Recent analyses of Serbia’s energy landscape reveal significant advantages of onshore wind over solar power, particularly as project scales increase. A 400–600 MW wind portfolio exhibits distinct operational characteristics that enhance generation stability and investor returns, especially under conditions of grid stress and delays.
Onshore wind in Serbia achieves capacity factors between 32% and 38%, markedly higher than those of utility-scale solar installations. A 400 MW wind project can generate approximately 1,120–1,330 GWh annually, while a 600 MW setup can produce between 1,680–2,000 GWh. This efficiency allows a smaller footprint to contribute significantly to the overall electricity supply without overwhelming the grid during peak hours.
The variability in wind generation leads to higher capture prices. Wind energy is less correlated across different times of day and seasons, aligning more closely with demand peaks during evenings and winter months when prices are typically elevated. Consequently, wind capture prices are generally 5% to 15% above those for solar at similar penetration rates. Realized prices for wind can range from €70 to €90/MWh under various contracts, with long-term merchant prices clustering around €75 to €100/MWh, exhibiting less volatility compared to solar.
This translates into substantial revenue potential. A 400 MW wind farm could generate annual revenues between €85 million and €115 million. Expanding capacity to 600 MW could elevate this figure to approximately €130 million to €180 million, maintaining robust revenue streams even as additional capacity is integrated into the system. This resilience stems from the dispersed output of wind farms compared to the concentrated generation patterns seen in solar installations.
While onshore wind entails higher capital expenditures per unit than solar, it compensates by providing more usable energy and imposing lower grid strain. The costs for developing onshore wind projects in Serbia typically range from €1.20 million to €1.80 million per MW, influenced by factors such as terrain and proximity to high-voltage lines. For projects incorporating storage solutions, battery systems priced at €0.35 million to €0.55 million per MWh contribute to total CAPEX estimates of approximately €480 million to €720 million for a 400 MW project without storage and between €900 million and €1.3 billion for a storage-intensive configuration at 600 MW.
The structural differences in grid integration highlight the advantages of wind over solar. Solar energy tends to create sharp midday peaks that can depress market prices and lead to abrupt ramping requirements later in the day. In contrast, the stochastic nature of wind generation mitigates these issues by distributing output more evenly across time and geography. Additionally, modern turbines enhance grid stability by providing reactive power support and synthetic inertia.
Curtailment behavior further underscores these benefits. In well-placed Serbian wind portfolios, curtailment rates are generally low—estimated at around 1% to 2% for a 400 MW setup—rising only slightly with increased capacity but remaining manageable with additional storage options. This contrasts sharply with larger solar arrays which may face curtailment rates of 8% to 10%, potentially leading to significant operational inefficiencies.
The impact on equity returns is pronounced. Unlevered internal rates of return (IRRs) for a storage-light 400 MW wind portfolio typically range from 8% to 10%. Scaling up to a storage-heavy configuration at 600 MW can support IRRs between 9% and 12%, showing a tighter risk distribution compared with equivalent solar projects that often yield returns between 6% and 9% but carry greater downside risks due to curtailment issues.
Stress tests related to delays in commissioning demonstrate that while postponing the activation of 200 MW of wind capacity could defer up to €95 million in revenue due to lost generation, the impact on equity IRR is comparatively modest—typically affecting returns by only about 80–150 basis points versus the larger impacts seen in delayed solar projects.
The role of storage differs fundamentally between the two technologies. For wind projects, storage is not essential for financial viability; rather, it serves as an enhancement tool that offers additional flexibility rather than acting as a safeguard against value loss as seen in solar applications where it often prevents significant revenue declines.
A comprehensive assessment indicates that a well-executed onshore wind platform in Serbia not only provides greater resilience compared with similarly sized solar developments but also enhances overall system stability. The distinct operational characteristics of wind energy—such as higher capacity factors and lower curtailment rates—position it favorably within Serbia’s evolving energy framework. As such, differentiating these technologies within financial models is crucial for accurate risk assessment and investment strategy formulation moving forward.
