Municipality, construction, and permits: When does dialogue with the municipality begin?

An industrial BESS (battery energy storage system) is not a piece of equipment a company simply places on site. It is a fixed installation on a plot of land, and that means the municipality enters the picture long before the system can be put into operation. For a decision-maker it is often unclear when and why the municipality must be involved. The answer is that the municipality appears in several roles at once: as building authority, as planning authority, through its municipal emergency service (redningsberedskab), and as the authority for groundwater.

This article walks through when the different tracks are triggered, and what they cover: when a system requires a building permit, how a local plan and rural zoning can set local frameworks, how fire is assessed by the municipal emergency service, and how groundwater considerations are handled in the municipality's planning. The aim is to make the bureaucracy understandable. It is not legal advice, because the specific decision always depends on the individual site and is clarified in dialogue with the municipality.

When a system requires a building permit

The first track is the building permit process. A battery system of industrial scale rests on a cast foundation and is a permanent structure, so it is treated under the ordinary rules for construction. The Danish Building Act (Byggeloven) applies to the construction, alteration, and demolition of buildings. The Building Regulations (Bygningsreglementet), an executive order under the Building Act, set a minimum level for the construction's properties. The rules are not about the battery itself, but about the construction it constitutes on the plot.

Responsibility for complying with the rules lies with the building owner, but the decision lies with the municipality. In practice it is the individual municipality that processes building applications and issues a building permit and any exemption. The municipality is therefore the building authority and assesses whether a particular project can be permitted at the address. Whether a given system requires a building permit depends on the character and scale of the project, and that is clarified early.

The application itself is digital. An application for a building permit is submitted to the municipality via the application portal Byg og Miljø (Build and Environment), where based on the address, applicants can see which rules apply on the site, and which documentation the municipality needs. Correspondence then takes place in the portal until the municipality has reached its decision. The building permit is therefore a standalone authority process that must be in place before the system can lawfully be erected.

Planning and local frameworks: local plan and rural zone

The Building Act is not the only set of rules the municipality can bring into play. In addition to the Building Act and the Building Regulations, other legislation may be relevant, including the Planning Act (Planloven), which regulates construction in rural zones and in areas covered by a local plan, and the Environmental Protection Act (Miljøbeskyttelsesloven). The placement of a system can therefore be subject to local frameworks beyond the general building rules.

The most common local framework is the local plan (lokalplan). The municipality processes building applications under the Building Regulations, but in certain areas the municipality can set stricter or different rules, and that happens by the municipality adopting a local plan. A local plan can regulate what an area may be used for, and how building may take place, and it can therefore matter for whether a battery system can be placed at a particular location. There may also be restrictions in registered easements on the property.

If the plot lies in a rural zone (landzone), an extra track comes into play. In a rural zone, erecting new construction or changing the use of land generally requires a rural-zone permit, and it is the municipal council that is the authority and, for each application, must weigh the considerations behind the rules in the specific case. The purpose is to avoid scattered development in the open countryside. There are exceptions in the Planning Act's provisions, but the starting point is that a new system in a rural zone requires a permit. Whether a local plan or rural zoning comes into play is site-specific and something that must be mapped for the specific address.

Fire and the municipal emergency service

Fire is the third track, and here it runs through the municipal emergency service. The background is that lithium-ion batteries contain large amounts of energy, and that a larger system is therefore treated as a fire risk. The fire-prevention rules are set under the Emergency Management Act (Beredskabsloven), and in certain cases the municipal council may decide that buildings and land areas posing a certain risk must be arranged and used to reduce the fire risk as far as possible and to secure adequate rescue and extinguishing options as far as possible. That is the provision a larger BESS is typically assessed under, and the rules function as an overlay on the fire requirements in the Building Regulations.

In practice it is the municipal emergency service that handles the case. The Danish Emergency Management Agency (Beredskabsstyrelsen) administers the rules for the larger fire- and explosion-hazardous enterprises, while the municipal council in other cases has the responsibility, and the work is most often carried out by the municipality's emergency administration. It is therefore the municipal emergency service that a company typically discusses fire conditions with.

The Danish Emergency Management Agency's guidance on fire protection describes when dialogue should begin. When a company intends to install a larger BESS, the company should contact the municipal emergency service to hear whether fire-related conditions will be set for the system. As a guiding benchmark, the guidance treats a storage installation as larger when the total capacity exceeds 2,000 kWh. The conditions can include, among other things, placing the system at a proper distance from boundaries and buildings, but the precise conditions are set on a case-by-case basis. There is no single fixed distance in metres that applies to all systems.

Groundwater protection in municipal planning

The fourth track is groundwater, and it is often what matters most for whether a placement is possible at all. Here the municipality appears as the authority that in its planning must take drinking water into account. The protection is tied to three designations from the national groundwater mapping: areas with special drinking water interests (OSD), abstraction catchments for public waterworks outside OSD, and borehole-near protection areas (BNBO).

The rules place requirements on the municipality's land-use planning. Municipalities must keep OSD and abstraction catchments free of new enterprise types and installations that may pose a significant risk of groundwater contamination, and borehole-near areas must be kept free of land use that can increase the risk. Assessing whether a system may pose a risk is the municipality's task. If a desired placement lies in one of these areas, it is therefore not given that a system can simply be erected there.

There is still a path forward when a placement requires measures to avert the risk. If a use requires measures to avert a risk of contamination, it triggers a groundwater statement in which the municipality must account for the necessary mitigation measures. This is where a physical barrier comes in. Our installations are based on a municipally approved solution dimensioned to prevent liquid from a fire, including extinguishing water from the fire service, from carrying battery chemistry into the groundwater. That solution is precisely the type of mitigation measure a municipality can rely on to consider a placement defensible in a sensitive area. The physical containment lining itself, and who carries it out, is described in its own track in the guide on the physical preparation work; here the point is only that it corresponds to what the authority asks for.

ZynexGroup's approach to site assessment

We handle the dialogue with the municipality and the building permit process on the company's behalf and apply for the relevant fire and building permits. That covers the building application via Byg og Miljø, dialogue with the municipal emergency service, and the planning and groundwater questions that the placement raises. A central part of the value in a turnkey process is that the company does not itself have to navigate the four tracks and the different parts of the municipal administration.

We treat groundwater protection as a real part of the solution. The containment lining we prepare is a physical barrier that has been approved in practice under particularly strict groundwater protection, and that typically sits above a standard BESS foundation. We can explain what the barrier is for, but we cannot promise a particular outcome of a fire, and we do not name a particular municipality. We also cannot guarantee in advance a building permit or a particular answer from the municipal emergency service, because the decisions lie with the authorities. Throughout the process, the company has one fixed contact person with us, so that the same person knows the case from the initial dialogue through to ongoing contact with the municipality.

Limitations and preconditions

The municipal process contains conditions that lie outside both our and the customer's control. Whether a system requires a building permit, whether a local plan or a rural-zone permit comes into play, and which fire conditions the municipal emergency service sets, are decided for the specific address. The same applies to groundwater: if the plot lies in a protected area, that can impose requirements that affect both design and schedule, and in some cases a placement may turn out not to be possible. For that reason the best approach is to identify those conditions early, while they can still be accounted for.

Processing time is a separate uncertainty. There is no fixed processing time, either with the municipality or with the grid company, and building permit and grid application are among the tracks that most often become a bottleneck. Grid connection is its own authority track and is covered in the guide's article on the application to the grid company, just as the schedule and typical delays are described separately. The point is that the municipal permits are standalone processes that a schedule must treat as estimates, not as fixed dates.

Overall perspective

The municipality enters a BESS project because a battery system is a fixed installation that touches several considerations at once. As building authority, the municipality assesses the construction itself, and the application goes via Byg og Miljø. As planning authority, it can via local plan and rural-zone rules set local frameworks for where and how building may take place. Through the municipal emergency service, it can set fire-related conditions for a larger system. And as the authority for groundwater, it must ensure that a placement in a sensitive area does not increase the risk of contamination, if necessary through mitigation measures such as an approved containment lining. A company that knows the tracks early can enter the dialogue with the municipality prepared, rather than being surprised along the way.

Interested in an assessment of your facility's potential?

If you are considering an industrial BESS, the municipal process is part of the overall assessment: where the system is to be placed, whether the address lies in an area covered by a local plan or in a rural zone, and whether the plot lies in a groundwater-sensitive area. We use that type of information together with your grid connection and consumption profile for an initial assessment of whether there is a match, and for a data-based dialogue about the next steps, including what municipal dialogue at the address realistically involves. You are welcome to contact us here.