# Hirohara Battery Energy Storage System (BESS); also referenced as “Hirohara BESS”. Publisher: CapexCue Canonical dossier: Dossier reference: release 1 (c7c1f979-7305-48eb-9cc8-32010c82d6af) Released project intelligence Oldest supporting observation: 2026-10-17T16:41:44.967561+00:00 Dossier released: 2026-10-17T16:46:09.137266+00:00 Source report dates and capture dates are listed per fact below; neither establishes an event date. ## Project summary Hirohara BESS is a battery energy storage system with associated infrastructure in Miyazaki City, Miyazaki Prefecture, Japan. Eku Energy Japan reports that all major project equipment has been delivered and installed, including 32 Tesla Megapack 2 XL battery units. The next reported construction phase includes integration and commissioning, system testing, and regulatory inspections; commercial operations were reported as on track for January 2027. Eku Energy Japan is identified as the asset owner, and Tokyo Gas Co., Ltd. is to operate the facility for 20 years under the offtake arrangement. The release reports project financing from MUFG Bank but gives no financing amount. The opening dateline says August 4, 2026, while the page date field displays “4/8/2026” without specifying its format. ## Evidence limits and unknowns - Rated power and energy capacity are not stated in the project description. - The supplied release does not identify procurement status or an open supplier package. - The financing amount is not stated. - The format of the page date field “4/8/2026” is unspecified. Current purchasing availability: unknown. Source-dated plans do not establish current progress or available supplier packages. ## Project metadata Country: Japan Region: Asia Physical assets: Battery Storage Derived from the exact released evidence; unresolved fields remain unclassified. ## Project category Energy Derived from the reviewed name statement; delivery stage remains unclassified. Hirohara Battery Energy Storage System (BESS); also referenced as “Hirohara BESS”. Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 Project overview Oldest decisive evidence: 2026-10-17T16:41:44.967561+00:00 Newest evidence: 2026-10-17T16:41:44.967561+00:00 Knowledge reviewed: 2026-10-17T16:44:31.372412+00:00 Publication reviewed: 2026-10-17T16:45:42.299015+00:00 ## Date The opening paragraph is datelined “Tokyo, Japan August 4, 2026”; the page date field displays “4/8/2026” (date format not specified). Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Name Hirohara Battery Energy Storage System (BESS); also referenced as “Hirohara BESS”. Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Owner Eku Energy Japan owns the battery storage asset. Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Scope Battery energy storage system and associated infrastructure. Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Sector Battery energy storage system (BESS). Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Country Japan. Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Finance MUFG Bank is identified as the project financing provider; financing amount is not stated. Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Delivery Successful delivery and installation of all major project equipment, including 32 Tesla Megapack 2 XL battery units. Status: actual Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Location Miyazaki City, Miyazaki Prefecture, Japan. Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Operator Tokyo Gas Co., Ltd. is to operate the facility over a 20-year term under the offtake arrangement. Status: planned Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Next Milestone The project is to move into integration and commissioning, system testing, and regulatory inspections; commercial operations were reported as on track for January 2027. Status: planned Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Financing Stage Project financing secured. Status: reported Attribution: www.ekuenergy.com Source: www.ekuenergy.com — https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone | published unknown | observed 2026-10-17T16:41:44.967561+00:00 ## Cite this dossier CapexCue — Hirohara Battery Energy Storage System (BESS); also referenced as “Hirohara BESS”. — dossier released 2026-10-17T16:46:09.137266+00:00, release 1 (c7c1f979-7305-48eb-9cc8-32010c82d6af) — https://capexcue.com/projects/hirohara-battery-energy-storage-system-bess-also-referenced-as-hirohara-bess-8b398003-5f2/. For current information and later dossier updates, visit . This file records the release identified above; the current dossier may change.