What is an Energy Saving Certificate (ESC)?  

The Certificate of Energy Saving (CAE) is an electronic document that certifies the savings achieved after a duly verified energy efficiency performance. These savings, expressed in kilowatt hours (kWh), can be traded or sold, thus offering an opportunity to monetize energy improvements and encourage investment in sustainability.  

The CAE system, promoted by the Ministry for Ecological Transition and Demographic Challenge ( MITECO), is one of the most important initiatives for meeting national and European emissions reduction commitments. It recognizes and highlights energy efficiency measures implemented by companies, administrations, and public and private sector entities. In this way, each certified energy saving translates into a tangible step towards ecological transition and a low-carbon economy.  

Accredited verification: a guarantee of technical rigor and transparency. 

ENAC accredited verification is a mandatory requirement for the validity of Energy Saving Certificates. Only accredited entities can guarantee that savings are calculated and recorded in accordance with the technical criteria established by MITECO.  

ACERTA has obtained ENAC accreditation to carry out the verification of standardized measures within the official Energy Saving Certificate System scheme. This recognition positions the entity as one of the few bodies competent to perform this task in Spain, consolidating its role as a trusted partner in energy efficiency and sustainability.  

Our intervention ensures that each efficiency project has a thorough technical and documentary review. Your verification process includes:  

• Verification of the eligibility of the measure, according to the official catalog of standardized actions.  

• Review of the technical documentation and supporting documents, ensuring consistency between the technical data sheet, calculations and actual execution data.  

• Verification of the application of conversion factors, which transform physical measurements into energy saved.  

• Traceability control, ensuring consistency of information between all phases of the file.  

The result of this process is an accredited report confirming the reliability of the savings and their suitability for the certification system. This electronic document becomes valid technical evidence for registration in the Energy Savings Certificate System.  

"Our working model is based on technical rigor, meeting deadlines, and personalized attention, tailored to the characteristics of each organization and project," says Soledad Martínez, director of the ESG Area at ACERTA.  

Advantages of CAE for companies 

Verified Energy Saving Certificates provide added value to companies, both from an economic and reputational point of view. Organizations participating in this system can:  

1. Monetize the energy savings obtained by selling or transferring them to obligated parties.  

2. To certify compliance with sustainability and corporate social responsibility policies.  

3. Demonstrate the real energy efficiency of your projects to clients, investors and administrations.  

4. Access to incentive programs or green financing, linked to energy saving objectives.  

5. Strengthen its corporate positioning in terms of ecological transition.  

The CAE system drives energy savings in companies, helping them to reduce operating costs and strengthen their environmental commitment.  

Actions that can generate Energy Saving Certificates 

 The CAE system covers a wide range of energy efficiency measures in the industrial, residential, and service sectors . The most common actions include:  

• Replacement of luminaires with LED technology, indoors or street lighting.  

• Renewal of fossil fuel boilers with heat pumps or connection to efficient heat networks.  

• Energy rehabilitation of buildings, through the improvement of the thermal envelope or the replacement of windows.  

• Replacement of old appliances with efficient models.  

• Automation of installations to optimize energy consumption.  

• Promotion of electric vehicles and sustainable mobility, such as carpooling or the use of low-resistance tires.  

These actions demonstrate the impact that the CAE system can have both on the economy and on the transition to a more sustainable and competitive society.  

How to obtain an Energy Saving Certificate step by step 

The process to obtain a CAE is simple, but must be done with the intervention of an accredited entity. The basic steps are as follows:  

1. Identify the energy efficiency measure applied in the company or facility.  

2. Compile the technical documentation that justifies the action (data sheets, calculations, reports).  

3. Request verification from an accredited entity, such as ACERTA, which will verify the validity of the information and compliance with the technical criteria.  

4. Receive the accredited technical report, which endorses the consistency of the results.  

5. Obtain the Certificate of Energy Saving (CAE), which can be registered or transferred within the official system.  

This process ensures that the declared savings are real, verifiable and officially recognized.  

Why choose ACERTA to verify your Energy Saving Certificate?  

With more than 20 years of experience in the market, ACERTA is one of the most reliable independent certification bodies at national and international level. Its vocation is excellence, offering services of high added value and maximum quality.   

Since its inception, the entity has been characterized by its innovative approach and constant research in new areas of work, which has allowed it to maintain leadership positions in its areas of activity. Accompanying organizations on their path towards quality, sustainability and innovation, through certification, verification and technical assessment services carried out with rigor, independence and commitment.   

If your company develops energy efficiency projects and wishes to obtain its Energy Saving Certificate (CAE), contact ACERTAan entity accredited by ENAC, for a technical verification carried out with rigor and all the guarantees.