Fortis Energy is progressing with a significant utility-scale solar and battery storage initiative in northern Serbia, which is garnering increased interest from lenders and infrastructure investors focused on the evolving carbon-driven power market in Southeast Europe.
This project, situated near Sremska Mitrovica, is designed as a multi-phase hybrid complex that will integrate up to 270 MW of solar capacity with approximately 72 MWh of battery storage. The initial phase includes 90 MW of solar paired with 36 MWh of storage, with a total grid connection capacity estimated at around 180 MW AC, making it one of the largest integrated solar-battery developments in the region.
Industry participants highlight that the project’s substantial scale and hybrid configuration significantly enhance its financing attractiveness, particularly as power markets in Southeast Europe face increased volatility linked to carbon pricing and adjustments in cross-border trading.
The full build-out of the facility is projected to generate over 365 GWh annually, potentially yielding revenues between €30 million and €45 million based on current regional baseload prices ranging from €80 to €120 per MWh. In tighter market conditions, revenues could increase to between €50 million and €60 million.
A key component of the project’s investment rationale is the inclusion of battery energy storage, which facilitates peak shifting and intraday arbitrage. This capability enables operators to capitalize on price spreads that can vary significantly throughout a trading day, often reaching between €30 and €80 per MWh.
Traders in the region point out that the divergence between EU carbon-priced markets and non-EU systems is a major factor contributing to these price spreads. With EU ETS prices hovering around €70 to €90 per ton of CO₂, thermal generation costs within the EU have surged by an estimated €55 to €85 per MWh, while Balkan systems continue to operate with minimal carbon cost integration.
This situation has resulted in persistent cross-border price differentials of €20 to €60 per MWh, with peaks exceeding €80 per MWh during tight supply periods or low renewable output. Such dynamics underscore the demand for flexible assets capable of optimizing dispatch. Additionally, battery storage enhances grid compliance and mitigates curtailment risks, particularly as solar capacity increases in northern Serbia amid tightening transmission constraints.
The anticipated investment for this project ranges from €220 million to €285 million, based on regional benchmarks estimating costs between €0.55 million and €0.75 million per MW for solar installations and between €350 and €500 per kWh for battery systems. Ongoing discussions with international financial institutions suggest potential involvement from multilateral lenders, which could stabilize the financing structure and support longer tenors.
This participation would likely provide additional reassurance to commercial banks operating in a market characterized by significant merchant exposure and developing long-term power purchase agreements. Debt structuring for similar projects typically encompasses 65% to 75% of total capital expenditure (CAPEX), with financing terms extending up to 15 years depending on revenue predictability and hedging strategies.
Unlike conventional solar projects, Fortis’s initiative is set to leverage a broad revenue framework that includes sales from day-ahead markets, intraday trading, ancillary services, and potential bilateral agreements with industrial consumers. There is growing interest from energy-intensive sectors seeking access to low-carbon electricity as carbon border adjustments start impacting export competitiveness.
The role of battery storage will be crucial in capturing intraday price fluctuations that have intensified alongside increasing renewable energy integration in EU markets. Price variations ranging from €50 to €100 per MWh within a single day are becoming more frequent, presenting additional revenue opportunities for adaptable generation assets.
The introduction of carbon border pricing is also influencing the project’s economic landscape by altering cross-border electricity flow dynamics. Coal-based generation in Southeast Europe typically costs between €50 and €60 per MWh but becomes less competitive when adjusted for carbon costs akin to EU levels, raising effective costs to approximately €110–140 per MWh. This shift diminishes the viability of traditional export-driven trading models while enhancing the value proposition for renewable energy sources compliant with carbon regulations.
Market analysts estimate that up to 60% to 70% of current regional electricity export volumes may face margin compression under full carbon cost alignment, possibly resulting in an annual reduction of 8–10 TWh in cross-border electricity flows. Consequently, hybrid renewable projects are increasingly recognized as strategic assets essential for maintaining access to EU-linked markets.
Equity investors are anticipated to target returns ranging from 10% to 13% internal rate of return (IRR) under standard scenarios, potentially increasing to 14%–18% through gains derived from intraday trading and favorable price spreads. Conversely, downside risks such as heightened curtailment or price compression could reduce returns to between 8% and 10%, although battery integration is expected to alleviate some risks associated with these factors.
Grid constraints remain a critical consideration in northern Serbia due to rapid renewable energy expansion testing transmission capacities; however, the project’s storage component coupled with its secured grid connection should limit exposure.
The Fortis initiative exemplifies a broader transition within Southeast Europe’s power markets where value increasingly hinges on flexibility, carbon positioning, and trading capabilities rather than solely on generation costs. As carbon pricing continues reshaping regional pricing structures, hybrid solar-plus-storage projects are emerging as favored investment models that offer both stable generation and opportunities for market-driven gains.
