Southeast Europe’s renewable investment market is increasingly splitting between projects with secured grid access and those still waiting for a connection, making transmission capacity a more valuable development asset as the cost of solar panels and batteries continues to decline.
Montenegro offers a recent example of this shift. Transmission system operator CGES signed a connection agreement with Nu Energy for the planned Velestovo solar project near Cetinje, which is expected to combine up to 60 MWp of solar capacity with a 50 MW/100 MWh battery system. Total investment is estimated at around €50 million.
The connection agreement does not by itself complete the project’s development or financing, but it removes one of the most significant uncertainties facing renewable developers: whether the electricity network has sufficient capacity to accommodate the project’s output.
Across Southeast Europe, that question is becoming increasingly difficult as renewable project pipelines expand faster than transmission infrastructure.
Serbia changed its regulations in May, stipulating that connection studies for a large group of new variable renewable projects already in the development queue will not be processed until a window running from September 1, 2029, to December 31, 2029, replacing an earlier timetable that envisaged processing during 2026.
The Renewable Energy Sources of Serbia association said the change effectively freezes the early development process for affected projects because a grid study represents a critical step toward securing a connection.
As a result, projects that already hold advanced connection rights, or fall under regulatory categories treated differently, are gaining an increasingly valuable position within the renewable development pipeline.
The result is the emergence of a two-tier renewable investment market. A developer can secure land, complete wind measurements, obtain environmental approvals, negotiate with equipment suppliers and identify potential lenders, yet still lack a commercially viable project without a credible route to the grid.
Conversely, a project with established transmission access can become significantly more attractive even before construction begins.
Other countries in the region are responding by increasing investment in network infrastructure rather than restricting renewable development. Slovenia, for example, increased the funding available through its Modernisation Fund programme for transmission and distribution projects to approximately €58.66 million in August. A separate programme is making another €69 million available for smart-grid investment through 2030.
These programmes are designed in part to strengthen the network’s ability to accommodate renewable generation, energy storage, electric vehicles and other emerging electricity demand.
The broader challenge reflects a fundamental mismatch between renewable and grid-development timelines.
Solar projects can often be developed and constructed relatively quickly once land, permits and financing are secured. Battery systems can be deployed even faster. Major transmission substations and high-voltage lines, however, can require years of system studies, planning approvals, land acquisition, environmental procedures and construction.
As a result, renewable capacity can expand faster than the infrastructure needed to connect it.
Energy storage can partially ease the problem but cannot eliminate the underlying grid constraint. Batteries can reduce export peaks, provide balancing services and shift renewable production into higher-value hours, potentially improving the overall system value of a project.
However, storage itself still requires a grid connection capable of importing and exporting electricity.
This is changing the hierarchy of assets that renewable developers compete for. Five years ago, the primary advantages were often strong solar or wind resources, suitable land and declining equipment costs. Today, developers are increasingly competing for grid positions, balancing capability and credible energisation dates.
The change also has important implications for financing and project acquisitions. Banks are likely to place greater emphasis on the maturity and certainty of a project’s grid agreement before committing capital. Investors acquiring renewable development pipelines will increasingly distinguish between nominal megawatts under development and megawatts supported by secured connection rights.
The difference could become particularly significant in Serbia, where the delay in processing connection studies until late 2029 may leave projects with advanced grid positions carrying a growing scarcity premium.
Montenegro’s Velestovo project illustrates the opposite side of the same market dynamic. Solar modules and battery systems can ultimately be sourced from a competitive international equipment market, with developers able to compare suppliers and technologies.
A connection to the high-voltage grid, however, cannot simply be procured from the global market.
As renewable capacity continues to expand across Southeast Europe, grid access is therefore becoming one of the region’s most valuable energy-development assets. The next stage of the renewable transition will depend not only on how quickly developers can build generation, but on how quickly electricity networks can make room for it.
