Realistic timeline: From signing to go-live for a typical 2-3 module system

One of the first questions a decision-maker asks about an industrial BESS (battery energy storage system) is how long it takes from signing until the system is running. The answer is rarely a single date. A battery system is not an off-the-shelf purchase, but an infrastructure project with several tracks running in parallel: ordering and transport of the battery, the physical construction work, the electrical installation, and the authority processes with the grid company (the local distribution system operator) and the municipality. Some tracks we can control tightly; others we can prepare thoroughly without being able to set a date.

This article walks through a realistic timeline for a typical system of two to three modules in the turnkey process: the phases from signing to operation, how the parallel tracks fit together, how the milestones link to payment, where the bottlenecks sit, and what a company itself can do to keep the timeline short. All time figures are indicative planning numbers, not guaranteed dates. Precisely because grid connection and building permit are independent processes, it is more honest to speak in intervals and preconditions than about a fixed delivery date.

The starting point: contract and the first payment

The timeline effectively begins with the contract. Before signing, there is an initial dialogue and a go/no-go assessment of whether there is a match on grid connection and site. That process is described in its own article in this guide and is not part of the installation time itself.

Signing is also tied to the first payment. In our model, 40 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 payment model itself is described in its own article; here the point is that the first payment is the milestone that triggers the order. A system cannot be ordered until the contract and first payment are in place, and the company's internal approval process therefore has a direct bearing on when the clock starts counting.

The real start date thus often depends more on internal approval than on anything that rests with us. A system of this size 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. If that precondition is in place, and the decision has been taken, the process can begin.

Ordering and the three parallel tracks

As soon as the contract is in place and the first payment is registered, we order the system. The battery itself must be produced and transported, and that part is around 90 days as a planning estimate. That is a planning figure, not a guarantee, and it depends among other things on production queues and transport. Because it is the longest single waiting period in the project, it is important that the period is not spent passively.

Here lies the key to a realistic timeline: while the battery is in production and transport, three tracks run in parallel.

• The battery track: Production and shipment of the modules towards delivery in Denmark. This is the track that sets the basic rhythm of the project.
• The construction track: The contractor carries out excavation, casts the foundation, and prepares the site, including the physical containment lining that collects liquid in the event of a fire. The foundation is typically completed first, so that it is cured when the modules arrive. The physical preparatory work with foundation, fire, and groundwater is described in its own article in the guide.
• The electrical and grid track: An authorised electrical installer prepares the cables and often a new electrical panel that connects the system to the local electricity grid. In parallel, the grid application is prepared and submitted, typically as an amended connection on existing infrastructure, and the dialogue with the municipality about the building permit is conducted.

Because the three tracks run in parallel rather than one after another, the total time becomes shorter than the sum of the individual parts. That is the whole idea of coordinating the process under one roof: that construction work and authority dialogue are as far advanced as possible when the battery lands.

Delivery, installation, and approval

When the modules arrive in Denmark, the foundation must be cured, the electrical panel in place, and the electrical installation prepared. Then the modules can be set up and connected.

What follows is a phase of installation, testing, and approval that takes about seven days as a planning estimate. It is not only about switching the system on. An electrical installation must be verified before it is taken into use, and that verification consists of an inspection, a test in which voltage is applied to the installation gradually, and a report. It is a safety process that must be completed before the system may legally be put into operation, and time is therefore set aside for testing and approval, not only for physical installation.

Once the system is tested and approved, it can go into operation. For a system of two or more modules in the turnkey process, this is also where access to the electricity market comes into play, which we facilitate through an aggregation partner. Go-live coincides with the second payment: the remaining 60 percent is paid at go-live. The milestones are thus directly linked to the payment model, the first at contract and order, the second at go-live.

Overall time horizon: why an interval, not a date

If the phases are added together, a typical process for two to three modules comes out at about 100 to 120 days. That is a planning interval, not a promise, and it is worth understanding why.

Several of the tracks have built-in variation. Production and transport of the battery is an estimate, and the same applies to the electrical panel, where delivery time can swing with demand. More important are the authority tracks: grid connection and building permit are independent processes whose duration neither we nor the customer can fix in advance. As long as they can be kept within the period when the battery is already in production and transport, they do not affect the total. If they drag on, they become the factor that extends the process. That applies especially if a case ends in physical grid reinforcement rather than an amended agreement on an existing connection, which is a rarer exception, but can push the process to the long end of the interval or beyond it.

Where the bottlenecks typically arise

The tracks that most often decide the timeline point to three bottlenecks in roughly this order.

The first is battery transport. Production and shipment of the modules is the longest continuous waiting period, and it falls outside what can be accelerated locally. That is why the order is placed immediately after the first payment.

The second is delivery of the electrical panel. Because a system of this size often requires a new electrical panel, and because there is national demand for that type of component, delivery time can become a factor in its own right. It is prepared early in the electrical track, so the component is in place when the rest of the installation is ready.

The third is the grid application and the building permit, which are the least controllable tracks, because the decisions rest with the grid company and the municipality. For the grid connection, 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 cases it is about an amended agreement on an existing connection. In exceptional cases a new connection point must be built, which requires excavation work, an excavation permit from the municipality, and consideration of other cable owners. The building permit is a similarly independent track, where it is the individual municipality that processes building permit applications and issues a building permit and can set local frameworks via a local plan (lokalplan).

That the grid track is hard to pin down in time is linked to pressure on the grid in these years. Electricity consumption and battery capacity are rising sharply, and grid companies invest as far as possible ahead of need, or as soon as a larger customer enters into a connection agreement, to avoid the distribution network becoming a bottleneck. For a timeline, that means the grid track should be treated as an estimate with real uncertainty.

What the company itself can do to keep the timeline short

Part of the timeline rests with us and our partners, but several of the factors that decide whether a process ends up at the short or the long end are with the company itself. Four things make a concrete difference.

• Early internal approval: Because the order can only happen after contract and first payment, the approval process with a CFO or board is often what determines the start date. The earlier that is completed, the sooner the clock can start counting.
• Early data: The size of the grid connection in amperes and a consumption profile that shows the real power peaks make it possible to move from dialogue to a concrete case without waiting time.
• Early site preparation: The sooner the placement is clarified, and it is confirmed that the system can be built legally at the address, the sooner the construction track and the authority dialogue can begin.
• Early grid dialogue: Because the grid track is the most variable, it pays to get it started early. A battery requires a connection that can both draw and feed electricity, and an existing delivery scope (leveringsomfang) is not in itself the same as capacity for a battery. That is only clarified by going to the grid company.

Across all four points, it is rarely the physical installation itself that delays a project, but the preconditions that were not in place when the process began.

ZynexGroup's approach to system assessment

We work from a phased timeline in which the parallel tracks are built in from the start, so that the battery's production and transport time is used to get construction, electrical work, and authority dialogue as far forward as possible. Our role is to coordinate those tracks under one roof and to be honest that some of them are estimates and not fixed dates.

Throughout the process, the company has one fixed contact person with us from the first enquiry, so that the same person keeps an overview of where the individual tracks are and what is waiting on what. We can control ordering, construction, and installation tightly and prepare the grid application and building case thoroughly, but we cannot guarantee a particular processing time at the grid company or the municipality. That is why we communicate the timeline as an interval with preconditions and update it as the uncertain tracks are clarified.

Limitations and preconditions

The interval of around 100 to 120 days assumes a typical process for two to three modules where the hard preconditions are in place: a sufficient grid connection and an address where the system can be built legally. If a precondition changes along the way, the timeline changes with it.

The single most important uncertainty is the grid connection. In most cases it is the processing of an amended agreement on an existing connection that decides the pace. If the grid in rarer cases must be reinforced with excavation work and new cables, the process can stretch markedly, and in individual cases a sufficient grid connection cannot be realised at all after a reasonable attempt. If that happens, the project may end after the contract, and payments are handled as agreed in the contract. There is therefore no universal guarantee that all amounts are always repaid in every situation; handling follows the specific contractual terms. The building permit carries a similar uncertainty if a local plan or local conditions come into play. Commissioning itself and the typical delays in infrastructure projects are covered separately in the guide, just as installation for production security, with backup power and critical loads, is described in its own track.

Overall perspective

A realistic timeline for an industrial BESS of two to three modules is not a single date, but an interval with preconditions. The clock starts at contract and first payment, and the battery's production and transport time is used to run battery, construction, and electrical work with grid and authorities in parallel, so the total becomes shorter than the sum of the phases. What can move the plan is especially grid and building permit: independent authority processes without a fixed processing time. A company that has internal approval, data, and site clarification in place early, and that gets the grid dialogue started straight away, has the best starting point for ending up at the short end.

Have the potential for your facility assessed

If you are considering an industrial BESS, a realistic timeline is one of the things that becomes concrete when a project gets underway. We use your grid connection in amperes, your consumption profile, and your historical consumption data for an initial assessment of whether there is a match, and for a data-based dialogue about the next steps, including how a timeline would realistically look for you. You are welcome to contact us here.