The total energy consumption of Aalto CRE’s buildings was 34 GWh in 2015. The average electricity consumption of buildings in relation with their square meters was 100 kWh/brm2 in 2015.
The consumption is not divided evenly between the buildings, but six of the biggest consumers use approximately 50 % of the electricity. Even slight improvements in energy efficiency in these buildings are significant in terms of the whole. The biggest electricity consumers among the buildings owned by Aalto University Properties are Otakaari 5-7 (Electrical and Communications Engineering), Otakaari 1(the former Main Building), Kemistintie 1 (Chemical Technology) and Puumiehenkuja 2 (Nano building).
In relation with square meters, the biggest consumers in Otaniemi are Puumiehenkuja 2, Konemiehentie 2 (Computer Science building), Kemistintie 1 and Puumiehenkuja 3 (Mechanical Engineering 2). For example, the electricity consumption of the Nano house in 2014 was 318 kWh/brm2, which is three times bigger compared to the average consumption.
The electricity supplier is Nord Pool, and in addition Otaniemi has some of its own local electricity production with small-scale wind power and solar energy. Local production was approximately 29 MWh, less than 0.1 % of all the electricity demand. Since 2013, Aalto University Properties has aqcuired certified renewable electricity. Already in 2014 and 2015 almost all of the electricity used was certified.
Electricity consumption by sources 2012-2014.
All the buildings in Otaniemi owned by Aalto CRE are connected to Fortum Ltd’s district heating network. The total district heating consumption of the buildings in 2015 was approximately 45 GWh. The average heat consumption in relation with the square meters was 127 kWh/brm2.
In terms of heating, the five biggest heating consumers consume approximately 50 % of all the heating energy consumption on the properties owned by Aalto University Properties Ltd. Similarly to the big electricity consumers, even small energy efficiency improvements made in buildings that consume a lot of energy are significant in terms of the whole. The biggest heating consumers are Otakaari 5-7 (Electrical and Communications Engineering), Otakaari 24 (Dipoli), Kemistintie 1 (Chemical Technology), Otakaari 1 (former Main Building) and Vuorimiehentie 2 (Material Technology).
In terms of square meters, clearly the biggest consumer in 2014 was Dipoli with 670 kWh/brm2.
Espoo district heating is mainly produced at combined heat and power production facilities (CPH) that burn natural gas and coal. In addition, the heat produced in the heat production centre located in Otaniemi covers the peaks of heating consumption. The heat production centre uses natural gas and heavy fuel oil as fuel.
St1 has an ongoing geothermal energy project in Otaniemi. The company is currently drilling deep production boreholes. The pilot production plant is estimated to be ready for use in 2017. Fortum will buy the produced heat to their district heating network and can cover with that as much as 10% of the district heating demand of the city of Espoo.
Heat supply by sources in 2012.
A geothermal heating system is in use in the Saha building (Konemiehentie 1). In the Aalto Inn researcher hotel, managed by Aalto CRE, district heating also functions as a solution supporting geothermal heating. The geothermal heating system produces altogether 100-200 MWh heat on an annual level. In addition, in total 20-25 MWh solar heat is produced in the Konetekniikka 4 building and Aalto Inn researcher hotel and the Electrical and Communications Engineering building.
According to a report done by Geological Survey of Finland (GTK) in 2014-2015, the geoenergy potential of Otaniemi area is either excellent or good. The results of the report will be used in planning future projects, such as the New Building and Dipoli renovation.
In some of the buildings, the cooling energy is produced mechanically with a compressor cooling unit. In the Aalto Inn researcher hotel, there is a geothermal heating system that is utilised for cooling during the summer time. In addition, some buildings have air source heat pumps, which operate as separate coolers.
The electricity consumption of cooling devices is not separately measured, and therefore the cooling need has been estimated based on the energy reviews and energy audits. The annual cooling energy consumption is in total approximately 1,000 MWh.