As Serbia progresses in its energy transition, the focus remains predominantly on megawatts (MW), overshadowing the more critical metric of terawatt-hours (TWh). This emphasis on capacity rather than actual deliverable energy creates a misleading narrative for exporters, particularly those subject to the EU’s Carbon Border Adjustment Mechanism (CBAM). The core issue lies in the distinction between installed capacity and usable energy. Under CBAM, competitiveness hinges on the amount of verifiable, deliverable green electricity that can be supplied to industrial buyers throughout the year, rather than mere capacity figures.
The reliance on MW as a primary metric obscures important operational realities. For instance, a 1,000 MW solar portfolio in Serbia, with a capacity factor of 17–19%, generates approximately 1.5–1.7 TWh annually under optimal conditions. In contrast, a 600 MW wind portfolio operating at 32–38% can yield similar or even greater annual output. However, the public perception often favors solar due to its higher MW figures, which do not reflect actual energy delivery capabilities critical for exporters facing CBAM compliance.
This discrepancy extends beyond volume to timing and shape of energy production. Solar energy is primarily generated during midday hours, while wind energy is produced more evenly across various times and seasons. Consequently, two portfolios may yield identical annual TWh but differ significantly in economic value based on when the energy is available for consumption. Thus, understanding TWh metrics becomes essential for aligning supply with demand effectively.
For industries affected by CBAM—such as aluminium processing and steel manufacturing—the shape of electricity supply is just as crucial as its volume. A strategy that provides substantial daytime output but little at night could lead to additional costs for buyers who must manage their energy procurement more complexly. As such, industrial procurement teams are increasingly prioritizing questions about usable MWh delivery aligned with their operational load profiles rather than focusing solely on MW capacity.
Curtailment issues further complicate the MW-centric approach. In scenarios where installed capacity exceeds grid flexibility—such as solar-heavy portfolios—curtailment rates can reach 5–10%. For example, a 1.6 TWh solar project losing 8% of its output results in only 1.47 TWh of eligible green electricity delivered. This shortfall translates into significant financial losses and compliance challenges for exporters relying on these figures for CBAM adherence.
The challenges extend to grid dynamics as well. Transmission systems do not uniformly accommodate capacity; they handle energy flows over time. A cluster of projects totaling 500 MW may appear manageable but can overwhelm specific nodes during peak times, leading to curtailments or export limitations. Therefore, from an industrial buyer’s perspective, the real concern is whether contracted green electricity is reliably delivered rather than just existing within the system’s capacity limits.
Moreover, public targets framed in MW fail to provide insight into how these translate into usable TWh for industries. Two countries with identical MW goals can experience vastly different outcomes based on factors such as capacity utilization and curtailment policies. This lack of clarity contributes to an inflated sense of progress within Serbia’s renewable sector.
From an investment standpoint, focusing solely on MW can obscure return risks associated with projects where delivered MWh and market capture prices significantly impact overall economic viability. Projects that boast low installation costs but suffer from high curtailment rates or poor pricing are not necessarily cost-effective when considered from an industrial buyer’s perspective.
The confusion between MW and TWh also influences technology adoption. While solar projects dominate capacity installations due to easier scalability in MW terms, wind projects often deliver superior TWh per installed MW owing to better performance characteristics under CBAM requirements. This bias towards solar could lead to missed opportunities where wind would provide more reliable energy outputs per euro invested.
Storage solutions are frequently touted as a means to bridge the gap between MW and TWh; however, they do not generate new energy but merely shift it across time periods. While storage can enhance reliability by mitigating curtailment effects, it incurs capital costs that must be justified through preserved TWh values. When integrated into poorly designed portfolios focused on MW rather than TWh deliverability, storage may simply compensate for foundational design flaws rather than enhance overall efficiency.
The aggregation of renewable resources further highlights this issue; what truly matters at scale is not how many MW are installed but how many MWh can be consistently delivered through contracts. Aggregators typically trade in TWh blocks rather than nameplate capacities—a shift increasingly mirrored by industrial buyers seeking reliable annual volumes and consistent seasonal profiles over simplistic capacity metrics.
The implementation of CBAM accelerates this necessary transition by tying emissions accounting directly to actual delivered energy rather than theoretical capacities. EU buyers will increasingly demand proof of delivered TWh with verifiable origins instead of accepting mere promises based on existing MW figures. As a result, Serbian exporters face growing scrutiny regarding their ability to meet these evolving standards amidst insufficient national data reporting frameworks.
A strategic timing concern also arises: while installing new MW can occur rapidly, delivering corresponding TWh takes longer due to grid constraints and commissioning delays. Early operational years often fall short of projected outputs relative to nameplate expectations—critical years for exporters facing immediate procurement decisions and supplier evaluations based on actual performance metrics rather than theoretical capacities alone.
The ongoing focus on MW could lead Serbia to misjudge its readiness for decarbonization while underestimating compliance challenges facing exporters under stricter EU regulations. This misalignment may result in rushed responses and inflated costs that become apparent only when faced with pushback from EU buyers—by which point negotiating power diminishes significantly.
The solution requires a significant reframing: Serbia’s energy transition metrics must shift towards quantifying TWh deliverability under realistic stress conditions. Future targets should clearly articulate expected volumes of green electricity available for industry while accounting for factors like curtailment and grid readiness comprehensively. Evaluating technology options based on their contribution in terms of TWh per euro spent—and factoring in grid impact—will be essential moving forward.
For exporters navigating CBAM regulations effectively, this reframing will alter procurement strategies immediately; instead of focusing solely on low-cost MW installations, there will be an emphasis on securing portfolios capable of delivering reliable annual volumes within defined tolerance levels and replacement mechanisms when necessary. While solar will continue to play a role in Serbia’s renewable landscape, wind-anchored aggregated portfolios will likely gain favor due to their enhanced reliability without compromising overall delivery capabilities.
The overarching takeaway is clear: Serbia’s success in its energy transition will depend less on megawatt installations and more on its ability to provide credible terawatt-hour deliveries tailored precisely for industrial clients’ needs at optimal times with assured reliability under evolving regulatory frameworks such as CBAM.
