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Operation & Maintenance

Operation & Maintenance

The photovoltaic systems are facilities in need of preventive, scheduled, emergency maintenance and post-warranty service. With our 14 years of experience as a specialized company, we are offering our customers a detailed contract and services including the entire range of activities for the monitoring, the management and the maintenance of their photovoltaic  power plants.

Scheduled Maintenance

Scheduled maintenance is also known as preventive maintenance. Properly performed prevention ensures a long service life of your photovoltaic system and reduces out-of-warranty maintenance costs.

Emergency Maintenance

Emergency maintenance is related to the repair or replacement of a damaged component or components of the photovoltaic system. Most often it is defective panels, damaged cables or inverters. A quick response to emergency maintenance is key to the proper functioning of the PV system.

Preventive Maintenance

Preventive maintenance is performed at least once a year and includes a review of construction, all electrical connections, strings, cables, etc. It also includes a test of the inverters according to the manufacturer’s instructions, as well as other specific tests.

Сашо Димитров, изпълнителен директор, ГЕС

Sasho Dimitrov

CEO

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Владимир Нелковски, Директор поддръжка, ГЕС

Vladimir Nelkovski

Director of Maintenance

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Marin Penkov

Marin Penkov

Electrical Engineer

Marin Penkov works on various engineering projects related to the design, construction, and maintenance of electrical systems, demonstrating both technical skills and strong teamwork. He is proficient in using specialized software, including AutoCAD (for technical drafting), DJI Terra (for 3D mapping and terrain analysis using drones), and SketchUp (for 3D modeling and visualization). He utilizes these tools in both his professional work and personal projects.

His main interests include electrical power engineering, 3D printing, and 3D modeling. He actively keeps up with developments in these fields and strives to apply modern technological solutions in both his professional activities and personal endeavors.

Zvezdelin-Vergilov

Zvezdelin Vergilov

Logistics Executive

Lili-Naidenova

Lilia Naidenova

Head of Engineering

Liliya graduated from the Technical University of Sofia with a Bachelor’s degree in Electrical Engineering and a Master’s degree in Renewable Energy Sources. Her interest in photovoltaics began during her studies, and she has been professionally involved in the field since 2007, when she took part in the design of the first megawatt-scale photovoltaic plant in Bulgaria.

Since then, she has been actively engaged in the design of rooftop and ground-mounted solar installations in both Bulgaria and across Europe, including energy storage facilities.

Since the spring of 2025, she has been working at GES Energy, where she is responsible for organizing the entire design process and serves as an electrical design engineer.

Yavor Kirov

Electrical Design Engineer

Yavor Kirov is an electrical engineer with a Bachelor’s degree in Electrical Engineering from the Technical University of Sofia. He has over three years of experience in the design and construction of photovoltaic power plants, both rooftop and ground-mounted. Over the years, he has participated in numerous projects related to energy efficiency, renewable energy sources, and the implementation of smart technologies for electricity management.

Since the spring of 2025, Yavor has been part of the engineering team at GES Energy AD, where he holds the position of Electrical Design Engineer. In this role, he is responsible for preparing investment projects for photovoltaic power plants, power supply installations, and energy storage systems.

Stanislav Pandev

Technical Director

Eng. Stanislav Pandev has been in the construction industry for over 7 years. He graduated with a degree in Applied Geodesy from UACEG, Sofia, in 2018, and holds full design certification in his field. He worked as an investor control specialist in building construction for four years.

Stanislav joined GES Energy in the fall of 2023 as a Project Manager and was promoted to Technical Director in the spring of 2025. His responsibilities include overseeing, organizing, and controlling the entire process of constructing future photovoltaic power plants.