh.
Additionally, Seaway7 was awarded the contract for the transportation and installation of 57 inter-array cables for the Formosa 4 offshore wind farm.
