Buk Bijela accelerates—turning Montenegro into the region’s ESG and legal stress test

As Serbia and Republika Srpska press forward on the Buk Bijela hydropower project, Montenegro finds itself exposed to decisions it says it will not join—despite having potentially significant environmental stakes. The effort, linked to a broader cascade on the Drina River, is now moving again even as investors face a familiar Southeast Europe challenge: how to reconcile energy security ambitions with ESG risk and unresolved legal questions.

The latest push centers on Buk Bijela hydropower project, a cross-border development planned for the upper Drina River near the Montenegro border. Buk Bijela is being developed jointly by Serbia and Republika Srpska through a dedicated entity under the “Upper Drina Hydropower System,” with total investment estimated at more than €200 million. Financing is expected to come from utilities of both entities, with potential involvement of Chinese-backed funding structures.

A plant designed for others’ grids—while Montenegro watches

Buk Bijela’s location places it close to Montenegro’s frontier, but its operating logic does not include supplying electricity into Montenegro’s system. Project documentation and expert analysis cited in the reporting indicate that Buk Bijela would not contribute electricity to Montenegro’s system, because generation would operate within the energy frameworks of Serbia and Republika Srpska.

That asymmetry helps explain why critics focus less on power flows and more on ecological consequences. Environmental groups argue that Montenegro could bear impacts tied particularly to:

• Tara River canyon, described as UNESCO-protected
• Biodiversity and hydrological systems connected to Tara and Piva
• Tourism assets associated with one of Europe’s deepest canyons

The reporting also notes warnings from environmental experts that earlier versions could have submerged 12–18 km of the Tara canyon. Even revised designs remain controversial due to incomplete transparency regarding hydrological impacts. Beyond local effects, Buk Bijela would reshape parts of the Drina basin into an approximately ~30 km reservoir system, altering river dynamics at a regional scale.

Momentum since 2021—and integration into a larger cascade

The project formally began construction with a foundation stone in 2021. Current activity suggests renewed momentum as environmental assessments are updated and project structuring continues.

Buk Bijela is not presented as an isolated facility. It forms part of a broader cascade along the Drina River that includes Foča (44 MW), Paunci (43 MW) and Sutjeska (44 MW). Together, these plans bring total capacity to 224 MW, with annual generation estimated at roughly 871 GWh.

Buk Bijela alone is expected to deliver about 93–118 MW, depending on final design iterations, translating into annual production in the range of 320–350 GWh.

The core pitch: dispatchable hydro for stability amid volatility

The strategic rationale for Serbia and Republika Srpska is framed around hydro’s role as dependable generation. In their view, hydropower remains one of the few dispatchable, low-carbon baseload sources available in the region—particularly valuable where power markets are shaped by volatile gas prices and intermittent renewables.

The reported system benefits include grid stability and balancing capacity, reduced exposure to imported gas, and long-term low marginal cost electricity. Within Southeast European power market conditions—where price spreads and congestion are described as widening—the case for such assets strengthens further when integrated into cross-border balancing and ancillary services markets.

A polarized debate over impact—and what counts as “significant” risk

The controversy around Buk Bijela is sharply divided between two narratives.

No-impact argument: Official environmental impact assessments backed by developers conclude there will be no significant cross-border environmental impact on Montenegro. This position includes claims that Durmitor National Park or the Tara River would not be affected beyond existing hydropower influence.

Cumulative-risk argument: Environmental groups and independent experts counter that key hydrological parameters remain insufficiently disclosed; cumulative impacts from cascade development may be underestimated; and UNESCO status for protected areas could be jeopardized.

The reporting links this split to a wider infrastructure pattern across Southeast Europe: disputes often turn on whether assessments adequately capture cumulative ecosystem risk in river basin projects rather than focusing only on individual facilities.

An unresolved concession dispute keeps contractors cautious

The story also highlights that renewed momentum has not fully removed major uncertainties. A central issue remains a <legal dispute over concession rights within Bosnia and Herzegovina, which has already been flagged by Bosnia’s Constitutional Court but remains unsettled.

This uncertainty reportedly makes potential contractors—including Chinese engineering firms—hesitant about entering work where legal status is still disputed.

Montenegro’s internal posture adds another layer of complexity. The government has previously stated it will not participate in the project, while parts of the political majority and stakeholders in the energy sector have expressed support or openness. At the same time, regulatory engagement from Montenegrin institutions has been described as limited or inconsistent.

A test case for next-generation infrastructure decisions in SEE

Buk Bijela sits at the intersection of two competing priorities: energy security alongside decarbonisation versus environmental protection tied closely to tourism-driven economic interests. For Serbia and Republika Srpska, expanding domestic generation capacity aligns with reducing import dependency; for Montenegro, however, participation risks undermining assets defined by eco-heritage branding, tourism demand linked to nature-based segments, biodiversity considerations relevant to EU accession alignment, and broader environmental positioning.

This tension shapes how investors may view financing prospects. The project fits an archetype investors recognize—a moderate CAPEX profile (about €200–400 million), strong long-term generation value, and low operating costs after commissioning—but it carries elevated risk layers including cross-border environmental disputes, legal uncertainty within Bosnia and Herzegovina, and heightened scrutiny from EU institutions and lenders under tightening ESG expectations.

The reporting concludes that Buk Bijela signals hydropower returning prominently to Southeast Europe’s strategic agenda after years dominated by solar-and-wind expansion—yet under conditions far more demanding than earlier cycles: stronger environmental constraints, more organized public opposition, tighter EU regulatory alignment requirements.

If current trajectory holds, Buk Bijela will likely keep progressing based on Serbian and Republika Srpska drivers even without Montenegro’s participation—creating what it describes as infrastructure with cross-border impact but without cross-border alignment. For Montenegro, then, the question becomes less whether construction advances than how it positions itself diplomatically while protecting its environment—and managing long-term energy strategy amid an increasingly collision-prone policy landscape where capital deployment meets ecological limits.