JFE Engineering has secured a contract from Kajima to manufacture and transport monopile foundations for the offshore wind project planned off Oga, Katagami, and Akita in Akita Prefecture, a move that the company says will place domestically produced monopiles into a Japanese commercial project for the first time.
The monopiles and transition pieces will be fabricated at JFE Engineering’s Kasaoka monopile facility in Okayama Prefecture. Company disclosures describe Kasaoka as Japan’s only domestic monopile production base.
Under the Kajima contract, JFE Engineering said it will produce and ship 21 monopiles and associated transition pieces between January 2026 and March 2027, using heavy steel plate developed for large-scale foundation applications. The company also states the plant is designed to stably mass-produce around 50 ultra-large monopiles per year, supported by dedicated storage capacity and a transport vessel.
The foundations are intended for the 315-MW Oga–Katagami–Akita offshore wind development led by Oga–Katagami–Akita Offshore Green Energy, which is planned as a 21-turbine project and targets the start of operations in June 2028, according to the developer’s project outline.
JFE Engineering said it is positioning its offshore wind offering to support projects from design through delivery, framing the Kasaoka output as part of efforts to strengthen Japan’s domestic supply chain and support national decarbonisation goals.
