What does an industrial BESS cost?

One of the first questions we receive from Danish businesses is also one of the hardest to answer briefly: what does an industrial battery energy storage system actually cost? A battery energy storage system, often abbreviated BESS, is a facility that can store electricity and deliver it back to the grid or the business when it is most valuable. The price depends on several factors, which is why many suppliers avoid publishing concrete figures.

The purpose of this article is the opposite. We explain what the price typically covers, what a module costs, and which factors can push the price up or down. We do not give a final price, because that cannot be set seriously before we know your site and your grid connection. But we can make the pricing structure transparent, so it is clear what you are paying for, and why two systems of the same size can end up in different places on the price scale.

What the price covers

When we quote a price for an industrial BESS, we are not talking about the price of a battery in isolation. We are talking about a complete, turnkey project price. As a starting point, it covers:

• Battery modules: the storage capacity and the power output.
• Electrical panel and electrical work: adaptation and connection to the facility's electrical installation.
• Contractor work: foundations, installation, and the physical work on site.
• IoT, communication, and metering: the hardware that makes it possible to monitor and control the system.
• Setup, integration, and project coordination: planning, commissioning, and overall project management.

The reason we combine everything into one price is practical. A BESS requires coordination between the supplier, the electrical contractor, the civil contractor, and the local distribution system operator (the company that owns the local electricity grid). If that coordination sits with the customer, the project often becomes both more expensive and less certain. By consolidating responsibility, you get one price and one party accountable for making the parts work together.

That the battery is only one part of the total price is not specific to ZynexGroup. International assessments of how the cost of a battery storage system is composed show that the installed price is built from battery cells, inverter, and a range of other components as well as the installation itself, as reflected in NREL's cost model for battery storage. Reviews of actual projects also indicate that installation and grid connection are among the most variable costs from project to project, as described in Ember Energy's analysis of battery prices. That is the main reason a precise price cannot be given before the specific site is known. The same basic components appear across markets, which is also reflected in the IEA's review of batteries in the energy system.

Price per module, and why one module rarely stands alone

Our current standard module has a capacity of 261 kWh and a power rating of 125 kW. Capacity in kWh indicates how much energy the system can store, while power in kW indicates how quickly it can charge and discharge. Both matter for what the system can be used for, and therefore for which size fits your consumption. A single installed module typically sits around 396,000 DKK excluding VAT. All prices in this article are excluding VAT, unless otherwise agreed in a specific quotation.

In practice, we rarely install only one module. That is a matter of both economics and operations. A large share of the costs of a system, for example installation, connection, and project work, do not scale down linearly. A small system therefore carries relatively more fixed costs per kWh than a somewhat larger one. For that reason, most commercial customers start at two to three modules:

• Two modules: 522 kWh / 250 kW, approximately 792,000 DKK.
• Three modules: 783 kWh / 375 kW, approximately 1,188,000 DKK.

There is no fixed upper limit on how large a system can be. Size depends on consumption, on your site, and on what makes commercial sense. The aim is not the cheapest possible battery, but the smallest solution that is economically sound for both parties.

What can move the price

Two systems with the same number of modules can end up with different prices. The difference almost always lies in the conditions around the system, not in the battery itself. The following items are the typical causes.

Site and electrical panel. A central question is whether the existing panel has sufficient capacity, or whether it needs to be upgraded. Another is the distance from the system to the connection point, because long cable runs and excavation work cost money. If there is good space close to the connection point, installation becomes simpler and cheaper.

Grid connection. This is where the greatest uncertainty often sits. Whether a system can be connected quickly and cheaply, or whether it requires reinforcement of the grid, depends on how much spare capacity there is in the local electricity grid at your exact address. The process that Danish distribution system operators follow is described in Green Power Denmark's material on connection to the distribution grid. For battery systems, the distribution system operator determines the connection point after a concrete technical assessment, as described by Cerius. A system of 250 to 375 kW typically falls in the distribution operators' mid-tier category for connection. That involves more technical documentation and an actual connection agreement than for a small system, but less than for a large industrial park, and the scope depends on the individual operator and the specific location. A connection contribution is also payable, and its size depends on capacity and local conditions, as explained by N1. Concrete amounts cannot be stated in general, because they vary between operators and over time, and because they are set on a case-by-case basis.

Fire safety requirements. Fire safety requirements can affect both placement and installation. For larger storages of lithium-ion batteries, there is an official Danish fire safety guidance from the Danish Emergency Management Agency (Beredskabsstyrelsen), which among other things works with a threshold around 2,000 kWh for larger storages. A system of two to three modules sits below that threshold, but fire conditions are always assessed concretely based on placement and surroundings. Denmark does not yet have a common, mandatory test standard for battery systems, and fire safety is therefore assessed case by case, as reviewed in an analysis of the Danish guidance documents from DBI.

Electrical installation and insurance. All electrical work must be carried out by an authorised electrical contractor, and electrical installations are subject to supervision by the Danish Safety Technology Authority (Sikkerhedsstyrelsen). This is not an optional line item, but a prerequisite for a lawful installation. Insurance of the system is a project point that must be clarified as part of the project, but that is handled concretely from case to case.

Backup power. Backup power, STS (static transfer switch), and reserved backup capacity are not part of the standard model. If those functions are wanted, they are an optional add-on that requires separate technical design, and that can affect both the price and the capacity available for commercial operation.

What the price does not necessarily cover

Certain items may fall outside the standard price, because they depend on conditions we do not know in advance. That includes, among other things, major upgrades of the existing electrical installation, extensive excavation work, reinforcement of the grid if there is no spare capacity, and add-ons such as backup power. We mention them openly, because it is precisely here that a price can change most from one address to another.

Why we do not give a fixed price in advance

The point of explaining the items above is not to make the price opaque. It is to show why a serious price requires that we know your concrete conditions. A system where spare grid capacity is available nearby, and where the panel has room, costs less to bring into operation than an equivalent system where the grid must be reinforced and where long excavation is required. That variation is real and documented, not a negotiation tactic.

We therefore work with a price level per module as a starting point and add the concrete site and connection conditions on top. In that way, it becomes visible what is standard and what is specific to your address.

We prefer to state a module-level figure and explain the factors that can move the price, rather than promise a low number that later has to be adjusted upward. A cost estimate that does not account for grid connection and site is not a reliable figure. Openness about the range is more useful for a finance decision-maker than an optimistic starting point.

ZynexGroup's approach to system assessment

When we assess the price for a specific facility, we start from a few pieces of information: your grid connection, your consumption profile, and preferably historical consumption data. With that data, we can have a data-based discussion of whether there is a match, and what a system would realistically cost to establish at your site. We use the information for an initial assessment, not to promise a particular outcome in advance.

Overall perspective

The price of an industrial BESS consists of a module level that is easy to understand, and a set of site-specific conditions that determine the rest. A single module of 261 kWh / 125 kW sits around 396,000 DKK excluding VAT, and most start at two to three modules. Whether the final price lands high or low is decided first and foremost by grid connection, site, and any add-ons. The more concrete information we have, the more precisely we can answer, and the less the price becomes a guess.

Get the price assessed for your facility

If you want a realistic picture of what a system would cost at your site, you can contact us. With information about grid connection and consumption, we can have an initial, data-based discussion of whether there is a match for your specific facility.