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Unlock more value from your grid connection

Shared Connection: Flexibility trading at a shared grid connection point

A grid connection is often the limiting factor for new energy projects.

In a Shared Connection setup — a shared grid connection point — multiple energy systems use the same grid connection, for example a PV system, a battery storage system, and on-site loads. Normally, the combined power of these systems would exceed the available grid connection capacity. This is exactly where TESVOLT Energy ’s intelligent control comes in. It dynamically manages the battery storage system to ensure that the grid connection always remains within permitted limits — automatically and in the background.

For operators, this means:

  • greater economic value from existing infrastructure
  • additional revenue through energy trading
  • better utilization of the grid connection
  • reduced technical and regulatory complexity

Planning a shared connection project?

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Shared Connection explained simply: an example

The grid connection point allows a maximum power of 300 kVA — both when feeding electricity into the grid and when drawing electricity from the grid.

The site includes: a PV system with 200 kW, a battery storage system (BESS) with 180 kW and its own meter, as well as a load with 150 kW power.

Problem 1: Feeding electricity into the grid

If the PV system generates a lot of electricity while the battery storage system is discharging at the same time, the permitted grid connection capacity can be exceeded.

200 kW (PV) +
180 kW (BESS)
= 380 kW

This would exceed the permitted limit of 300 kVA.

Problem 2: Drawing electricity from the grid

A problem can also occur while charging the battery storage system. If the on-site loads require 150 kW and the battery is charging at the same time:

150 kW (load) +
180 kW (BESS charging)
= 330 kW

This also exceeds the permitted grid connection capacity of 300 kVA.

The solution lies in intelligent management of the available power capacity — separately for feed-in and grid consumption.

TESVOLT Energy uses weather and generation forecasts to predict how much grid capacity the PV system will require. The battery storage system automatically uses only the free capacity that is currently available.

lots of sunshine → PV system gets priority
little sunshine → battery storage can use more capacity

This ensures that the grid connection always remains within the permitted limits.

No additional complexity for the customer

TESVOLT Energy handles the entire technical control process in the background:

  • PV forecasting
  • dynamic power limits
  • grid operator compliance
  • EMS integration
  • trading logic

For the operator, it remains simple:

  • one contract
  • one reporting system
  • one dashboard
  • one point of contact

When is a shared connection a suitable solution?

  • PV generation system and battery storage connected to a shared grid connection point
  • The combined installed capacity exceeds the capacity of the grid connection point
  • Additional loads or storage systems are operated on-site behind separate meters
  • The battery storage system has its own meter and is intended to participate in front-of-meter energy trading (not only self-consumption optimization)
Will the PV system’s direct marketing performance be limited by the shared connection?

No — PV feed-in always has priority. The PV forecast determines how much grid capacity remains available for the BESS. Based on this, the BESS feed-in is dynamically reduced if necessary — not the other way around. If a different prioritization is required (e.g. BESS priority), this can be configured on a project-specific basis.

What happens if the PV forecast is inaccurate?

The EMS continuously compares the actual values at the grid connection point with the defined operating limits in real time. If deviations occur, the available BESS power is automatically reduced and corresponding feedback is sent to the aggregation platform. This ensures that the grid connection limit is never exceeded.

Can loads also be considered dynamically — not just statically?

TESVOLT Energy currently works with a static offset for loads in grid consumption mode. Dynamic consideration (e.g. based on load forecasts) is a possible future enhancement, but it does not simplify the core product concept: the static approach is robust, verifiable for the grid operator, and sufficient for the vast majority of sites.

How does the shared connection differ from a stand-alone solution?

From the customer’s perspective: almost no difference. Contract structure, reporting, and billing remain the same. The difference lies entirely in the internal complexity managed by TESVOLT Energy: dynamic operating limits, PV forecast integration, and static reservation for grid consumption. Customers benefit from the same multi-trader setup and the same level of transparency.

What data does TESVOLT Energy require for a shared connection setup?

For the PV forecast: AC/DC power of the PV system, orientation, tilt angle, location, and, if available, specific annual yield and feed-in profile.

For the loads: static grid consumption capacity (reserved capacity).

For the grid connection point: permitted active power at the connection point and, if applicable, grid-operator-specific operating limits.

What is the difference between shared connection and co-location?

Shared Connection vs. Green Power Storage in a Classic Co-Location Setup
At first glance, the concepts appear similar — in both cases, PV and BESS are located at the same site. The key difference, however, lies in the trading logic and the operational freedom of the storage system:

A green power storage system in a classic co-location setup is an EEG-compliant storage system: it may only charge from the PV system (or other renewable energy sources). Charging from the grid is either prohibited or heavily restricted by regulation. As a result, trading flexibility is fundamentally limited: charging is only possible during PV generation → no overnight spreads, lower cycle counts, and complex EEG compliance requirements. The storage system primarily serves as a PV revenue optimizer — not as an independent flexibility asset.

A front-of-the-meter storage system in a shared connection setup, by contrast, is a fully flexible grid-charged storage system: it can charge from and feed into the grid at any time. The only limitation comes from the available grid capacity at the shared grid connection point — not from regulatory restrictions on storage operation. This enables full trading flexibility (day-ahead, intraday, and potentially ancillary services markets), multi-trader optimization, and no EEG compliance regime for storage operation.

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