Energy certificate OCR

Energy Performance Certificate 2.0 - How OCR drives sustainability

Charlotte Goetz

The energy certificate, often referred to as the energy pass, is something like the energy driver's license of a building. It provides important information about the energy efficiency of a building and shows how much energy is needed for heating, hot water production, cooling and ventilation.

With the help of advanced software, it is possible to automatically read and digitally process energy certificates. Konfuzio's text recognition technology allows you to bring your organization up to date while saving valuable resources.

Would you like to know what you can do with AI, Automation and Digitization in your industry? Then contact us at any time via the Contact form.

What is an energy certificate?

An energy certificate is an official document that provides information on the energy efficiency of a property. It contains information about the building's energy consumption and CO2 emissions, as well as recommendations for improving energy efficiency. The energy certificate helps to create transparency about the energy status of a building and provides owners, tenants and buyers with an important basis for potential decisions.

However, energy certificates are not only important for environmentally conscious real estate buyers or tenants. Governments, authorities and other organizations are increasingly relying on energy certificates to promote the energy-efficient refurbishment of buildings and to achieve energy targets.

Where are energy certificates required by law?

Energy performance certificates are now required by law in many countries to assess the energy performance of buildings. However, the exact requirements vary from country to country. In the European Union, Directive 2010/31/EU is currently in force, which provides for the introduction of energy certificates for all buildings that are rented or sold. This applies equally to residential and commercial properties.

Legal situation in Germany

In Germany, energy certificates for residential buildings have had to be presented for sale, rent or lease since 2009. Similar requirements apply in many other European countries.

Types of energy certificates

Energy certificates are divided into two types: The Demand certificate and the Consumption certificate. In the case of the demand certificate, the energy demand is calculated on the basis of the characteristics of the building and the heating system. With the consumption certificate, the energy requirement is determined on the basis of the measured consumption values.

Differences between demand certificate and consumption certificate

AspectDemand certificateConsumption certificate
Investigation typeDetermination of the energy demand by calculationDetermination of the energy demand by consumption
DifferencesBased on building and heating characteristicsBased on measured consumption values
AdvantagesIndependent of individual heating and living behaviorEasier data collection, cheaper option
DisadvantagesAccuracy dependent on acquisition precisionDependent on individual behavior, no recording of vacancies or number of residents

Why are energy certificates important?

Energy performance certificates not only serve to comply with legal requirements, but also have far-reaching effects on the real estate market and awareness of energy efficiency. For buyers and tenants, energy certificates offer a way to better understand and assess the long-term costs of a building. Properties with high energy efficiency mean lower energy costs in the long term, making them an attractive investment.

In addition, energy certificates encourage the shift to sustainable practices in the construction industry. Properties with low energy consumption are becoming the norm, as they not only offer environmental benefits, but also help to reduce operating costs and increase property values in the long term.

Contents of an energy certificate

The information contained in an energy certificate varies depending on the type and the legal requirements. The following list shows some of the most common contents:

General data

  • Name and contact details of the exhibitor (energy consultant or authorized exhibitor)
  • Date of issue of the energy certificate
  • Type of energy certificate (demand certificate or consumption certificate)
  • Period of validity of the energy certificate
  • Heating energy source
  • Energy certificate registration number (if required)

Specifications for the demand certificate

  • Energy demand of the building in kilowatt hours per square meter and year (kWh/m²a)
  • Scale for classifying energy requirements in efficiency classes (e.g. A+ to H)
  • CO2 emissions of the building
  • Year of construction of the building
  • Details of insulation of walls, windows, roof, etc.
  • Technical details of the heating system and hot water preparation
  • Type of water heating (decentralized or centralized)

Information for the consumption certificate

  • Energy consumption of the building in kilowatt hours per square meter and year (kWh/m²a)
  • Scale for classifying energy consumption into efficiency classes (e.g. A+ to H)
  • CO2 emissions of the building
  • Consumption data from the last billing years
  • Information on the number of users or apartments in the building
  • Information on the total usable area of the building

Read energy certificates automatically with Konfuzio

Numerous organizations are benefiting from digital and automated Document capture. In this way, they not only make their processes more efficient and thus save valuable resources, but at the same time reduce the error rate that may be associated with manual document processing. The data collected from the energy performance certificates can be processed, used and evaluated quickly and reliably.

The technology is based on the use of Optical Character Recognition (OCR) and a specially developed artificial intelligence (AI). This enables continuous improvement of software performance over time. The captured and digitally converted data from the OCR software is either exported or sent directly via a Application Programming Interface (API) imported to the appropriate place in an organization.

Energy certificate OCR
A digitalized energy certificate with the technology of Konfuzio.

The digitizing solution provided by Konfuzio is able to reliably process data even under difficult circumstances. One example is photos that have poor exposure or were taken from an unfavorable angle. Thanks to the integrated plausibility check, the system can even fill in missing parts of an incomplete document.

Excursus - What is API?

Application Programming Interfaces are programming or application interfaces that allow independent applications to interact with each other and exchange information. In addition to accessing databases or hardware (hard disks or graphics cards), an API also facilitates the creation of graphical user interface components - or makes this possible in the first place.

How does Konfuzio's Energy Performance Certificate OCR work?

Konfuzio OCR software is designed to transform information into digital data and extract it automatically. Konfuzio OCR reliably recognizes all relevant data fields needed for categorization.

Some of the readable data fields of a digitized energy certificate are:

  • Name and contact details
  • Date of issue
  • Validity period
  • Type of energy certificate
  • Validity period
  • Year of manufacture
  • Building part
  • Useful building area
  • Number of apartments
  • Renewable energies
  • Energy certificate registration number

Advantages of an energy certificate OCR

Konfuzio's text recognition can be customized to meet the needs of different organizations and provide diverse Extract data. But in addition to high-quality readout and extraction, intelligent energy certificate OCR enables process optimization in various departments and industries. Further advantages are:


Manually capturing information on energy performance certificates is time-consuming and error-prone. OCR software automates this process, providing a time advantage and minimizing errors.

Quick analyses

With OCR, it is possible to process a large number of energy performance certificates quickly. This allows precise data analysis and identification of trends in building energy efficiency.

Data acquisition

OCR is not only able to capture printed text, but also to recognize handwritten notes and diagrams on energy certificates. This expands the database and provides a more comprehensive content check.

Integrated data reconciliation

The data collected is automatically matched with other data sets, for example building information or energy consumption data. A more accurate assessment of energy efficiency is thus possible.

Outlook and conclusion

The integration of OCR technology into the energy certificate processing process is a promising step towards efficiency and sustainability. Advances in artificial intelligence and machine learning are expected to further improve the accuracy and versatility of OCR systems. The ability to quickly and accurately capture data from energy performance certificates will not only facilitate building efficiency analysis.

The energy certificate has also become an indispensable tool in the real estate industry. It promotes energy efficiency, enables informed decision-making for buyers and tenants, and helps reduce the environmental footprint. The global movement towards sustainability makes the digital energy certificate a key element in achieving tangible change in the way we deal with energy and the environment.

Highest standards in energy certificate OCR from Konfuzio

Through the officially certified security structure, Konfuzio establishes the highest standards regarding data protection and compliance with the General Data Protection Regulation (DSGVO). The OCR technology for energy performance certificates can be used flexibly, either locally (on-premises) or in your own protected cloud environment. For details, see our article on AI Cloud Solutions. By means of the API, the software can be easily integrated into an existing IT infrastructure.


How can documents be digitized?

To enable automated capture of information from documents and evidence using intelligent text recognition, it is necessary to convert them into digital formats. Common procedures for digitizing are scanning or photographing the documents. Here, a conventional scanner is used for documents.

Which documents can be captured automatically?

In addition to the energy certificate, countless other documents such as invoices, vehicle registration certificates, patient files or contracts can be easily read in and automatically processed.

What are the features of Konfuzio OCR?

The application possibilities of Konfuzio's OCR software are extremely versatile. Once a scan has been performed, all important information from various documents in different languages can be captured and subsequently processed. This information can be easily integrated via the API into internal organizational programs for further processing in sophisticated workflows.

Would you like to receive more information about Konfuzio? Feel free to contact Contact on. Our experts look forward to exchanging ideas with you.

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