First IOWN Rollout on the Hokkaido Ishikari to Tokyo Otemachi, Tokyo Route

Sales launch of dedicated water-cooled cooling rooms for GPU servers

                                                                                                            Press Release

                                                                                                         September 25, 2025

                                                                     Ishikari Renewable Energy Data Center 1 LLC

 The inaugural Ishikari Renewable Energy Data Center will implement NTT EAST’s All-Photonics Network (APN) as part of the IOWN framework, connecting Ishikari in Hokkaido to Otemachi in Tokyo. The first Ishikari Renewable Energy Data Center will leverage the APN - featuring high-speed, high-capacity, low-latency, and energy efficiency - for connectivity to Otemachi. This new network resolves longstanding challenges in distance and latency between Tokyo and Hokkaido, creating and delivering an environment where Otemachi—the heart of Japan's network—and Ishikari in Hokkaido can be used as seamlessly as neighboring data centers.

  APN completion of construction is scheduled for August 2026.

 In conjunction with the IOWN rollout, sales have commenced for one 2.4 MW section of the inaugural Ishikari Renewable Energy Data Center No. 1, repurposed as a dedicated room for GPU servers to address the surging AI demand. This section enables the adoption of a water-cooling system, allowing for flexible equipment design tailored to the user's specifications. As Hokkaido's inaugural dedicated GPU data hall, it will be provided to data center operators, corporate users, and AI companies planning to introduce water-cooling systems and GPU server installations in the Tokyo metropolitan or Kansai regions moving forward.

March 2026 – Expected conceptual rendering, Ishikari Renewable Energy Data Center 1 LLC

■    Ishikari Renewable Energy Data Center 1 LLC Overview     

Scheduled to open in April 2026, following the decision to grant subsidies from the Communications and Information Network Association of Japan (CIAJ), a general incorporated association, based on the Ministry of Internal Affairs and Communications' "FY2021 Supplementary Budget Digital Infrastructure Development Fund Subsidy Program." Led by Tokyu Fudosan Co., Ltd., Flower Communications Co., Ltd., and Agility Asset Advisors Co., Ltd., with design supervision by Ken Asai Architectural Research Institute Co., Ltd., and construction by local general contractor Nakayama Construction Co., Ltd., this is a renewable energy data center in Ishikari, Hokkaido, that actively incorporates on-site power purchase agreements (PPAs) to promote local production and consumption of renewable energy.

Gross floor area: 11,093 m² (planned); Power receiving capacity: 15 MW; Number of racks: 1,140 racks

■    For inquiries regarding this release

    Flower Communications Inc.

    Contact: Naotaka Yanagawa

    TEL: [phone]

    E-mail: [e-mail]