Updated September 25, 2025 – The Formosa 4 Offshore Wind Farm in Taiwan has reached a key milestone with CDWE (a DEME Taiwanese JV) securing a contract from Synera Renewable Energy (SRE) for the transport and installation of 35 jacket foundations, an offshore substation, and scour protection works. The 495 MW project will begin offshore foundation installation in early 2027. Additionally, locally built heavy-lift vessel, Green Jade, will be used for the installation work. This contract also marks CDWE’s second award under Taiwan’s Phase 3-1 zonal development and its first partnership with SRE.
CDWE is also spearheading the development of the Hai Long Offshore Wind Project in the Taiwan Strait. As of August 2025, the project had received 21 jacket foundations by Century Wind Power. The Taiwan Strait is also home to the Greater Changhua 2b and 4 offshore wind farms currently under development by Ørsted. The Greater Changhua series forms the largest wind farm in the Asia-Pacific region when combined.
Formosa 4 Offshore Wind Project Factsheet
Developer: Synera Renewable Energy (SRE)
Location: 18-20 km off the coast of Miaoli County, Taiwan
Capacity: 495 MW
Water depths: 57-64 meters
Site Area: 58 sq km offshore
Contracts Awarded:
- 35 jacket foundations, one offshore substation, scour protection works contract to DEME/CDWE
- Turbine supply contract with Siemens Gamesa for 35 14 MW turbines
- Turbine installation contract with Cadeler
- Inter-array cable installation by Seaway7 for 35 cables
- Operations & maintenance (O&M): 15-year service operations vessel contract awarded to DFO
Formosa 4 Offshore Wind Project Timeline
2022: Formosa 4 offshore wind farm is awarded 495 MW in Taiwan’s first Phase 3 wind auction
Late 2024: The project obtains establishment permit
Aug 22, 2025: Cadeler signs turbine installation contract with SRE for 35 turbines
Sept 25, 2025: DEME/CDWE awarded contract for foundations, offshore substation, and scour protection
Early 2027: Offshore foundation installation expected
2028: Turbine installation by Cadeler to begin in March 2028 for 150 days
2028: Seaway7 also expected to begin inter-array cable installation in 2028
Siemens Gamesa Wins Formosa 4 Offshore Wind Project Turbine Supply Contract
Reported September 16, 2025 – Synera Renewable Energy (SRE) selects Siemens Gamesa for the third time to supply 35 state-of-the-art 14 MW turbines for Taiwan’s Formosa 4 offshore wind farm. The 495 MW project, planned off the coast of Miaoli County, secured capacity in the first auction round of Phase 3 Zonal Development in late 2022. It then received its establishment permit in November 2024. This, according to SRE, made it the first of the round-one winners to reach this milestone.
Once operational, Formosa 4 will produce enough renewable energy to power around 500,000 households annually. It will be SRE’s third offshore wind farm in Taiwan since entering the sector in 2012. Additionally, this turbine contract marks the third collaboration between SRE and Siemens.
The turbines will be assembled at Siemens Gamesa’s nacelle factory in Taichung. Local manufacturer Century Wind Power will supply the foundations. Cadeler will handle turbine transportation and installation as agreed in a August 2025 contract. Seaway7 will install the inter-array cables, with offshore construction slated to begin in 2028.
Demand for renewable energy has also risen significantly especially with the soaring demand from power hungry data centers. This is as seen with Google’s April 2025 announcement of its first offshore wind power purchase agreement (PPA) in the Asia Pacific region.
Substation and Jacket Structure Design for the Formosa 4 Offshore Wind Project
Reported March 18, 2022 – Swancor Renewable Energy’s Formosa 4 offshore wind project in Miaoli County, Taiwan, commissions Semco Maritime to handle conceptual design study. Also looked at are the jacket foundations, and a 500 MW offshore substation. The Danish firm will also in collaboration with PTSC M&C (Vietnam), ISC Consulting Engineers (Denmark), and WSP (Taiwan).
Under the deal, ISC Consulting Engineers are in charge of the conceptual design and layout of the offshore substation and jacket structure. PTSC M&C handles assessment of construction and fabrication for the offshore substation and jacket.
Additionally, WSP will serve as the project’s auxiliary arm. It will also assist the local supplier system ensure compliance with local content criteria. This will be done in conjunction with Taiwanese authorities.
According to Semco Maritime, the conceptual design project documentation will be generated partially in Denmark and partly in Taiwan. This implements the previously disclosed localization requirements for the third bidding round in Taiwan.
The Danish firm made the following comment after the contract award:
“We will aim to include as much locally manufactured equipment as possible in the Conceptual Design project while adhering to required standards for the offshore substation and balance of plant.”
Taiwan’s EPA Review for the Formosa 4 Offshore Wind Project
Swancor Renewable Energy forwarded an Environmental Impact Assessment (EIA) for Formosa 4 project in 2020. Taiwan’s Environmental Protection Agency (EPA) proceeded with its evaluation.
Formosa 4 offshore wind project is also one of two schemes the developer prepared for in Round 3 bidding. It was also one of nine projects currently under EPA review. The Round 3 offshore wind tenders in Taiwan procure development for wind farms that expect to start operations between 2026 and 2035. The first phase focuses on projects to be operational in 2026/2027.
Swancor Renewable Energy also announced in September 2020 of its aim to create a 4.4 GW portfolio of new offshore wind projects off the coast of Miaoli County. This was after the developer was involved in the development of Formosa 1 and Formosa 2. Formosa 1 is also Taiwan’s first commercial offshore wind project.
The projects were branded Formosa 4-1, Formosa 4-2, and Formosa 4-3. The bottom-fixed, Formosa 4-3, was renamed Formosa 4. Additionally, the floating project, Formosa 4-2, was renamed Formosa 5. This conformed with the bidding method outlined in the Ministry of Economic Affairs’ Round 3 auction guidelines.
Swancor officially submitted the Environmental Impact Assessment report for the 4.4 GW development to Taiwan’s Bureau of Energy in December 2020, claiming to be the first to do so ahead of other contenders for the Third Zonal Development of Offshore Wind.
