Energy Diagnosis: The Power of Energy Diagnosis

Energy Diagnosis is a key process for improving energy efficiency in different contexts. It represents a procedure aimed at understanding the energy consumption of buildings and industrial plants, identifying any opportunities for energy saving, contributing to the reduction of greenhouse gas emissions, improving the working environment, and promoting sustainability. 

This article, in addition to exploring what an Energy Diagnosis is, what it is used for, who is authorized to conduct it, and how often it should be done, offers an illustrative example of the process to follow.

What is the Energy Diagnosis?

According to the provisions of Legislative Decree 115/2008, the energy diagnosis by definition is “a systematic procedure aimed at obtaining adequate knowledge of the energy consumption profile of a building or group of buildings, of an industrial or commercial activity or plant or public or private services, to identify and quantify energy saving opportunities”. 

In other words, an energy diagnosis is a process aimed at evaluating and analyzing the energy consumption of a building or company to identify potential improvements in energy efficiency.

This process is often required by law and can be carried out by a qualified energy efficiency professional. The energy diagnosis represents an important tool for promoting energy saving and the reduction of greenhouse gas emissions. Energy diagnoses must comply with specific requirements of completeness, reliability, traceability, verifiability, and usefulness. 

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What is the Energy Diagnosis For?

The energy diagnosis includes a detailed assessment of energy consumption, equipment used, and consumption habits within the building or company. In an energy diagnosis process, the main objectives are:

Identification of Energy Inefficiencies:

energy diagnosis helps identify inefficiencies in energy consumption, which may arise from obsolete equipment, insufficient thermal insulation, heat losses, or energy waste.


Improving energy efficiency can lead to significant savings on energy costs. The recommendations that emerge from the diagnosis can help reduce energy consumption and therefore related expenses.

Reduction of Greenhouse Gas Emissions: 

energy efficiency is an important tool in the fight against climate change. By analyzing and reducing energy consumption, we contribute to reducing greenhouse gas emissions.

Strategic Planning: 

The energy audit can be useful for the long-term strategic planning of a company or structure because it helps to identify investments that can be made to improve energy efficiency and to calculate the expected returns on investment.

Increased Comfort and Quality of the Working Environment:

Improving energy efficiency can lead to a more comfortable environment for a building’s occupants.

In summary, the energy diagnosis serves to identify opportunities for improving energy efficiency, with economic, environmental, and operational benefits. It can be especially important for businesses and organizations looking to reduce energy costs, comply with regulations, improve sustainability, and demonstrate a commitment to environmental responsibility.

Energy Diagnosis: Is it Mandatory?

In Italy, the energy audit is mandatory for certain categories of businesses and buildings. The obligation of energy diagnosis is established by Legislative Decree 102/2014, which implements the European Directive 2012/27/EU relating to energy efficiency. 

Here we have defined the subjects who, every four years, must carry out an energy diagnosis. What subjects are these? Here are the main categories involved:

Large Businesses: 

Large businesses, defined as businesses with more than 250 employees or an annual turnover of more than 50 million euros and a total balance sheet of more than 43 million euros, are required to conduct energy audits every four years.

Superconducting Magnetic Energy Storage with High Energy Consumption: 

Superconducting magnetic energy storage may be subject to the obligation of an energy diagnosis if it exceeds certain energy consumption thresholds.

Other Subjects: 

Some public and private buildings exceeding a certain surface area may be subject to the obligation of an energy audit in case of renovation.

Specific requirements and thresholds may vary based on factors such as region, industry sector, and company size. To obtain specific details relating to the energy diagnosis and its obligation, please refer to the legislative decree and the official websites.

Energy Diagnosis: Who Can Do It?

In Italy, The Energy Diagnosis must be conducted by qualified professionals in the energy efficiency sector. These professionals must have the skills and knowledge necessary to evaluate the energy consumption of a building or business and provide recommendations to improve energy efficiency. But who can carry out the energy diagnosis?

The subjects involved in the energy diagnosis of a building are numerous and can play different roles. Below is a short summary table.

SubjectPossible recipientData ProviderInvolved in MeetingsField activities
Owner of the building or apartmentXXX
Plant managerXXXX
Director of Technical ServicesXXX
Security personnelX

In addition to these figures, there is the role of the Energy Diagnosis Representative, the technician who is considered responsible for the entire energy diagnosis procedure. 

This professional activity can be carried out by a freelancer (self-employed or associated), by a service company, by a competent public body, or by a work team. The skills required are excellent knowledge of the design of buildings and related systems. 

The energy diagnosis can therefore be carried out by those who, in addition to possessing these skills, are qualified professionals (registered in the Register), except for mandatory diagnoses according to the CAM decree, which must be drawn up by an ESCO-certified subject (UNI CEI 11352 ) or EGE (UNI CEI 11339).

Energy Diagnosis: Example

At this point, it may be useful to give an example of an energy diagnosis to understand how it works. The implementation of the energy diagnosis presupposes the execution of a well-defined procedure, the first phases of which are represented by a preliminary contact, the start-up meeting, and the collection of technical documentation, which also includes analysis and data collection in the field. In particular, the analysis phase is very complex, as it involves: 

  • Calculation of energy performance indicators
  • Creation of an energy inventory
  • Identification of interventions that could improve energy performance
  • Creation of cost-benefit simulations of energy improvement interventions on the property itself.

Furthermore, it appears particularly interesting to note that the energy diagnosis presents a section relating to the analysis of consumption within which some parameters are studied such as bills, the distribution of consumption, the distribution of diesel consumption, the estimate of the electricity consumption of electric pumps, boiler auxiliaries, heat pumps and the electrical system in general. 

The procedure finally includes a report and a final meeting. Among the objectives that an effective energy diagnosis sets is the improvement of the energy efficiency of the property and a substantial increase in the level of environmental sustainability of the same through the reduction of energy supply costs. 

These objectives can be achieved through a series of interventions that allow us to rationalize energy flows, identify the most appropriate energy-saving technologies, and manage the risks and technical and economic critical issues of the system itself.

In Conclusion

the energy diagnosis is an essential step towards a more sustainable future, saving on bills and reducing greenhouse gas emissions. In this regard, Pksolarpower has established itself as a leader in the field of Energy Efficiency, offering innovative solutions to improve energy management and accelerate the energy transition towards a greener future.