What does it take, physically, to install an industrial BESS facility?

When a company decides to integrate industrial battery storage, practical questions quickly arise for the person responsible for operations. An industrial BESS facility is not simply a component placed in a warehouse; it is a technical, grid-connected energy storage installation that, in practice, requires physical space, electrical integration, and a project-based clarification of relevant building conditions and fire safety conditions.

To identify the specific requirements for installing a BESS facility, it is necessary to treat the project as a complete infrastructure project. This article covers the physical, electrical, and regulatory prerequisites for establishing a facility on a Danish business site. The aim is to give a clear overview of space requirements, installation, and allocation of responsibility.

Footprint and foundation

The first practical question is typically how much space the facility occupies. There is no single public standard size for all facilities, so the specific footprint must be determined from the chosen configuration and the siting requirements documented in the project. It is a project assessment, not a fixed norm.

The particular solution must be assessed with regard to suitable placement and any setback requirements. The Danish Emergency Management Agency (Beredskabsstyrelsen) guidance on fire safety for larger lithium-ion battery storage and BESS describes that installation and placement must be assessed case by case, and that distances, access conditions, and fire risk form part of that assessment. The guidance therefore supports the point that space needs must be established for each individual project.

Energinet (Denmark's national transmission system operator) regulation on requirements for energy storage facilities assumes that the project can document the technical conditions around the facility, including data on the facility's power and capacity. The regulation does not, by itself, state how much physical space the associated infrastructure requires.

Electrical infrastructure and grid connection

A BESS facility works by drawing electricity from the grid, storing it, and sending it back to the company's internal network or out onto the collective electricity grid. This places specific demands on the company's existing electrical installations.

The facility must be connected to the company's existing electrical infrastructure. Energinet's regulation on requirements for energy storage facilities describes requirements for the point of connection and technical documentation, while it is a project-level assessment whether switchboard capacity, protection, and the desired integration can be handled within the current framework, or whether adaptations are needed. There is therefore no documented general rule that an electrical switchboard must always be upgraded.

In connection with grid connection, the relevant system operator may require technical data on the facility as part of the connection process. That can include the facility's rated power, usable energy capacity, manufacturer, model number, and relevant declarations of conformity, as described in Energinet's regulation on requirements for energy storage facilities.

Safety zones and fire requirements

Safety is a central element in the physical placement of a BESS facility. Lithium-ion batteries contain large amounts of energy, and in a thermal runaway event a fault can develop quickly into fire and smoke, which is part of the risk assessment Beredskabsstyrelsen describes in the guidance on fire safety for larger lithium-ion battery storage and BESS. The guidance indicates that placement, distances, and access conditions must be assessed case by case for each individual project.

Authority review and building permits

Whether a building permit is needed depends on the municipality's assessment of placement on the site, distances, fire conditions, and whether the installation changes the buildings or the use of the site in a way that triggers the building-permit process. This clarification applies especially when the BESS components form a physical installation on the site, rather than pure internal electrical integration.

ZynexGroup's approach to facility assessment

We can contribute early in the process with data analysis, sizing, and system design, so the project has a technical basis that can be used in dialogue with authorities and other relevant professionals. Our role is to gather and structure the technical part of the preparatory work, while the final authority clarification and the physical execution are handled by the responsible parties in the concrete project process.

Overall perspective

Installing an industrial BESS facility is a structured process that requires preparation. In the specific project, a suitable area must be set aside, space must be available for the necessary electrical infrastructure, and an assessment of safety, placement, and access conditions must be carried out.

Grid connection requires technical documentation under Energinet's regulation on requirements for energy storage facilities, including the information on power, capacity, manufacturer, model number, and declarations of conformity that the regulation describes. By recognising the BESS installation as an infrastructure project from the outset, planning can proceed on a better-informed basis.

Closing note

If battery storage is under consideration, it is relevant to clarify the physical, electrical, and regulatory frameworks for the specific location. The contact form is available for an initial enquiry.