A significant transformation is underway in Southeast Europe’s renewable energy landscape, as the region embarks on a second investment cycle focused on repowering existing wind assets. Following over a decade of initial deployment, particularly in Romania and Bulgaria, many early-generation wind projects are now misaligned with contemporary technological advancements and market dynamics.
The first wave of wind installations, primarily developed between 2008 and 2015, utilized turbines in the 2–3 MW class with less advanced control systems. These projects were constructed under assumptions that have since changed, as the current energy environment is marked by price volatility and grid constraints that demand greater operational flexibility.
Repowering presents a viable solution to adapt these aging assets to modern standards. By upgrading to new turbines in the 5–7 MW range, developers can achieve output increases of 30–60% without necessitating additional land use or extensive permitting processes. This approach is particularly advantageous in regions like Dobrogea, where existing grid connections facilitate smoother transitions.
The capital expenditure (CAPEX) profile for repowering differs significantly from that of greenfield projects. Typical costs for repowering range from €0.6–0.9 million per MW, compared to €1.2–1.5 million per MW for new developments. This cost advantage stems from reduced expenses related to land acquisition and permitting, as well as shorter construction timelines—often cut by 30–40%, leading to quicker returns on investment.
Beyond capacity enhancements, modern turbines provide improved grid support capabilities, including enhanced fault ride-through performance and reactive power control. These features are increasingly critical in Southeast Europe, where rising renewable penetration poses challenges to grid stability.
An emerging trend within this repowering initiative is the integration of battery storage systems. By incorporating storage capacity equivalent to 20–50% of installed wind capacity, developers can convert legacy assets into flexible generation systems that participate in balancing markets and reduce curtailment risks.
Romania is at the forefront of this transition, boasting over 3 GW of installed wind capacity, much of which is nearing or surpassing ten years of operation. This positions Romania as a key player in the regional repowering landscape, with developers actively evaluating portfolios for upgrade opportunities where turbine efficiency has diminished or grid conditions have evolved.
Bulgaria offers a similar, albeit smaller-scale opportunity for repowering initiatives. Meanwhile, Greece is beginning to explore repowering options in specific areas where grid limitations or land constraints make optimization more appealing than expansion.
In Serbia and Montenegro, where wind deployments are more recent, the concept of repowering is already shaping project designs. New installations are being developed with future optimization considerations, including plans for turbine upgrades and storage integration.
The shift towards repowering alters the risk-return profile for stakeholders compared to greenfield development. Existing infrastructure mitigates development risks while enhancing revenue potential through increased efficiency and output. However, regulatory uncertainty surrounding permitting and grid access continues to pose challenges for investors.
This second investment cycle marks a pivotal moment for Southeast Europe’s renewable market, introducing a fresh avenue for capacity growth that does not rely on new land or grid connections. It signifies a broader shift in how renewable assets are perceived—from static installations to dynamic systems capable of ongoing adaptation and optimization in response to an evolving energy landscape.
