About Thelcon

Thelcon is a dynamically growing technical – construction company with a rich specialization in energy and environmental systems for buildings and industries.

Founded in 1999, the company has completed 20 years of continual growth in the buildings’ sector. Thelcon’s staff have decades’ worth of experience in energy planning, audits, and energy conservation. The company’s services have already been used by nationally and internationally recognized bodies involved in energy related projects, such as the European Union, National Technical University of Athens, Greek Regulatory Authority for Energy, and others.

The company is highly specialized in building energy control and automation systems (BEMS) with extended installations in large buildings and multinational store networks. Thelcon has also undertaken and carried out successfully technical projects for major groups of private companies, such as Mytilineos Holdings, Piraeus Bank Group, AB Vassilopoulos, and others.

Preparing for future services and buildings’ needs, Thelcon has developed an energy auditing software for buildings and industries, aiming for optimization of energy conservation.

20 +

Years of experience

100 +

Completed projects





Thelsoft is a web application that monitors, controls, and depicts consumption of energy and water, temperature, and other environmental & energy data of a building.


Complete platform

Identify when and why energy is consumed, and areas where energy is wasted.

Custom solutions

Adaptable to each building and its respective needs.


Energy audits

Energy audits in buildings & industries. Systems upgrade and energy consumption
improvement proposals.

Control Systems (BEMS)

Construction of energy control systems. Emphasis on optimal automated building operation and on energy consumption control.

Energy Audits

Energy audits for buildings and industries. Development of E/M systems such as heating & cooling, lighting, electrical and control systems.

Specialized Constructions

Specialized constructions and contracts of buildings’ energy systems. Installation of air conditioning, electrical and control systems, etc.


Supervision of constructions, in accordance with the respective specifications and audits. Certification of optimal completion. 

Software Development

Development of custom solutions software, specialized on energy control, customized for the needs of each customer.

Our Projects

Thelcon has succesfully completed a number of technical, energy and environmental projects commissioned by leading companies and organizations, in Greece and worldwide.

Our aims

The realization of the projects aims at an increase in energy efficiency, with optimal customer service, and the least possible environmental impact.