Connectivity, capacity, and flexibility are becoming the foundation of energy security

For many years, gas infrastructure in Bulgaria and the wider region was designed for a world with predictable flow directions, limited supply sources, and constrained flexibility and market integration. That era is now behind us. Today, the security of gas supply depends not only on the existence of transmission infrastructure, but also on the system’s ability to operate efficiently in both directions, ensure interconnectivity, integrate diverse supply sources, provide storage, and respond flexibly to market and geopolitical disruptions. In this context, Glavbolgarstroy has established itself as a leading partner in the development of modern and reliable energy infrastructure in Bulgaria and the region.

Since its establishment more than half a century ago, Glavbolgarstroy has developed its activities in close alignment with the energy sector, constructing critical gas infrastructure and accumulating experience in strategic projects of national and regional importance, commented Emil Angelov, Chief Executive Officer and Deputy Chairman of the Management Board of Glavbolgarstroy Holding during the forum The Regional Energy Summit 2026.

Historically, the company’s first major projects involved the construction of natural gas transmission infrastructure in the former USSR. Over the past two decades, however, its focus has shifted toward Bulgaria’s gas transmission network, where Glavbolgarstroy has become a leading contractor —independently or in consortia—on projects involving the modernization or construction of compressor stations, replacement of obsolete equipment, development of new transit gas pipelines, interconnectors, gas metering stations, and expansions of key sections of the national network.

Among the strategic projects that define this trajectory are the modernization of the Ihtiman, Lozenets, Petrich, and Strandzha compressor stations; the construction of the Rasovo and Nova Provadia compressor stations; the transit gas pipeline to Turkey; the Bulgaria–Serbia interconnector; the above-ground and feeder infrastructure to the Chiren Underground Gas Storage facility; as well as key looping sections of the Vertical Gas Corridor—Kulata–Kresna and Rupcha–Vetrino.

A Network for Energy Security

Whereas in the past the system functioned primarily as a one-directional transit corridor, today the objective is fundamentally different: regional connectivity with reverse-flow capabilities, increased capacity, automation, and storage integration. This is also the significance of the Vertical Gas Corridor, which is emerging as one of the most important energy projects in Southeast Europe.

Its importance goes beyond technical aspects and has a profound market impact. Without inter-system connectivity, it is impossible to ensure reliable supply and price predictability. Corridors and interconnectors provide access to alternative supply sources, enable the redirection of flows in times of surplus, and support the efficient use of storage facilities such as the Chiren Underground Gas Storage, which serves as a real instrument for market balancing, Emil Angelov explained at the Summit.

In this context, Glavbolgarstroy participates not merely as a contractor of individual facilities, but as a strategic partner in building critical infrastructure that delivers connectivity, increased capacity, and security of supply. This includes not only pipelines, but also compressor stations—without which gas transmission is impossible—as well as key looping sections, i.e. parallel pipelines that increase capacity where it is most needed and economically justified.

Planning, Logistics, and People

Large-scale infrastructure projects extend far beyond the construction phase itself. According to the company, the real risks begin long before the first weld and often remain invisible to the public. A critical phase is planning—from design and permitting to environmental procedures, route selection, and coordination with municipalities, landowners, and various stakeholders.

Angelov notes that even relatively short sections of a strategic project can prove extremely complex due to factors such as archaeological findings, crossings of national roads, railway lines, and water bodies.

Supply logistics also pose a significant challenge. The geopolitical environment directly affects access to traditional manufacturers, transport routes, and delivery timelines. In such conditions, any disruption can simultaneously shift schedules and increase costs, making disciplined project management and adaptability essential—not only for completing the project, but for doing so on time and within budget.

The human factor is equally critical. Project teams must possess not only construction expertise but also the ability to plan under conditions of high uncertainty. For example, certain sections of the Vertical Gas Corridor involve dozens of crossings of national roads, railways, and river routes—an environment that does not allow for standardized solutions. Every detail—from the sequencing of construction activities to coordination with adjacent infrastructure—can prove decisive.

Automation and Control in the New Generation of Energy Infrastructure

The transformation of gas infrastructure is not limited to physical routes; it also encompasses technologies. According to Emil Angelov, new projects can no longer be conceived merely as pipe-laying and equipment installation. They require integration between mechanical infrastructure, automated control systems, sensors, communication networks, and software.

In modern gas transmission systems, more than 60% of operational processes are already managed through digital monitoring and automation systems, making technological integration a key element of infrastructure. The installation of fiber-optic networks and automation systems has become part of the new standard, without which networks capable of transmitting billions of cubic meters of gas annually cannot be managed efficiently and safely.

This technological connectivity is becoming increasingly important at a time when the region is seeking solutions capable of supporting not only current gas flows but also future energy scenarios. According to European energy institutions, natural gas consumption in the EU remains in the range of 330–350 billion cubic meters annually, making regional market connectivity essential for supply security.

Finally comes perhaps the least visible, yet most critical phase—testing, drying, purging, commissioning, and the overall safety framework. In large infrastructure projects, testing procedures can account for up to 10–15% of the total implementation timeline, yet they are what ensure the reliability and safe operation of the system. In critical energy infrastructure, compromise is not an option.

Glavbolgarstroy’s current focus is on completing the Vertical Gas Corridor within the established deadlines. At the same time, the company is actively exploring opportunities related to future concession models in energy infrastructure.

More importantly, however, the projects being implemented clearly demonstrate the transformation of the sector itself. From a system designed for one-directional transmission, Bulgaria is gradually building a network based on connectivity, flexibility, and balance. This transition will define not only the country’s role on the regional energy map, but also its ability to face future crises with greater choice and reduced vulnerability.