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AD ECM Skopje

Leak Management and Repair Strategy at Sveta Petka Hydropower Plant

Case Study: Leak Management and Repair at Sveta Petka Hydropower Plant Using Euras Technology Solutions Overview This case study explores how Sveta Petka Hydropower Plant utilized Euras Technology Solutions to address and repair multiple leaks in its facility, ultimately improving the overall plant efficiency and safety. The repair involved the use of Euras Magic Gel, alongside innovative water isolation techniques, providing a comprehensive, sustainable, and cost-effective solution.

Case Study:

Learn how the Sveta Petka Hydropower Plant, a 36.4 MW facility harnessing the Treska River, resolved its leakage issue without hefty costs. This case study outlines the steps taken for leak assessment, analysis, and the cost-effective repair process. We delve into the plant's state-of-the-art remote monitoring system and discuss the crucial role it plays in North Macedonia's energy landscape.



The Sveta Petka Hydropower Plant became functional on August 1, 2012, and plays a vital role in North Macedonia's energy production. With an installed capacity of 36.4 MW and an annual average generation of 43 GWh, the facility uses the Treska River to provide sustainable energy. It features advanced telecommunication process equipment and is fully automated, enabling remote operation from various locations such as AD ESM's production dispatch center in Skopje or AD MEPSO’s NDC. The 64-meter high dam is constructed with almost 30,000,000 m³ of concrete, following a unique double curvature arch design—making it the first of its kind in North Macedonia.

Importance of the Dam:

  • Sustainable Energy Production: The dam contributes to a greener energy mix for North Macedonia, reducing dependency on fossil fuels.
  • Regional Economic Impact: Generates employment and encourages ancillary industries.
  • Strategic Importance: Helps in water storage and flood control in the Treska River basin.

The Challenge: Leak Identification and Assessment

In late 2020, engineers detected leaks in the dam structure. A failure could be catastrophic, affecting both the energy production and local communities.

Condition of the structure:

Concrete arch dam, h=64m,

d=2,0-10,0m; visible leaks in joint areas of the concrete

segments and expansion joints.

Steps for Leak Assessment:

  1. Initial Surveillance: Using drones and underwater cameras to identify possible leak locations.
  2. Data Gathering: Employ the plant's existing remote monitoring systems to collect real-time data on water levels and pressure.
  3. Structural Analysis: Consultation with experts to determine the severity of the leaks.

Analysis and Repair Strategy:

  1. Feasibility Study: Evaluate the cost of various repair options including concrete reinstallation and sealants.
  2. Decision: Opt for a high-grade sealant as it offers durability and quicker application with lower costs.

Costs Involved:

  • Assessment Costs: Approx. $50,000 for drones, underwater cameras, and expert consultations.
  • Repair Costs: Approx. $200,000 for the high-grade sealant, labor, and other miscellaneous costs.

Restoration Process Overview:

Utilizing Euras Gel Type B in a high-pressure hydraulic injection system, pressures of up to 200 bar were achieved to effectively infiltrate water courses located at the joints of concrete segments. The existing water served as a vector for the gel's dispersion, enabling permanent suppression of water ingress and preventing its recurrence. During the injection process, a 17-micron interstitial space was generated within the working coupling in a time frame of less than one millisecond. This outcome is attributable to the gel's particulate dimensions, which measure 3 microns, significantly smaller than any other commercially available sealing materials. Approximately 2,500 kilograms of Euras Gel were deployed in this operation.

Additionally, the project revealed the presence of water-filled cavities in what was otherwise perceived as high-quality concrete structures, specifically in those that had been subjected to extreme conditions during both construction and operational phases.

The Sveta Petka Hydropower Plant successfully identified and repaired the leaks in its dam structure without incurring the significant costs typically associated with such endeavors. This was possible due to its advanced remote monitoring system and a carefully considered cost-effective repair strategy. The dam continues to play a vital role in North Macedonia's energy sector, showcasing the effectiveness of timely maintenance and smart decision-making.


Sveta Petka Hydropower Plant, leak repair, cost-effective solution, Treska River, North Macedonia, remote monitoring, sustainable energy, dam maintenance, high-grade sealant.

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