Coal occupies a more important position in Bulgaria than its declining production trend might suggest. The country relies mainly on locally mined lignite, a low-grade form of coal used almost entirely in nearby thermal power stations. This domestic fuel has supported electricity generation, employment, and regional industry for decades, particularly in the Maritsa East basin of south-central Bulgaria.
The main argument for retaining coal capacity is energy security. Bulgaria has nuclear power, growing renewable generation, cross-border electricity connections, and access to imported natural gas, but lignite plants continue to provide controllable generation when demand rises or renewable output falls. Coal accounted for 22.1% of Bulgaria’s total energy supply in 2023, showing that it remains significant even as its position weakens.
However, the economic environment surrounding coal has changed. European carbon prices increase the operating costs of lignite-fired power stations because lignite produces large amounts of carbon dioxide for each unit of electricity generated. At the same time, solar capacity is expanding, electricity markets are becoming more closely connected, and several Bulgarian coal plants face technical and financial pressures.
Bulgaria’s coal question is therefore not simply whether mines and power plants should close. It is how quickly the country can reduce reliance on lignite without weakening electricity security or creating severe economic disruption in regions built around mining and thermal generation.
The Maritsa East Complex Defines the National Coal Industry
The centre of Bulgarian coal production is the Maritsa East energy complex in the Stara Zagora region. It includes the state-owned Mini Maritsa Iztok mining company, three large open-cast mines, several major power stations, industrial facilities, and a dedicated rail network.
The mines supply lignite directly to nearby thermal plants. This close relationship reduces transport requirements but also makes the local economy highly dependent on electricity generation. The mines have few alternative customers because lignite has relatively low energy content and is generally uneconomic to transport over long distances.
The principal power stations connected to the basin include the state-owned Maritsa East 2 plant, the AES Galabovo plant, and the Maritsa East 3 facility. Together, these assets have historically represented a large share of Bulgaria’s dispatchable generating capacity. The system was designed around continuous extraction and local combustion rather than commercial coal exports.
Maritsa East 2 is the largest state-owned coal-fired power station in Bulgaria. Its position gives the government direct influence over coal generation, employment, and security-of-supply decisions. Yet ownership does not remove the pressures facing the facility. The plant reported a loss of approximately €52 million for 2024 after earning substantial profits during the European energy crisis two years earlier. Lower wholesale electricity prices and the cost of carbon allowances contributed to the weaker result.
The situation illustrates how quickly the economics of Bulgarian lignite can change. Coal stations may become valuable during periods of tight regional supply, but struggle when renewable, nuclear, hydroelectric, or imported electricity lowers market prices.
Electricity Markets Are Reducing Coal’s Traditional Advantage
Coal and nuclear power have long formed the two main pillars of Bulgarian electricity generation. Lignite plants supplied domestic customers and helped Bulgaria export electricity to neighbouring markets. That model is becoming less dependable as electricity production and trade patterns change.
Bulgaria remained a net electricity exporter in 2024, but net exports fell to about 1.02 terawatt-hours, nearly 70% below the previous year. Combined output from coal and nuclear baseload plants reached approximately 28.46 terawatt-hours, down 10.7% from 2023. Renewable generation connected to the transmission network increased sharply during the same period.
Solar power is especially important to coal’s changing role. New photovoltaic capacity can reduce daytime wholesale prices and lower the operating hours available to thermal plants. Coal stations may still be needed during winter peaks, evening demand, or periods of weak renewable generation, but they can no longer assume the same annual level of operation.
This creates a difficult commercial structure. Coal mines and large thermal stations carry high fixed costs even when their output falls. Mines must maintain heavy equipment, rail systems, land-management programs, and large workforces. Power stations require maintenance, environmental controls, and carbon allowances. Reduced generation therefore does not produce an equal reduction in operating costs.
Some private coal facilities have already faced interruptions or uncertainty. Maritsa East 3 reportedly paused generation in 2024 after the expiry of a long-term electricity arrangement, highlighting the exposure of coal plants once guaranteed contracts or other forms of support end.
The Coal Transition Is Concentrated in Three Regions
The economic consequences of coal decline will not be spread evenly across Bulgaria. They will be concentrated in Stara Zagora, Kyustendil, and Pernik, where mining, power generation, engineering services, transport, and local suppliers have developed around the industry.
Stara Zagora faces the largest adjustment because of the scale of Maritsa East. The regional economy includes direct employment in mines and power stations as well as contractors, equipment providers, maintenance companies, and public services supported by industrial wages and tax revenue.
European institutions have identified the region as one of Bulgaria’s principal just-transition areas. Bulgaria is set to receive around €1.2 billion from the EU Just Transition Fund to support new economic activities and employment in Stara Zagora, Kyustendil, and Pernik.
The challenge is not limited to replacing a certain number of mining jobs. Coal employment often supports higher wages, technical careers, and industrial supply chains that are difficult to recreate through small service-sector projects. European Commission work in Stara Zagora has warned that the move toward a zero-carbon economy could affect a very large share of jobs connected to mining and energy production.
Effective transition programs will therefore need to attract industries capable of using the region’s existing strengths. These include electrical engineering, heavy equipment, industrial land, grid connections, transport infrastructure, and a technically experienced workforce. Renewable-energy manufacturing, battery systems, grid services, industrial parks, and land-rehabilitation projects may offer opportunities, but investment must reach commercial scale.
Bulgaria Has Chosen a Gradual Rather Than Immediate Exit
Bulgaria’s updated energy planning allows coal-fired generation to remain available into the 2030s. The country’s policy direction has generally favoured a gradual reduction rather than a fixed near-term shutdown of the entire sector. The updated national energy and climate framework has referred to phasing out coal-based electricity by 2038 while maintaining enough thermal capacity to protect system adequacy during the transition.
This approach reflects concerns about reliability, employment, and the speed at which replacement capacity can be built. Bulgaria cannot remove several gigawatts of dispatchable generation without considering winter demand, transmission constraints, reserve capacity, electricity imports, storage, and the operation of the Kozloduy nuclear power station.
Yet 2038 should not be understood as a guaranteed operating date for every mine and plant. Commercial conditions may force individual units to reduce output or close earlier. Carbon costs, maintenance requirements, wholesale electricity prices, renewable development, and access to state support will determine the actual pace.
The distinction between a political deadline and an economic operating life is especially important. A plant may legally remain open but run only during high-price periods. A mine may continue operating while reducing annual extraction. Some generating units may close while others remain available as strategic or seasonal capacity.
Replacing Coal Requires More Than Adding Solar Panels
Bulgaria has strong potential for solar power and further opportunities in wind, storage, grid modernization, and regional electricity trade. These resources can replace a growing share of coal generation, but they do not perform exactly the same system function.
Lignite stations can generate when instructed and may operate through long periods of weak wind or limited sunlight. Solar production is concentrated during daylight hours and varies by season. Battery storage can shift electricity over shorter periods, but large amounts of storage and flexible generation would be needed to manage longer supply gaps.
A secure coal transition will therefore depend on a combination of resources. These may include renewable generation, battery storage, pumped hydro, stronger interconnectors, demand management, natural gas capacity, nuclear investment, and improvements to transmission and distribution networks.
The location of replacement projects also matters. Building renewable capacity near coal regions could reuse transmission infrastructure and industrial land while preserving part of the local energy economy. Mine lands may support solar facilities, storage projects, logistics centres, or new industrial developments after environmental rehabilitation.
Bulgarian Coal Is Moving from Foundation to Reserve Role
Coal is unlikely to disappear suddenly from Bulgaria’s electricity system, but its function is changing. It once operated as a central source of continuous domestic and export generation. Increasingly, it is becoming a source of flexibility, winter security, and backup capacity within a more diverse market.
The long-term pace of decline will be determined less by the formal 2038 horizon than by plant economics, carbon prices, replacement generation, storage deployment, and regional employment policy. Bulgaria’s central task is to build enough dependable capacity before lignite production falls too far to support the existing system.
A successful transition would preserve electricity reliability while creating new industrial activity in the coal regions. Without that investment, Bulgaria could face a disorderly decline in which mines and power stations become uneconomic before replacement jobs and energy infrastructure are ready.
