Battery Storage in Japan: 2026 Grid Connection Updates

Changes to Japan’s grid-access procedures and network operators’ supply conditions took effect on 1 October 2026, introducing a deadline for covered projects to submit evidence of rights to use their sites. Developers and investors in battery energy storage systems (BESS) should review their land arrangements and grid connection timetables.

These changes follow the higher connection deposits and tighter construction-payment conditions introduced for BESS projects in April 2026. Together, the measures call for earlier coordination of land negotiations, grid applications and project funding.

Which projects are covered

The October requirement applies to generation and storage facilities connecting at high voltage or above that are not expected to use Japan’s feed-in tariff (FIT) or feed-in premium (FIP) schemes. Low-voltage applications are not presently covered by this particular land-document requirement.

The relevant trigger is the network operator’s acceptance of the connection-contract application on or after 1 October 2026. TEPCO Power Grid expressly confirms that an earlier connection-study application does not exempt a project from the new requirement.

Specific exemptions apply to modifications of existing facilities: (i) upgrades, renewals or renovations on an existing operating site without additional land acquisition; and (ii) modifications involving additional land that do not increase output or otherwise affect the grid.

Two months to submit evidence of land rights

Under the updated procedures published by the Organization for Cross-regional Coordination of Transmission Operators (OCCTO), evidence of land-use rights must generally be submitted within two months after grid-connection consent. Failure to meet the deadline results in cancellation of the confirmed grid-connection reservation. A different deadline may be set where the network operator accepts that reasonable grounds make timely submission difficult.

The financial consequences of missing this deadline can be significant. According to TEPCO Power Grid's FAQ, updated on 9 October 2026, if the applicant fails to submit the required land-use rights documents within two months of grid-connection consent, TEPCO will deem the connection application withdrawn, cancel the confirmed grid-connection reservation and retain any connection deposit already paid. However, where TEPCO recognises reasonable grounds for the delay, it may allow the documents to be submitted by a later deadline. In such cases, the applicant must provide a certificate relating to the proposed transfer or lease of the land and submit the required land-use rights documents within the alternative period specified by TEPCO. An extension is therefore not automatic.

Developers should accordingly ensure that the necessary land documentation can be obtained within the applicable deadline. This includes verifying the registered ownership of each land parcel and, where the applicant is not the registered owner, securing the relevant sale agreement, lease agreement, superficies agreement or written permission to use the land. Particular attention should be paid to projects where land acquisition or lease negotiations are still ongoing at the time of grid-connection consent. Any anticipated delay should be discussed with the relevant network operator sufficiently in advance to avoid the risk of losing the grid-connection reservation and deposit.

What evidence of land rights is required

The required documents should be confirmed with the relevant network operator.

• Hokkaido Electric Power Network, for example, normally requires a full land registry certificate. Where the registered rights-holder differs from the applicant, it also requires a copy of a lease, sale or superficies agreement, or a permission-to-use document in its prescribed format.

• TEPCO further specifies that the documents must cover every land parcel identified in the application.

As a practical matter, projects using a special purpose company should ensure that the documents establish how that company holds, or will obtain, the relevant rights. Land held by a shareholder or another group company requires particular attention to the contractual arrangements. Developers should also confirm that the documented land area matches the proposed site.

Higher financial commitments for battery storage projects

For covered BESS connection-contract applications received on or after 1 April 2026, the deposit under the standard procedure increased from 5% to 10% of the estimated network construction contribution stated in the connection-study response, including consumption tax. For example, an estimated contribution of JPY 100 million including consumption tax gives a deposit of JPY 10 million.

The deposit is credited towards the construction contribution. For batteries co-located with other generation or demand facilities, application of the BESS rules depends on whether the network operator regards the battery as the principal equipment.

The general rule remains full payment of the construction contribution before the network works begin. Where instalments are permitted for qualifying long-duration works, the initial payment for covered BESS projects must now be at least 50% of the total contribution, and higher where required by the relevant construction stage.

The land-document deadline must also be coordinated with other milestones. The existing rules generally require the construction-contribution agreement to be concluded within one month after grid-connection consent. Failure to conclude that agreement within the required period, or to pay the agreed construction contribution, results in cancellation of the confirmed grid-connection reservation.

Implications for project development and acquisitions

In our view, these requirements make the alignment of land rights, grid status and funding a central due diligence issue. Developers and investors should:

• Confirm the relevant application receipt and acceptance dates and the date of grid-connection consent, particularly when acquiring a project already under development.

• Review the land evidence for all relevant parcels and confirm that it supports the position of the entity named in the grid application.

• Allocate responsibility for obtaining documents, meeting deadlines and bearing any lost deposit in development and acquisition agreements.

• Align investment approvals and funding availability with the deposit and construction-payment schedule.

  
  

For acquisitions, these matters should be reflected in the conditions precedent and completion deliverables. Where a deadline falls before closing, the transaction documents should specify who will complete the required steps and what happens if the confirmed grid-connection reservation is lost.

How we can assist

Our team can assist international developers and investors with assessing the applicable regulatory requirements, reviewing land and project agreements, and conducting legal due diligence on Japanese energy projects.