Hitachi, Brookfield, Hartree and Tokyo Gas Sign MoU for Integrated Green Data Center Model in Japan
DataNews Editorial Team
Hitachi, Brookfield Japan, Hartree Partners Singapore and Tokyo Gas have signed a memorandum of understanding to develop an integrated-energy model for green data centers in Japan. Initial project planning is expected to focus on the Kanto and Kyushu regions, covering due diligence, equipment configuration, energy infrastructure and commercial structures.
- The MoU combines data center development with integrated power-infrastructure planning in Japan.
- Initial planning work is proposed for Kanto and Kyushu, rather than announced operational facilities.
- The energy model will assess on-site generation, storage and grid supply, with cooling and power-distribution redundancy also under consideration.
- Brookfield's disclosed global data center and generation figures are background credentials, not Japanese project commitments.
- No project capacity, CAPEX, timeline, specific sites or customers have been disclosed.
The four companies announced on 19 October that they had signed the memorandum on 30 September. Tokyo Gas joins a collaboration between Hitachi, Brookfield and Hartree that was initially announced in July 2025.
The partners intend to establish a baseline concept for data centers with integrated power infrastructure and to develop a standardized model that can be deployed flexibly at different scales. The first proposed projects are in Kanto and Kyushu, where planning is to cover due diligence, equipment configuration, energy infrastructure and the business model.
The proposed energy architecture will examine on-site generation as the base supply source, combined with energy-storage systems and grid electricity. The parties also plan to consider redundancy across the facility infrastructure, including cooling and power distribution. This approach could support data center development in locations where grid-capacity availability is a material constraint, by treating generation, storage, interconnection and resilience as integrated design variables rather than separate workstreams.
Brookfield's cited global experience provides context for the collaboration but does not represent capacity committed to the Japanese projects. The company has operated more than 150 data centers globally, with approximately 2 GW of operational IT capacity, and owns and operates approximately 47 GW of renewable generation assets worldwide. It also supplies approximately 8 GW per year of new generation capacity. No capacity, CAPEX, delivery schedule, specific sites or customer commitments have been disclosed for the proposed Kanto and Kyushu developments.
The agreement remains an MoU and describes a development and model-design process rather than the start of construction or the commissioning of data center capacity. Final technical choices—including the configuration of on-site generation, the role of storage and the extent of grid use—have not been defined.
The initiative brings data center development and power-system design into a single planning model, with on-site generation considered as the primary supply source alongside energy storage and the grid. If the proposed standardized model is implemented, it could broaden siting options and reduce exposure to constraints on available grid capacity, although project-scale commercial and technical parameters have not been disclosed.
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This article was prepared by the DataNews editorial team based on the sources listed above.