IN Brief:
- CGES and Nu Energy have signed the transmission-grid connection agreement for the Velestovo solar project.
- The approximately €50 million development is intended to include battery energy storage alongside photovoltaic generation.
- Published capacity, storage duration, and detailed connection specifications remain outstanding.
Nu Energy has signed a grid-connection agreement with Montenegro’s transmission system operator CGES for the planned Velestovo solar project, establishing the formal route for the development to connect to the country’s high-voltage network. The scheme is valued at approximately €50 million and is intended to include battery energy storage alongside photovoltaic generation.
The agreement was signed by CGES general director Ivan Asanović and Nu Energy chief executive Erkut Alkaya. Public information released with the announcement does not give the photovoltaic plant’s MW rating, the battery’s MW or MWh capacity, its storage duration, or the detailed voltage and equipment configuration at the connection point.
That leaves several important engineering parameters unresolved, but the connection agreement itself marks a concrete development step. Utility-scale renewable projects require defined network access before their generation equipment can become useful operating assets, and the connection process determines how transformers, switchgear, protection, metering, controls, and export infrastructure will interface with the transmission system.
A project combining solar generation and storage creates a more complicated operating envelope than a conventional generating plant. The photovoltaic system exports according to available solar resource, while the battery can absorb or release power according to its state of charge, control strategy, and market or network instructions. Connection studies therefore need to consider credible import and export modes rather than only the solar plant’s peak generation.
The battery could potentially serve several functions, although Nu Energy and CGES have not specified the final operating model. Storage can absorb electricity during periods of high photovoltaic production and discharge later, reduce short-term changes in the project’s export profile, or provide balancing and ancillary services where market arrangements allow. The importance of each function depends heavily on storage duration and power rating, neither of which has yet been published.
Those missing figures will also shape the balance of plant. A battery intended primarily for rapid, short-duration grid services requires a different energy capacity and cycling profile from one designed to shift several hours of solar generation. Inverters, transformers, thermal systems, protection settings, auxiliary supplies, and control software all have to be selected around the expected duty rather than a generic BESS specification.
The project’s high-voltage interface will have to accommodate that flexibility without allowing the combined plant to breach its agreed connection limits. Plant-level controls can coordinate the solar and storage assets, limiting export when required and managing charging when network capacity or market conditions favour it. That type of control becomes increasingly important where renewable developments are connected to networks that were not originally designed for large volumes of variable generation.
Montenegro’s grid operator has been processing a growing pipeline of renewable connection requests, making the timing and configuration of new high-voltage infrastructure an increasingly important part of project delivery. Connection agreements do not remove the need for network studies, construction, protection coordination, commissioning, and compliance testing, but they define the electrical route around which those later stages can be developed.
For Velestovo, the €50 million project value gives an indication of scale without answering the more useful electrical questions. The eventual solar capacity will determine the generation profile presented to the system, while the BESS MW and MWh ratings will determine how much of that profile can be reshaped and for how long. Connection voltage, transformer capacity, and the point of connection will determine how the plant interacts with the surrounding network.
Nu Energy’s wider business includes photovoltaic generation, battery storage, energy management systems, and related infrastructure, giving the company a platform for developing Velestovo as an integrated asset rather than two unrelated installations. The practical test will come when those capabilities are translated into a defined plant configuration that can satisfy CGES requirements and proceed through procurement and construction.
The grid agreement therefore narrows the uncertainty around whether Velestovo has a route to the transmission system, but considerable technical detail is still to come. Published generation capacity, battery duration, connection voltage, equipment suppliers, and a construction timetable will show whether the development is principally a solar project with supporting storage or a more tightly integrated hybrid asset designed around both energy production and system flexibility.
