User manual of TREA’s E-Monitor

The TREA E-Monitor is a tool that stores and analyses a building’s energy consumption and financial costs, thereby enabling the user to get a better understanding of the building’s needs and saving potential.

To use the application, the user needs to create an account with their e-mail address.

On the first visit, the application provides a choice of using a sample building or setting up your actual building in the E-Monitor environment.


You can describe the whole building (for example, an apartment building) or a part of it (such as an apartment in an apartment building) (hereinafter referred to as the Site).

In addition to general details, you can describe the sources of 3 types of energy (heating, consumption electricity, water):

  1. Heating equipment
  2. Electricity metre(s)
  3. Water heating equipment

An example of setting up several heaters. This describes the situation, where the main heat source is district heating, but is supplemented (if necessary) by an electric radiator.

Next, the expenditure data management and analysis will include a row and amount for each source:

All entries are independent of each other, meaning that only the energy required for this type of heating will be considered at each device. If central heating is also used to heat water, energy consumption required to heat the water must be subtracted when making the entry.

Independent entries are necessary for exact mapping of the Site’s energy needs by type, and to display exact results in the application for calculating the energy performance certificate.

Making entries under electricity metres is exceptional and one must keep in mind that energy bought from the grid must be entered instead of the electricity reading or another estimated amount on the Site, regarding other sources of electricity consumption. In case electricity is also used for heating (air source heat pump, direct-fired heater, etc.) or preparing hot water (boiler), then the heating and water costs are subtracted from the total electricity consumption in tables and diagrams.

Setting up a new site

Please note: before initial saving, check the type (and subtype) of your site, because this cannot be changed later.

Completing the exact profile of the site will ensure better results at a later analysis. If all data are not available or known, it is enough to know the closed net area and region of degree days to start using the application. A correctly determined region of degree days will enable you to exclude climate impact from the heating energy costs and conduct more accurate analyses by excluding weather features (read more: http://www.kredex.ee/energiatohususest/kraadpaevad-4/).

An example of a profile sufficiently completed for further analysis:

Enter the energy performance certificate information, in case it has already been issued for the building. If not, leave the field empty.

Entering consumption details

Under the consumption details related to the site, it is possible to manage the energy consumption and financial costs.

In order to estimate energy requirements, fill in all values of energy consumption. If you also wish to analyse financial savings, enter relevant values in euros.

Consumption details are entered for every source by month.

Two tools are available for entering consumption details:

  1. A calculator for finding a unit price of energy consumption through the total cost, and energy spent on heating water if there is no separate energy metre.

An example, where energy consumption for heating has been calculated through a € 225 invoice and hot water consumption. In order to fill in the fields correctly, enter the water consumption in cubic metres (3.5) and heating consumption in MW/hs (3.65). You will need this calculator, if you are located in a central-heating district, where you know the price but do not have an energy metre in your house. It is necessary to calculate the energy cost of preparing hot water when central heating is also used to prepare domestic hot water, while energy is not measured separately.

When using the calculator, keep in mind that the values must be entered in the correct fields to save them as consumption figures of specific months.

  1. Periodical entries enable dividing the energy consumption of a certain period between selected months.

An example, where total energy consumption is known from October 2018 to April 2019, but the distribution over months is unknown. By entering total consumption, details are divided across the period. This entry method enables the user to get a quick idea of the analysis part of the application. However, you need to keep in mind that consumption features may not be reflected (for example, heating more in a windy but warm month would only be shown in case of making regular entries). You will also have to consider that periodical entry will replace data in the consumption data dialogue and previously saved data will be overwritten.

If you choose periodical entry, keep in mind that in case of heating energy, degree day temperatures will be used over the specified period. Electricity and water will be distributed evenly.


It is possible to add notes with the purpose of recording changes which may increase savings in the application to assess their potential impact. For example, if windows are replaced or lighting systems are updated on the site, this can be noted under the relevant month and changes will be marked on diagrams.


Different measures need to be taken to analyse a site. The exact list depends on the set-up site; here, we will list the possible options:

  1. Renovation to achieve energy class A/B/C
    a) Applicable to apartment buildings, considering the already entered (if not, it will be calculated automatically) energy class
  2. Installation of solar panels
  3. Changes in consumer behaviour

More information is available for each measure upon their application.

Measures are set up to get an initial assessment and these should not be viewed as final verdicts. Our experts who conduct detailed analyses, will provide you with an accurate understanding and analysis.


Correctly entered sites are used to make a sample, where the user can choose similar sites to their own to compare costs per square metre. This will help you assess, whether your site costs are rather a norm or exception and make appropriate conclusions. In case of comparison, please keep in mind that the details are not 100% accurate, since these are anonymous sites entered by other users.


There are 3 main ways to share a site:
1. Invite a user to become an administrator or an observer

  1. Share the access link
  2. Extract data in .pdf or .csv format

When you invite a user, remember that an observer has access to all entered data, but cannot change them. An administrator can change both data and users.

Demo site

The E-Monitor team has prepared some sites for you to practice comparison and modulation. In demo sites, some details may be outdated (if the TREA team has not been able to enter details for the new month, for example), but it does not reduce the potential value they may have for learning programme functions.

E-Monitor and TREA

The application is intended to be used by owners/managers/users of real estate who are interested in the energy consumption of their site. Although, we do our best to make E-Monitor as accurate as possible to help you assess energy requirements, it is still reasonable to consult the TREA experts who have built the E-Monitor application before making real decisions.

It is advisable to contact experts at TREA through the system, because this will enable them to see the same details as the user does and give more accurate advice.