The majority of the energy used by Caruna consists of electricity distribution and transformer losses. The distribution of electricity always involves some loss, and the electricity distribution company is responsible for these. We strive to enhance the energy-efficiency of our networks. From autumn 2015, all new distribution transformers used by Caruna are low-loss ECO transformers compliant with the updated EU Directive (EN 50464-1, EU146-EN).

We use CO2-free (zero carbon dioxide emissions) electricity to compensate for grid losses. In 2015, we purchased 375.3 GWh of electricity to compensate for the loss of electricity.


 GRID LOSSES FROM 2013 TO 2015 (GWh) 2015 2014 2013
Grid losses 375.3 391.4 411.7
Caruna Oy 291.3 300.8 327.0
Caruna Espoo Oy 84.0 90.6 84.7
Caruna Oy network 3.7%
Caruna Espoo Oy network 2.7%
Caruna network (110 kV) 0.7%

Standby power plants use small quantities of different fuels, which the contractors acquire.

Caruna’s own consumption of energy

Caruna’s own consumption of energy mainly consists of the electricity and heating energy used in office buildings. The majority of Caruna’s energy consumption comes from the offices in Espoo, on Upseerinkatu, in use since September 2015.

The following table shows the consumption of energy between 2014 and 2015 (MWh). The values include consumption in the main office on Upseerinkatu since the beginning of September and regional offices owned by Caruna. They do not include Caruna’s Keilaniemi offices, as energy costs were included in the rent there.

Own consumption of energy (MWh)

  • Electricity
  • Heating

In accordance with the Energy Efficiency Act (ETL 1429/2014) introduced at the beginning of 2015, Caruna investigated and reported to the Energy Authority the data on their total energy consumption, energy consumption profile, and energy-saving potential. Electricity network losses are not included in this energy audit.


Sun panels were installed on the roof of the building.

The energy audit included a detailed review of the energy consumption and the potential for making the Upseerinkatu offices more energy-efficient. At the moment, Caruna does not have data on how the consumption divided in the building; the shares are based on estimates. The majority (nearly 75%) of the energy is used for cooling down the servers and the control room, as well as for cooling, heating, and ventilating the rest of the building. Other significant energy consumption functions are hot water heating and lighting, for instance. The energy consumption of the restaurant operating in the building has not been taken into account in Caruna’s energy consumption profile.

Upseerinkatu premises use both district heating and ground heating. We plan to install submeters in the Upseerinkatu premises during 2016 to analyse the actual distribution of energy consumption.

Sun panels were installed on the roof of the building at the end of 2015, and their peak power is approximately 29 kWp and estimated yearly production 30 MWh.