Battery Energy Storage Systems at Solaris X:
Three tailor-made solutions

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The right battery storage system — derived from your goals

Solaris X does not design battery storage systems “off the shelf.” We start with your requirements and objectives, then assess the site conditions, your plans, and the intended layout. Based on this, we define the right use case together with you. Solaris X reliably delivers battery storage systems across all three variants — engineered with technical precision, economically sound, and aligned with your available space, layout, and operating model.

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Stand-alone battery energy storage systems

Stand-alone BESS have their own grid connection and operate independently of generation assets such as solar PV or wind. They are particularly suitable when the storage system is intended to be used flexibly in the power market — for example, charging when prices are low and discharging when prices are high, or providing services to stabilize the grid. The key advantage: the battery storage system is not tied to a specific generation plant and can therefore be operated and commercialized with maximum flexibility.

Planning note: For stand-alone projects, grid operators often review the grid connection especially closely. The reason is that, depending on the operating strategy, a battery storage system can both draw and feed in high power — and this must be fully aligned with the grid, protection systems, and metering. As a result, permitting and grid-connection processes may take longer, depending on the responsible parties and the region.

Co-located battery storage systems (e.g., PV or wind + storage)

For battery storage systems connected to a generation asset (co-located), infrastructure and the grid connection are shared. The storage system absorbs surplus electricity that would otherwise be curtailed or exported at unfavorable times. This helps make better use of renewable energy and shift feed-in to more advantageous periods. In many cases, this improves project economics because the existing grid connection capacity can be utilized more effectively.

Especially when an asset is already operating on site, implementation can often progress faster: the grid connection, metering concept, and many technical fundamentals are already in place and “only” need to be expanded in a sensible way. In addition, storage systems combined with renewable generation typically benefit from the legal priority given to electricity from renewable sources. This can simplify coordination with the relevant authorities — although timelines still depend on the local grid operator and permitting authority.

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Behind-the-meter / on-site storage (industrial & commercial)

These battery storage systems are installed directly at industrial or commercial facilities — “behind the meter.” The focus is on optimizing self-consumption: self-generated electricity can be stored and then used exactly when the business needs it. These systems are not automatically tied to grid electricity. They can also be charged directly with power from existing on-site PV or wind assets and, if needed, additionally use grid electricity — depending on objectives, operating concept, and the power supply contract. This can increase self-consumption and profitability, reduce peak loads, and improve security of supply.

Support with applications and approval processes (optional)

Regardless of which of the three scenarios best fits your project, we can also support you with application, coordination, and approval processes upon request.
Based on many years of collaboration with grid operators, we assist you with preparing, structuring, and coordinating documentation, as well as communication with the responsible stakeholders and authorities.
Solaris X remains your central point of contact and takes overall responsibility for project coordination — from planning and implementation through to commercialization.

Our Partners

We work with specialized partners to deliver battery storage projects end-to-end — from project development and technical documentation to intelligent operations management. This allows us to strategically complement our EPC services with additional expertise, ensuring clear processes, reliable results, and maximum execution certainty.

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