EU Battery Passport 2027: What BESS Developers and Investors Need to Know
From 18 February 2027, industrial batteries with a capacity greater than 2 kWh placed on the EU market or put into service will require an electronic Battery Passport. For utility-scale BESS projects, this introduces a new layer of technical information, data traceability and supplier responsibility that developers and investors should begin addressing before the deadline.
The requirement forms part of Regulation (EU) 2023/1542 concerning batteries and waste batteries, which introduces new sustainability, performance, information and lifecycle requirements across the European battery market.
For the utility-scale Battery Energy Storage System (BESS) sector, the Battery Passport should not be regarded simply as another document to obtain from the battery supplier.
It introduces requirements concerning the availability, accuracy, traceability, accessibility and continued management of battery information and data throughout the battery lifecycle.
This has implications for BESS procurement, supplier assessment, Technical Due Diligence and project risk allocation.
When does the EU Battery Passport become mandatory?
Article 77 of Regulation (EU) 2023/1542 establishes that from 18 February 2027, a Battery Passport will be required for:
- LMT batteries
- Industrial batteries with a capacity greater than 2 kWh
- Electric vehicle batteries
when placed on the EU market or put into service.
Utility-scale BESS batteries will therefore fall within the scope where they meet the relevant industrial-battery criteria.
For projects currently under development or procurement, February 2027 is sufficiently close that Battery Passport readiness should already be considered when evaluating battery technologies and suppliers.
What is a Battery Passport?
The Battery Passport is an electronic record associated with an individual battery.
It contains both information relating to the battery model and information specific to the individual battery, including certain information resulting from its use.
It is therefore substantially more than a static PDF certificate.
The passport must be accessible through a QR code linked to a unique identifier attributed to the battery. The Regulation also specifies relevant ISO/IEC 15459 standards, or equivalent standards, for the QR code and unique identifier.
The information itself must use open standards and an interoperable format and must be machine-readable, structured and searchable. The Regulation also requires transferability through an open interoperable data exchange network without vendor lock-in.
For BESS stakeholders, this means Battery Passport readiness involves not only regulatory documentation but also data architecture, identification, information management and lifecycle processes.
What information does the Battery Passport contain?
The Regulation distinguishes between information relating to the battery model and information relating to the individual battery.
It also establishes different levels of access.
Some information is available publicly, while other information is restricted to parties such as persons with a legitimate interest, notified bodies, market surveillance authorities and the European Commission.
Depending on applicability and access rights, information can include areas such as:
- Battery and manufacturer identification
- Battery model information
- Composition
- Performance and durability
- Dismantling information
- Safety information
- Test information
- State of Health
- Battery status
- Charging and discharging cycles
- Operating conditions
- Other information generated during use
For example, Annex XIII includes detailed composition, dismantling information and safety measures within restricted model-level information. Individual-battery information includes performance and durability parameters, State of Health, battery status, cycle information and certain operating information.
This distinction is particularly important for BESS because some Battery Passport requirements cannot be addressed solely through manufacturer datasheets.
Why does this matter for utility-scale BESS?
A utility-scale BESS involves multiple technical and contractual interfaces.
Depending on the project configuration, relevant information may originate from:
Cell manufacturer → module/rack manufacturer → BESS integrator → BMS provider → EPC contractor → project company / asset owner
The information needed to support a Battery Passport may therefore be distributed across several organisations and technical systems.
A developer may have a comprehensive BESS specification while still lacking controlled evidence for a particular battery parameter.
A BMS may display State of Health while the definition, source, access method or data governance arrangements remain insufficiently documented.
A supplier may provide battery composition information while responsibilities for updating lifecycle information remain unclear.
These are fundamentally technical interface and evidence-management issues, which makes Battery Passport readiness relevant to Technical Due Diligence.
The role of the BMS and battery data
Some of the most significant Battery Passport requirements relate to information that changes during the battery lifecycle.
Annex XIII specifically includes, for persons with the relevant access rights, information such as:
- State of Health
- Battery status
- Charging and discharging cycles
- Negative events such as accidents
- Operating temperature information
- State of Charge information
For BESS projects, this creates practical questions.
Is the required parameter available from the BMS?
How is it defined?
Which system is the authoritative source?
Can the relevant party access it?
Who is responsible for updating the Battery Passport?
Does the data remain traceable following software or firmware changes?
The existence of a value on a BMS screen does not by itself resolve all these questions.
Battery Passport readiness therefore requires consideration of the relationship between battery hardware, BMS data, supplier documentation and the digital passport infrastructure.
Who is responsible for the Battery Passport?
This is another important point for project stakeholders.
The Regulation places responsibility on the economic operator placing the battery on the market or putting it into service to ensure that information in the Battery Passport is accurate, complete and up to date.
However, the Regulation expressly allows that economic operator to give written authorisation to another operator to act on its behalf.
Article 78 also allows Battery Passport data to be stored by operators authorised to act on behalf of the responsible economic operator.
This creates scope for specialist technology and technical-service providers to support implementation.
It does not, however, remove the need for clearly defined contractual responsibilities between the battery manufacturer, integrator, economic operator and other project participants.
What should BESS developers be asking suppliers now?
For BESS projects expected to procure or commission batteries around the 2027 implementation period, developers should consider incorporating Battery Passport readiness into supplier discussions.
Relevant questions include:
1. Has the supplier established which Battery Passport requirements apply to the proposed battery?
2. Is there a defined unique identification and serialisation architecture?
3. Is the required model-level technical information available and supported by controlled evidence?
4. Which required lifecycle parameters are available from the BMS?
5. Are those parameters clearly defined and traceable to their source?
6. How will access to restricted Battery Passport information be managed?
7. Which organisation will create and maintain the Battery Passport?
8. How will information be updated throughout the battery lifecycle?
9. Which responsibilities remain with the cell manufacturer, BESS integrator, BMS provider and asset owner?
10. Can the supplier demonstrate a credible implementation plan ahead of February 2027?
These questions can be incorporated into an RFP or technical information request before supplier selection.
For investors and lenders, Battery Passport readiness can form part of the wider assessment of a proposed BESS technology and supplier.
A practical review should consider:
Regulatory applicability
Which requirements apply to the battery technology and project?
Documentation
Is the required technical information available?
Evidence
Can the information be supported by appropriate controlled documentation?
BMS and data
Are the relevant battery parameters available, defined, traceable and accessible?
Supplier readiness
Can the manufacturer or integrator provide the information and systems required?
Responsibilities
Are responsibilities for supplying, maintaining and updating information clearly allocated?
Gaps and actions
What remains outstanding, who is responsible and when must it be resolved?
This can be incorporated into BESS Technical Due Diligence rather than treated as an isolated compliance exercise.
Battery Passport data must remain accessible
There is another issue that deserves attention when selecting a Battery Passport solution.
Article 78 requires the passport to remain available even if the economic operator responsible for it ceases to exist or ceases its activity in the European Union.
The Regulation also requires appropriate access controls, data authentication, reliability, integrity, security and privacy.
Consequently, developers and suppliers should consider not only how a Battery Passport will initially be created, but also:
data ownership, portability, long-term availability, access management and business continuity.
This should be considered when selecting a Battery Passport technology provider.
What should BESS developers and investors do before February 2027?
The immediate priority does not necessarily need to be implementation of a complete Battery Passport platform.
A sensible first step is to establish readiness.
For projects currently under procurement or due diligence, this means identifying:
what information will be required → where that information originates → what evidence exists → what is missing → who is responsible for providing it → how it will ultimately be maintained.
Addressing these questions early provides an opportunity to incorporate outstanding requirements into supplier negotiations and project documentation rather than attempting to resolve them shortly before batteries are placed on the EU market or put into service.
KRD Renewables provides independent Battery Passport Readiness Assessments for utility-scale BESS projects and battery suppliers.
Our assessment considers:
- Regulatory applicability
- Battery and supplier documentation
- Technical evidence
- BMS and battery data readiness
- Information traceability
- Supplier readiness
- Responsibilities and data governance
- Outstanding actions
The assessment can be delivered as a standalone review or incorporated into KRD’s BESS Technical Due Diligence and supplier assessment services.
Assess Battery Passport Readiness
Explore our Battery Passport Readiness Assessment and BESS technical due diligence services. Discuss supplier documentation, BMS data, responsibilities and outstanding readiness actions with our team.
The KRD Battery Passport Readiness Assessment is a technical and documentation readiness review. It does not constitute legal advice, certification, conformity assessment or a determination of regulatory compliance or market-access eligibility.
