CapexCue · Public evidence · Printed 11 Nov 2026

Hirohara Battery Energy Storage System (BESS); also referenced as “Hirohara BESS”.

Japan · Energy

In-depth research Release 1

Project scope

Battery energy storage system and associated infrastructure.

Reported status and procurement

Reported development: Successful delivery and installation of all major project equipment, including 32 Tesla Megapack 2 XL battery units.
Procurement availability: Unknown / not established

Reported financing

Project financing secured.

A source report alone does not establish current progress or an open buying window.

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.

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Project metadata

Country: Japan
Based on reviewed release evidence
Region: Asia
Category: Energy
Derived from released evidence
Physical assets: Battery Storage

Based on this release's supporting evidence. Unresolved fields remain unclassified; these labels do not establish current progress or a buying window.

Released facts and supporting evidence

Each fact retains its source, uncertainty and time context. If a publisher page moves or is unavailable, use the recorded quotation and observation date below.

Date

Source reported

The opening paragraph is datelined “Tokyo, Japan August 4, 2026”; the page date field displays “4/8/2026” (date format not specified).

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · The opening paragraph is datelined “Tokyo, Japan August …

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[1]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: db6981a8-1773-449f-9216-84f20ed6e3a1
Evidence reference: 2ec71066-4104-459c-9625-3b701c0b2dcf
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Project name

Source reported

Hirohara Battery Energy Storage System (BESS); also referenced as “Hirohara BESS”.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Hirohara Battery Energy Storage System (BESS); also referenced …

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[1]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: 1c0fe784-c8aa-4cbb-835b-2f73bf844440
Evidence reference: 2ec71066-4104-459c-9625-3b701c0b2dcf
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Owner

Source reported

Eku Energy Japan owns the battery storage asset.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Eku Energy Japan owns the battery storage asset.

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[3]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: 2483ed07-2948-4004-a6be-b18f2350f2ec
Evidence reference: e47f71ea-3835-47cd-964e-03064a51ef9c
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Scope

Source reported

Battery energy storage system and associated infrastructure.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Battery energy storage system and associated infrastructure.

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[1]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: 8f8d9273-aa6d-4bc0-9809-ba34a8b3f147
Evidence reference: 2ec71066-4104-459c-9625-3b701c0b2dcf
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Sector

Source reported

Battery energy storage system (BESS).

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Battery energy storage system (BESS).

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[1]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: f58ac438-917e-409b-af4e-08fffa3cc1d8
Evidence reference: 2ec71066-4104-459c-9625-3b701c0b2dcf
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Country

Source reported

Japan.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Japan.

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[1]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: 728d9a06-4417-4bc8-b659-311a43002de6
Evidence reference: 2ec71066-4104-459c-9625-3b701c0b2dcf
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Funding

Source reported

MUFG Bank is identified as the project financing provider; financing amount is not stated.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · MUFG Bank is identified as the project financing …

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[4]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: 15059034-4001-413d-88b9-549f642ff650
Evidence reference: 5edba457-309d-4762-bd20-1075ca8b6a7c
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Delivery

Reported as actual

Successful delivery and installation of all major project equipment, including 32 Tesla Megapack 2 XL battery units.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Successful delivery and installation of all major project …

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[1]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: dfeafb69-73cf-4b20-ae35-8f53a0a5574d
Evidence reference: 2ec71066-4104-459c-9625-3b701c0b2dcf
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Location

Source reported

Miyazaki City, Miyazaki Prefecture, Japan.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Miyazaki City, Miyazaki Prefecture, Japan.

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[1]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: 087f9514-98a4-4a17-bbea-5d45f6aa0921
Evidence reference: 2ec71066-4104-459c-9625-3b701c0b2dcf
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Operator

Planned

Tokyo Gas Co., Ltd. is to operate the facility over a 20-year term under the offtake arrangement.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Tokyo Gas Co., Ltd. is to operate the …

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[3]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: ec0c0744-92bd-4251-9ebc-7d8b35c12b8d
Evidence reference: e47f71ea-3835-47cd-964e-03064a51ef9c
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Next milestone

Planned

The project is to move into integration and commissioning, system testing, and regulatory inspections; commercial operations were reported as on track for January 2027.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · The project is to move into integration and …

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[2]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: dfeaeb25-32ef-4529-9e26-4ea952c69195
Evidence reference: 58312f5b-7f92-4bb5-a95c-e8f7a0e1db26
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Financing stage

Source reported

Project financing secured.

Attributed to www.ekuenergy.com.

Source: www.ekuenergy.com · publication date not recorded · observed 2026-10-17

Sources and evidence · www.ekuenergy.com

Source published: Not recordedObserved: 2026-10-17

www.ekuenergy.com
Attributed to www.ekuenergy.com

Technical record · Project financing secured.

Evidence location: /html/body/div[4]/div/div/div[2]/div[2]/div/div[1]/p[4]
Claim confidence: 0.90 on a 0–1 evidence-support scaleNot a probability of project success or procurement availability.
Claim reference: e327f016-5c8e-490d-b00b-c81cda84fd6f
Evidence reference: 5edba457-309d-4762-bd20-1075ca8b6a7c
Source revision: 6b4217b7-92dc-4d71-821d-aad82571970e
Content fingerprint: 39b8e732f09e8495cebae7b6bcc1836cbf1b03d60fa2cf70b510951d3bbb24f8
Source address: https://www.ekuenergy.com/en/news-and-blogs/news-hirohara-construction-milestone

Source report history

Prior and superseded states remain labelled. Dates below identify source publication when known, otherwise source observation. They are not assumed event dates; each fact retains its own time qualifications.

No material timeline events have been released.

Organizations and roles

Tokyo Gas Co., Ltd. is to operate the facility over a 20-year term under the offtake arrangement.

Source-reported operator Planned · Evidence

A documented role does not confirm who buys a particular equipment package.

Research coverage

Includes dedicated project research reviewed and incorporated into this dossier.

Latest research update published: 17 Oct 2026

Subsequent research updates: 0

Evidence and updates

Overview depth and evidence gaps

This overview presents supported project scope and source-reported information. Further research can add detail on:

Supplier-specific buying responsibility and equipment timing require separate assessment.

Oldest supporting observation: 2026-10-17 · newest supporting observation: 2026-10-17. Review time does not freshen source evidence.

Source, observation and release dates · structured source date unavailable

Source report dates: Structured source date unavailable · 1 source revision without a structured report date
Source captured: 17 Oct 2026
Dossier released: 17 Oct 2026

Source event/report wording remains with each fact. Capture and release dates do not establish a new project event.

How to read evidence limits

“Not observed” means no supporting evidence in this release, not that the event did not happen.

Dossier updates

These are CapexCue's recorded public dossier releases, not project event dates. Up to 20 releases are listed.

First recorded dossier release. This does not establish that the project is new or unchanged.

Release 1 · dossier released 17 Oct 2026, 16:46 UTC

Release and method

Oldest supporting observation: 2026-10-17
Dossier released: 17 Oct 2026, 16:46 UTC
Method: Versioned source, claim and public-policy decisions

Publication policy

accepted-destination-v1 · dossier-v1

Stable project reference: 491ca16f-0b3f-41da-8946-caf183ca987f

Read methodology Suggest a correction

Share the current dossier link, or cite this release.

Link and citation for manual copying

Current dossier link

Citation for this releaseCapexCue — 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/.

The link opens the current dossier. The citation identifies release 1; it is not a permanent revision link.

Data and exports

These files include the released public facts, qualifications, source references and CapexCue citation.

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