Bulgaria’s energy landscape is witnessing significant advancements as the Chaira pumped-storage hydropower plant has successfully restored another generating unit, reinforcing its role in ensuring grid stability and enhancing overall energy security. This facility is pivotal for the national electricity system, particularly as it navigates increasing demand and fluctuating supply conditions.
During a recent inspection of the plant, caretaker Energy Minister Traicho Traikov confirmed that two of the four operational units are now active, underlining Chaira’s importance in maintaining equilibrium within the national grid. The Minister emphasized that the plant is essential for balancing the electricity network and safeguarding system integrity.
The third hydro unit has undergone comprehensive repairs and has successfully completed its final start-up and pre-commissioning tests. Currently operating in test mode, this unit will continue to function under this status until it secures Act 16, the official certification necessary for full commercial operation. Testing commenced on February 17, focusing on dry start-up procedures to ensure seamless coordination across all major systems. Minister Traikov noted that a successful 72-hour trial run has already been completed.
In parallel, hydro unit 2 is actively operational and poised to transition into pumping mode, capitalizing on periods of lower electricity prices. This capability exemplifies the inherent flexibility of pump-storage plants, which can store energy during off-peak pricing and release it during peak demand periods, thereby contributing to market efficiency.
The strategic significance of the Chaira facility extends beyond routine operations; Minister Traikov pointed out its critical role during emergencies. The plant can provide internal electricity supply to the Kozloduy nuclear power plant in case of widespread disruptions, positioning it as a vital stabilizing asset within Bulgaria’s energy framework.
Looking ahead, preparations for further rehabilitation efforts are underway, with documentation being finalized for public procurement related to hydro unit 1. This unit is scheduled to return to service by 2028, with a procurement structure designed to attract substantial market interest by separating equipment supply from construction and installation tasks.
The Ministry of Energy is also investigating potential future developments in pump-storage capabilities across Bulgaria. Initial analyses have identified ten potential locations for similar projects, indicating a proactive approach towards enhancing national energy infrastructure. Furthermore, according to Krasimir Dimitrov, Chief Technology Officer of the state-owned National Electricity Company (NEK), all command and control systems for hydro unit 3 have been modernized, with expectations set for its operating permit by May.
