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Penta-Ocean Construction Co., Ltd.
Takuzo Shimizu, President, CEO and Representative Director

Construction of New Multipurpose Self-Elevating Platform (SEP) Equipped with Large Crane (1,600t lifting capacity)

Tokyo, Japan - November 20, 2019- The three companies, Penta-Ocean Construction Co., Ltd., Kajima Corporation (President, Mr. Yoshikazu Oshimi), and Yorigami Maritime Construction Co., Ltd. (President, Mr. Masafumi Yorigami), have agreed to jointly construct a multipurpose self-elevating platform (SEP) equipped with a 1,600t lifting capacity crane for construction of bottom-fixed foundations and wind turbines for 10-12 MW class wind power generation facilities. The SEP ship holding company will be established as a subsidiary of Penta-Ocean Construction Co., Ltd. and it will be operated jointly by the three companies.


In light of the enactment of relevant regulations*1 which promote offshore wind power generation in the general sea areas in addition to the port and harbor areas, the development of offshore wind power generation projects have gained considerable momentum across the nation.
The new SEP will be equipped with a 1,600t hoisting, fully revolving crane to cope with the increasing size of the offshore wind turbine and its basic foundation, enabling the efficient construction of 10-12 MW class offshore wind power generation facilities. The basic design will be undertaken by a specialist company, GustoMSC (Netherlands), which delivers design solutions for about 70% of all SEPs around the world. PaxOcean Engineering (Singapore), which is part of Kuok Family, the largest international conglomerate group in Malaysia, will be responsible for the overall building of the SEP. The vessel will be equipped with a main crane built by Huisman (Netherlands), a leading manufacturer of offshore cranes.
The SEP is scheduled to be completed and delivered in September 2022 and operational in March 2023, with an investment of approximately JPY 18.5 billion.


Penta-Ocean Construction Co., Ltd. and Kajima Corporation had been in charge of the design and construction of demonstration units in Hibiki district of Kitakyushu Port in Fukuoka Prefecture and off the Coast of Choshi in Chiba Prefecture, respectively. And they both have solid track record and technological expertise related to planning, designing and construction of bottom-fixed offshore wind power generation facilities. Yorigami Maritime Construction Co., Ltd. has extensive experience in marine civil engineering works including offshore crane operations.
In particular, Penta-Ocean Construction Co., Ltd. owns the first Japanese multipurpose SEP, “CP-8001”, equipped with an 800t lifting capacity crane and has been accumulating shipbuilding prowess on the construction of SEP, as well as significant operational experiences. We will draw on our expertise to ensure the successful construction of our second SEP.
We believe that the SEP will make a significant contribution to further encouragement of broader use and expansion of Japan’s offshore wind power generation through realization of “safe and highly-efficient construction” and “reasonable construction costs”.


*1Act of Promoting Utilization of Sea Areas in the Development of Power Generation Facilities Using Maritime Renewable Energy Resources.


Concept Image

Conceptual Image of new SEP

Distinctive Features

  • By jacking up the hull above seawater, the vessel ensures safe, efficient and highly precise crane operation even in the sea areas with severe meteorological and hydrographic conditions. Operational in deep waters (up to 50m).
  • The fully revolving crane with a 1,600t lifting capacity enables installation of 10-12MW wind turbines and various foundations including monopiles, jackets, etc.
  • Thanks to the large deck space and sufficient jack-up capacity, the SEP can carry multiple 10-12 MW class wind turbines for efficient installation works.
  • The equipped Dynamic Positioning System (DPS) keeps the hull position with high precision, and reduces positioning time required during jacking up of SEP.
Construction Schedule

  • January 2020         Establishment of a Ship Holding Company
    Execution of Construction Agreement with the Shipbuilding Company
  • September 2022    Completion and Delivery


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