An industrial BESS (battery energy storage system) is not an off-the-shelf purchase. It is an infrastructure project. From the day a company begins consideri...

An industrial BESS (battery energy storage system) is not an off-the-shelf purchase. It is an infrastructure project. From the day a company begins considering a battery system to the day it runs, there is a chain of decisions, agreements, physical work, and authority processes that involves more parties than most expect. For a decision-maker, typically a CFO, a managing director, or an operations lead, knowing the full journey in advance matters more than knowing isolated technical details. That is the difference between entering a project with realistic expectations and being surprised along the way.

This guide is a combined overview of the entire installation journey. It covers the phases from first meeting to go-live, who is involved and who does what, a typical time horizon and why it is a range rather than a date, what it means that we at ZynexGroup handle most of the work, how payment links to project milestones, the groundwater protection built into our installations, and the two product tracks a company can choose between. At the end we answer the questions we hear most often. Each topic has its own article in this guide, where it is treated in depth, and the guide points to those articles throughout for anyone who wants to go deeper into a single stage.

Phase overview: from first dialogue to go-live

A BESS project follows a recognisable sequence that can be divided into eight phases. The early phases sit before signature, the middle phases run in parallel, and the last ones take a physically complete system into operation. The overview here is deliberately short. The detailed timeline with parallel tracks is described in the article on a realistic timeline.

Initial dialogue. It begins with a conversation about the company's goals and premises, and about where on the site a system could be placed. The purpose is not to design the system, but to understand what the company wants to achieve.

Match and go/no-go. Next, it is clarified whether there is a basic match. Two factors weigh heaviest: a grid connection of at least 400A, and an address where the system can be built legally. This screening, and what happens in the weeks before a signature, is covered in the article on the path from decision to contract, and the suitability assessment of the site has its own article on site assessment.

Contract and first payment. If the screening holds, a contract is signed, and the first part of the payment falls due before we order the system from the supplier. This is where the project formally begins.

Ordering. The battery itself must be manufactured and transported. That part takes time; we work from an indicative estimate of around 90 days, but it is a planning figure, not a guarantee, and it is the longest continuous wait in the project.

Parallel site work. While the battery is in production and transit, the site is prepared. A contractor carries out excavation, casts the foundation, and establishes the physical containment that collects liquid in the event of a fire. An authorised electrical installer prepares the switchboard, cables, and often a new distribution board that connects the system to the local electricity grid. In parallel, dialogue continues with the grid company (the local distribution system operator) and the municipality. The physical preparation work has its own article in the guide.

Delivery. When the modules arrive in Denmark, the foundation must have cured, the distribution board must be in place, and the electrical installation must be prepared so the modules can be set up and connected.

Setup, testing, and approval. Next comes a phase of setup and testing. An electrical installation must be verified before it is taken into use, and that verification consists of an inspection, testing with gradual energisation, and reporting. For a battery there is an extra step on top, because the grid company first issues a temporary grid connection permit under which the system's technical properties are tested, and only grants the final permit once the tests are approved. That is why time is allocated for testing and approval, not only for the physical installation itself. Commissioning and handover are described in their own article.

Operation and market. Finally the system goes into operation, and handover coincides with the second payment. For a turnkey system with a minimum of two modules, this is also where access to the electricity market comes into play, which we facilitate through an aggregation partner once the technical tests are complete. At handover the customer receives operating documentation and a system in operation that we monitor through our own system, and the dedicated contact person continues into the operating phase.

The sequence matters because several phases run in parallel rather than one after another. That is exactly what makes the total duration shorter than the sum of the individual parts.

Who is involved, and who does what

One of the most common questions from a company about to sign is how many suppliers it must find and manage itself. The answer depends on which product track is chosen, but in the turnkey path there are typically six parties whose roles are worth keeping distinct. Role allocation on the construction site itself has its own article in the guide; here the purpose is to give a combined picture.

ZynexGroup handles project management. We supply the hardware and the software that monitors the system, and we coordinate the tradespeople who carry out the physical work. We also lead the dialogue with the grid company, the municipality, and Energinet (Denmark's transmission system operator) and apply for the relevant permits. We are the ones who enter into the agreements with the third parties the project requires, and pay them, unless otherwise agreed in the contract.
The customer contributes requirements and preferences, input on placement, and access to the site, and must ensure that the system can be built legally at the address. The customer remains the formal owner and client (bygherre), even though we coordinate the parties who carry out the work.
The electrical installer handles the electrical side: switchboard work, cables, often a new distribution board, and the local grid connection. Work on fixed electrical installations may only be carried out by an authorised electrical installation company, and that part can be performed by neither the customer nor us.
The contractor handles the heavy civil works: excavation, the cast foundation, site preparation, and the physical containment under and around the system.
The grid company owns and operates the local electricity grid and decides on the grid connection. Processing time is variable and cannot be fixed in advance.
The municipality is the building authority and also acts as planning authority, through its emergency services, and as the authority for groundwater. It is the individual municipality that processes building cases and issues building permits and can set local frameworks via a local plan.

A point that is often overlooked is what happens when several trades are on site at the same time. As soon as at least two companies must work on a construction site simultaneously, the client is responsible for ensuring that cooperation on occupational health and safety between the companies is coordinated, and a health and safety coordinator must be appointed. This is not specific to battery systems, but a general rule for construction and civil works, and it is precisely the type of coordination a turnkey path gathers in one place. The legal roles as owner and client remain with the customer, while practical management sits with us.

A typical time horizon: why a range, not a date

One of the very first questions is about time: how long from signature until the system is running? For a typical system of two to three modules in the turnkey path, we work from a total time horizon on the order of approximately 100 to 120 days. That is an indicative planning range, not a guaranteed date, and it is worth understanding why.

The clock effectively starts at contract and first payment, because the system cannot be ordered before then. Battery manufacturing and transport time is the longest continuous wait, and that window is used to push construction, electrical work, and authority dialogue as far forward as possible. Because those tracks run in parallel, the total is shorter than the sum of the phases. If one of the variable tracks stretches out, the overall timeline extends accordingly. That applies especially if a grid case ends in physical grid reinforcement rather than a changed agreement on an existing connection, which is a rarer exception but can push the project to the long end of the range or beyond.

The most important source of uncertainty is the authority tracks. Grid connection and building permit are independent processes whose duration neither we nor the customer can fix in advance. For the grid, only once the grid connection agreement is in place does the grid company's project manager contact the customer and agree a start time and an expected date for when the system can be taken into use. There is therefore no fixed processing time that can be promised in advance. In most turnkey projects the matter is a changed agreement on an existing connection. In exceptional cases a new connection point must be built, which requires excavation and an excavation permit from the municipality. Two otherwise identical systems can therefore have very different timelines solely because of local grid capacity. The realistic timeline from signature to go-live is described in detail in its own article in the guide.

What it means that we handle most of it

The core of a turnkey path is that one party binds the others together, so the company does not have to assemble and manage each link itself. When we say that we handle most of it, that covers a set of concrete points that are worth making precise.

Partner coordination. We enter into agreements with and coordinate the electrical installer and the contractor, and we manage the sequence on site so the trades work in the right order and shared arrangements are agreed in advance.

Grid application. We prepare and handle the grid connection application together with the electrical installer, so the company does not have to navigate the grid company's systems itself. In most turnkey projects this builds on an existing connection and a changed grid connection agreement, typically about feed-in scope and metering, rather than physical reinforcement of the grid. One boundary is worth knowing: a grid connection agreement is an agreement between the customer as system owner and the grid company, not between the grid company and us. The customer is therefore the formal contracting party, while we prepare the basis and coordinate the process. The application process at the grid company is covered in the article on grid connection.

Energinet and system requirements. Beyond the local grid connection there is a system level, where Energinet is Denmark's transmission system operator, while the grid companies are distribution system operators that operate the electricity grid locally. We lead the dialogue with Energinet on the system conditions that apply beyond the local connection. The technical requirements for how a system may behave on the grid, often gathered under the term grid code, are set at European level in Commission Regulation (EU) 2016/631, known as the RfG Regulation, which frames the requirements by the voltage level at the connection point and the system's maximum power. Energinet and system requirements have their own article in the guide.

Municipality and building permit. We handle dialogue with the municipality and apply for the relevant fire and building permits. That covers the building case, dialogue with the municipal emergency services, and the planning and groundwater questions that the placement raises. The municipal process is covered in its own article.

Market access via an aggregation partner. For a turnkey system with a minimum of two modules, we facilitate access to the electricity market through an aggregation partner. Here is a boundary that is important to state precisely: we are not the balance-responsible party for the asset toward the power system. Market participation itself happens via a partner that holds that role, and we work to make market access possible within the agreement's technical and contractual frame. Whether and when market access can be realised does not depend on us alone, but also on technical requirements, prequalification, the specific site, the partner, the grid company, and the applicable regulation. The electricity market itself is covered in the track of our material that deals with the market and Energinet's market side.

The customer, in turn, supplies requirements, placement, and access, and ensures that there is a lawful building option at the address. Throughout the process the company also has one dedicated contact person with us from the first enquiry, so the same person knows the project from the initial dialogue through ongoing coordination.

The aim of that coordination is that the process is as unobtrusive for the company as possible. But it is worth being honest that coordination does not remove the bureaucracy itself. Grid, municipality, and Energinet remain independent processes with their own requirements and case handling, and what we do is take the work with them off the company's hands and keep the overview, not make them disappear. What a company pays for is not having to navigate those tracks and manage them one by one, not a shortcut past the authorities that must grant their permits regardless of supplier.

Payment linked to project milestones

Payment in our standard model is split in two and tied to project milestones. Forty percent is paid at contract signing, before we order the system from the supplier, and the remaining 60 percent at go-live, that is when the system is put into operation. The first payment is therefore the milestone that triggers the order, and the second coincides with go-live and handover.

That link has a practical consequence for the timeline. Because ordering can only happen after contract and first payment, the company's internal approval process has a direct effect on when the clock starts counting. An investment of this size typically needs to pass a CFO and in many cases a board, and the earlier that mandate is in place, the less waiting time there is once the technical assessment points to a match. The payment model itself, how it is structured as a fixed contractual availability payment, and what it assumes, is described in the track of our material that deals with the payment model. In this context the point is simply that the two payments are bound to two concrete milestones: contract and ordering on one side, go-live on the other.

Groundwater and containment: a physical barrier, not a green label

One of the factors that matters most for companies with environmental requirements, for neighbours close to residential areas, and for systems in groundwater-sensitive areas is what happens to liquid if the worst occurs. 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. The requirements stem from an approval under particularly strict groundwater protection and typically go beyond a standard BESS foundation. It is a physical barrier and an approved design, not a green label.

The rationale behind such a barrier is well known from environmental regulation of industrial companies. Experience from soil and groundwater contamination shows that preventive physical measures could have avoided or substantially reduced contamination, and that protection should be designed with regard to, among other things, the system's placement relative to groundwater interests and neighbouring land. Placement relative to groundwater is regulated separately. In areas with special drinking-water interests, in abstraction catchments, and in borehole protection zones (BNBO), municipalities must in their planning keep land free of new facilities that could pose a risk of groundwater contamination. If a placement requires the risk to be mitigated, it triggers a groundwater statement in which the municipality must account for the necessary protective measures. An approved containment is precisely the type of concrete measure that can make a placement defensible in a sensitive area.

We treat groundwater protection as a real part of the physical design, not as an add-on. Containment does not remove the risk of a fire, and we cannot promise a particular outcome of a fire. We also do not name a specific municipality. But we can explain what the barrier is for, and why it matters for a company in a groundwater-sensitive area or close to neighbours. The physical containment itself, and how it is executed, is described in the guide's article on physical preparation work, and the same dialogue from the authorities' perspective is covered in the article on the municipality.

The two product tracks: standard turnkey and single module

A company can in practice choose between two tracks, and it is worth knowing the difference from the start, because they are not the same product.

Standard turnkey is our primary model. It is built around a minimum of two modules and typically assumes a grid connection of at least 400A, which in a standard 400V three-phase system corresponds to a power of approximately 277 kW. Prices are communicated excluding VAT, and a module in this model costs on the order of 396,000 kroner. This is where the full coordination and market side rest: we handle the complete turnkey path with partners, grid application, Energinet, municipality, and market access via an aggregation partner, and the customer has one dedicated contact person through the process.

Single module is a narrower track. A company can in principle buy modules without the full service package, but that is a different product from turnkey, not a cheaper version of the same thing. Here the customer handles market participation themselves, and we deliver operating documentation rather than the complete coordinated path with market optimisation. That means a larger share of coordination and the market side sits with the customer. We therefore do not present the single module as the same solution where most of the work is taken off their hands; it is a deliberately bounded product, and how much a company must handle itself depends directly on which of the two tracks is chosen.

The reason the market side requires a certain scale and a specialised partner relates to how a battery business looks in practice. Access to markets for system services requires that the system is prequalified, that is tested and approved by Energinet, before it may participate, and revenue from system services cannot according to the industry stand alone, so batteries typically also participate in the spot and intraday markets, where larger volumes of electricity are traded. That kind of ongoing optimisation across markets is what an aggregation partner handles, and it does not come with a single module.

ZynexGroup's approach to system assessment

We never start with the system. We start with the company's data: the size of the grid connection in amperes, the consumption profile across the day and year, and the site conditions that determine whether a system can be built legally. On that basis we can have a data-based dialogue about whether there is a match, before time is spent on a detailed design.

Our role in the assessment is not to sell a particular system, but to reach an honest yes or no. Some of the factors an assessment uncovers sit within the company's own plot and can be resolved with the right preparation work. Others, such as the grid connection and the building permit, sit with the grid company and the municipality, where we can prepare and handle the dialogue thoroughly, but cannot guarantee in advance either a grid approval or a building permit. We treat the critical tracks, grid, components, and municipality, as independent processes that we manage in parallel and start early, precisely because that is where the timeline uncertainty sits. When something slips, we report it, rather than promising a date we cannot keep.

When we assess that an installation is technically and economically realistic on that basis, it also includes that we offer a 6-year payback guarantee on BESS systems. It is tied to the payment model in the standard model and does not change the fact that grid and authorities are independent processes with their own uncertainty.

Frequently asked questions

How long does it take? For a typical system of two to three modules in the turnkey path, we work from a total time horizon on the order of approximately 100 to 120 days. That is an indicative planning range, not a guaranteed date. The clock starts at contract and first payment, and battery manufacturing and transport time is used to run construction, electrical work, and authority dialogue in parallel. What can move the plan is especially grid and building permit, which are independent authority processes without a fixed processing time.

What typically causes delays? Three factors most often lie behind a delay, in roughly this order. The first is battery transport, which is the longest continuous wait and sits outside what can be accelerated locally. The second is delivery of the distribution board, because a system of this size often requires a new board, and because there is national demand for that type of component. The third is the grid application and the building permit, which are the least controllable tracks, because the decisions sit with the grid company and the municipality. Typical delays and what goes wrong are covered in their own honest failure guide in this guide.

What should we prepare? Four things make a concrete difference to whether a process lands at the short or the long end. Early internal approval, because ordering can only happen after contract and first payment. Early data, that is the size of the grid connection in amperes and a consumption profile that shows the real power peaks. Early clarification of placement and that the system can be built legally at the address. And early grid dialogue, because the grid track is the most variable. A battery requires a connection that can both draw and send electricity, and an existing delivery scope is not in itself the same as capacity for a battery.

Do we get a customer portal where we can follow the system? No. Handover does not include a customer portal with login or a dashboard where the customer can follow the system in real time themselves. That is not part of what we deliver at commissioning today. Monitoring is an operational task we carry out through our own system, and contact goes through the dedicated contact person. At handover the customer receives operating documentation, a system in operation, and the dedicated contact person.

When can we say no, and when is BESS not the right fit? The screening is built to reach an honest yes or no, and a company can step back at any point before a contract is signed. A battery is less suitable with a very flat consumption profile without clear power peaks, if the company does not own its plot, or if the grid connection is too low. On top of that comes a premise that can emerge after contract signing: if a sufficient grid connection cannot be realised after a reasonable attempt, the project can be discontinued after the contract, and payments are handled as agreed in the contract. When a BESS system is not the right solution is covered separately in our material.

The deeper articles, and when to go further

This article is an overview. The articles below go into depth on each corner. They can be read on their own, depending on what is relevant.

From decision to contract: What happens in the weeks before you sign?: What happens from decision to signature. Relevant when you are considering going further.
Site assessment: How to assess whether your site is suitable for BESS: Checklist for site suitability. Relevant before go/no-go.
Space requirements, foundation, and fire safety: The physical preparation work: Space, foundation, and fire safety. Relevant during physical preparation.
Grid connection: How the application at the grid company works: The grid application step by step. Relevant when the grid track needs to be understood.
Energinet and system requirements: Telemetry, metering, and grid code: Energinet, telemetry, and grid code. Relevant after local grid connection.
Municipality, construction, and permits: When to engage with the municipality: Municipal dialogue and permits. Relevant for construction and fire.
Electrical installer, contractor, and ZynexGroup: Who does what on the construction site?: Role allocation on the construction site. Relevant before project start.
Realistic timeline: From signature to go-live for a typical 2-3 module system: Realistic timeline with parallel tracks. Relevant for internal planning.
Commissioning, testing, and handover: When is the system ready for operation?: Testing, approval, and handover. Relevant toward go-live.
Typical delays and what goes wrong: An honest failure guide: Typical delays and failures. Relevant for risk management.

Overall perspective

A BESS installation in Denmark is an infrastructure project, not a purchase, and it makes most sense when the full journey is known in advance. The process runs from an initial dialogue through a go/no-go assessment to a contract, an order, parallel site work, and testing, before the system goes into operation and possibly into the market. Along the way six parties work together: us, the customer, the electrical installer, the contractor, the grid company, and the municipality. Total time is a range of typically approximately 100 to 120 days for a system of two to three modules, not a fixed date, because grid and building permit are independent authority processes. That we handle most of it means that we coordinate partners, grid application, Energinet, municipality, and market access via an aggregation partner, while the customer supplies requirements, placement, and access and remains owner and client. Payment is linked to two milestones, groundwater protection is a real physical barrier, and the two product tracks correspond to two different needs. A company that enters the project with data, internal mandate, and a clarified placement has the best starting point for a process without surprises.

Have the potential for your facility assessed

If you are considering an industrial BESS system, the natural starting point is the data this guide has described: your grid connection in amperes, your consumption profile and your historical consumption data, together with the preferred placement on the site. We use that type of information for an initial assessment of whether there is a match, and for a data-based dialogue about how a process would realistically look for you. You are welcome to contact us here.

The complete guide to BESS installation in Denmark: Process, parties, timeline, and what ZynexGroup handles