Barcelona City Council | Capital humàBarcelona City Council website

Home  > Job profiles

Get to know this occupation


The geothermal technician is the professional qualified to plan, develop, operate and maintain installations of this type of renewable energy. He/she is a professional technically qualified to intervene in any of the design and operation phases of the installation, which has the particularity that part of the equipment is buried.

In its broadest sense, geothermal energy is the heat energy that the earth transmits from the inner layers of the earth's crust to the outermost part of the earth's crust. This energy can be used for heating, cooling and domestic hot water production as well as for industry. The basic principle of geothermal energy is that, regardless of the time of year, from a certain depth, the ground is always at a practically constant temperature: between 15 and 20 metres, the ground temperature stabilises at around 17 degrees Celsius. Thus, in winter, geothermal heat pumps absorb the heat from the ground and function as a heating system, while in summer they collect the cooler temperature from the ground to cool the environment. In this way, the geothermal energy installation functions as a heat exchanger, is always in operation and is a renewable energy present throughout the territory.

The main applications of geothermal energy in the home are the production of domestic hot water (DHW), heating in winter (applicable to any building, such as flats, retirement homes, hotels, greenhouses or farms) and air conditioning in summer, as well as for heating swimming pools. At the industrial level, apart from air conditioning, the energy generated can also be used in industrial processes.


In the project planning phase, these professionals carry out the following tasks:
  • Carry out preliminary and necessary topographical surveys to know the characteristics of the land and the cost of drilling.
  • Explore the possible alternatives for the future geothermal installation (vertical exchanger, surface exchanger or groundwater use).
  • Perform a desk study of the thermogeological characteristics or by means of a Thermal Response Test (if necessary), to determine the specific parameters of soil temperature, thermal conductivity, exact depth, type of soil, etc.).
  • Review the data previously obtained and carry out the planning of the project according to the energy needs of the future installation (single-family detached house, a sports facility, a residential building, etc.). Also consider the risks of the project (financial, new regulations, delays, resistance and use of materials, etc.) to ensure the success of the installation.
In the development phase:
  • Supervise the process of definitive drilling of the ground to make the pipes that will act as heat exchangers.
  • Carry out the construction of the geothermal installation (heat pump, pipes, electrical system, regulating elements, etc.), ensuring the quality of the process always in accordance with the applicable regulatory requirements and in accordance with the technical requirements set in the project definition and also in accordance with the established costs.
  • Responsible for directing and monitoring the start-up of the installation, evaluating the performance and cost parameters, and establishing the necessary adjustments until the results established in the planning phase are definitively obtained.
Operation and maintenance phase:
  • Regularly carry out the general supervision of the operation of the installation and the general operations to ensure the useful life of the installation, considering the mandatory revisions established in the RITE (Regulation of Thermal Installations in Buildings), the annual maintenance certificate and the energy advice to the client (use, spare parts and updates in the installation, etc.) as well as the invoicing of the service.

Quick access and copyright:

Centre per al desenvolupament professional Porta22

Barcelona Treball (Porta22)
Llacuna, 156-162, 08018 Barcelona

Monday to Friday from 9 to 18 h

Generalitat de Catalunya
Unió Europea FEDER
Unió Europea FSE