A notable shift is occurring within Southeast Europe’s renewable energy landscape, where a second investment cycle is emerging, particularly in the wind sector. Following a decade marked by substantial wind project deployment, especially in Romania and Bulgaria, many of the initial assets are now misaligned with contemporary technological advancements, evolving grid conditions, and fluctuating market dynamics.
The first generation of wind projects, primarily established between 2008 and 2015, utilized turbines in the 2–3 MW class and operated under different economic assumptions. This era was characterized by stable feed-in tariffs that supported consistent generation profiles. However, the current operational environment is defined by increased price volatility and grid constraints that necessitate enhanced flexibility.
Repowering stands out as a viable strategy to modernize these aging assets. By upgrading older turbines to newer models within the 5–7 MW range, developers can achieve output increases of 30–60% without requiring additional land or extensive permitting processes. This is particularly advantageous in regions like Dobrogea, where existing grid connections facilitate smoother transitions.
The capital expenditure (CAPEX) associated with repowering is significantly lower compared to greenfield projects, with costs typically ranging from €0.6–0.9 million per MW, as opposed to €1.2–1.5 million per MW for new installations. This reflects savings on land acquisition and permitting while also shortening construction timelines by approximately 30–40%, which allows for quicker capital recovery.
Beyond capacity enhancements, modern turbines provide improved capabilities for grid support, including advanced fault ride-through performance and reactive power control. These features are increasingly critical in Southeast Europe, where the stability of electrical grids faces challenges due to rising renewable penetration.
The integration of battery storage alongside repowered wind assets is gaining traction as a strategic trend. By incorporating storage capacity—typically between 20–50% of installed wind capacity—developers can transform traditional wind farms into flexible systems that can engage in balancing markets and reduce curtailment issues.
Romania is at the forefront of this transformation, boasting over 3 GW of installed wind capacity, much of which is nearing or surpassing ten years of operation. This positions Romania as a prime candidate for repowering initiatives as developers evaluate their portfolios for potential upgrades, especially where turbine performance has diminished or grid conditions have shifted.
Bulgaria presents a similar opportunity on a smaller scale, while Greece is beginning to consider repowering in specific areas where grid limitations or land constraints make optimization more appealing than expansion efforts.
In Serbia and Montenegro, where newer wind projects have been deployed more recently, the focus on repowering is still nascent; however, it is already influencing project designs. Current developments are being structured with future optimization possibilities in mind, including provisions for turbine upgrades and integration of energy storage solutions.
The concept of repowering offers a distinct risk-return profile relative to new developments. The existence of established infrastructure mitigates certain development risks while enhancing revenue potential through increased efficiency and output. Nevertheless, regulatory uncertainties surrounding permitting processes and grid access continue to pose significant challenges.
This emerging investment cycle holds considerable implications for the broader renewable energy market in Southeast Europe. It represents an alternative avenue for capacity growth that does not rely on new land acquisition or additional grid connections, potentially alleviating some regional constraints.
This evolution signifies a paradigm shift in how renewable assets are perceived; they are transitioning from static installations to dynamic systems capable of ongoing adaptation and optimization within an ever-changing energy landscape.
