Southern Gas Interconnection: how a Croatia–Bosnia link is reshaping Bosnia’s place in Europe’s gas market

The long-delayed Southern Gas Interconnection between Croatia and Bosnia and Herzegovina is emerging as one of the Western Balkans’ most strategically consequential energy projects, not for its sheer scale, but for the structural shift it enables. For Bosnia and Herzegovina—long reliant on a single gas supply route via Serbia and ultimately Russian-origin flows—the project represents a move away from isolation toward integration within the European gas system.

From LNG access to pipeline reach

The interconnection is designed to connect Bosnia and Herzegovina’s gas network to Croatia’s system, extending supply access to the Krk LNG terminal. Krk has become one of South-East Europe’s key entry points for non-Russian gas. The planned route runs from the Croatian network near Zagvozd toward central Bosnia.

Initial capacity projections are in the range of 1 to 1.5 billion cubic meters (bcm) per year. While this would be modest compared with major European pipelines, it is transformative for Bosnia, where total annual gas consumption has historically remained below 0.5 bcm.

Investable costs supported by EU-backed financing

Project capital expenditure reflects the pipeline’s scale but remains within an investable range. Total CAPEX is estimated at between €120 million and €180 million, depending on final routing, terrain complexity, and compression requirements.

A significant portion of the cost is expected to be covered by EU grants, particularly through instruments including the Western Balkans Investment Framework (WBIF) and Connecting Europe Facility (CEF). The remainder would be financed through concessional loans from institutions such as the EBRD and EIB. This blended approach is intended to reduce the equity burden and improve bankability.

Regulated returns with volume risk

In return terms, the project aligns with regulated midstream infrastructure economics. Revenue generation would be based on capacity bookings and transmission tariffs, with long-term contracts likely supported by industrial off-takers and local distribution companies.

Under this framework, investors could expect relatively stable returns in the 7–10% IRR range, depending on leverage levels and final tariff structures. The risk-adjusted profile is presented as attractive in a region where political and supply risks have historically constrained investment.

Demand uncertainty remains a key challenge because current consumption levels are low. The project’s performance depends on new demand centers—especially in industry and power generation—creating volume risk that could be partially mitigated through phased capacity expansion. The operating model described is “build-and-grow,” where early volumes support baseline capacity before incremental upgrades follow demand development.

Why it matters beyond gas diversification

The deeper value of the interconnection lies in its potential to reshape Bosnia’s broader energy and industrial landscape. Diversified gas supply can alter sector economics by improving stability—and potentially lowering costs—for industrial users in areas such as metallurgy, cement, and chemicals. In parallel, access to gas-fired generation can support balancing needs as Bosnia aligns more closely with EU decarbonisation pathways and integrates intermittent renewable power.

The link also introduces competition into regional gas markets by connecting Bosnia to LNG imports via Krk. By reducing existing suppliers’ pricing power while adding procurement flexibility, it could support more transparent pricing mechanisms aligned with European hubs such as TTF and CEGH over time—helping foster a more liquid regional market that may strengthen investor confidence.

Croatia’s hub role expands

Croatia’s position within this framework is also significant. The country has already invested heavily in Krk LNG, starting at an initial capacity of 2.6 bcm per year before expanding toward 6.1 bcm. Extending Croatia’s network into Bosnia enlarges its downstream market, increasing utilization rates at Krk and reinforcing its role as a regional gas hub.

For Croatia’s transmission system operator Plinacro, this would translate into higher throughput volumes and improved asset efficiency—supporting long-term revenue growth.

Execution hurdles in a complex governance environment

Despite its strategic logic, delivery faces constraints tied to Bosnia and Herzegovina’s complex political structure, which includes multiple administrative entities with overlapping competencies that have historically slowed decisions on large infrastructure projects. Regulatory alignment, permitting processes, and coordination between state-level and entity-level authorities are identified as potential bottlenecks.

Sustained political commitment will therefore be required alongside effective coordination mechanisms supported by EU institutions and financial partners.

LNG plus pipelines—and possible future adaptability

The project also reflects a broader lesson about energy infrastructure: LNG diversification alone has limited reach without sufficient pipeline networks. By bridging that gap, the Southern Gas Interconnection turns LNG from a coastal asset into part of a regional supply backbone—an especially relevant consideration given concerns about reliance on maritime routes in today’s geopolitical environment.

Looking further ahead, while the interconnection is primarily focused on natural gas, it may incorporate technical specifications intended to keep options open for future conversion toward hydrogen or other low-carbon gases as Europe explores decarbonisation pathways.

A catalyst for wider Western Balkans connectivity

The Southern Gas Interconnection also interacts with broader regional initiatives aimed at improving connectivity across South-East Europe. One example cited is the Ionian-Adriatic Pipeline (IAP), which aims to link Albania, Montenegro, and Croatia; although still in planning phase, it would complement the Croatia–Bosnia link by creating a more resilient network spanning Adriatic coastal access into inland markets across the Western Balkans.

A defining step toward integration

As Bosnia and Herzegovina moves closer to European Union integration, projects like this are positioned as defining elements of both energy security improvements and longer-term economic development. Even if the pipeline itself may be relatively small physically compared with major European corridors, its impact on how Bosnia fits into—and competes within—the wider European gas system could be disproportionately large.