Latvenergo AS builds the largest heat storage unit in the Baltics

A heat storage unit is built in the territory of CHPP-2 of Latvenergo AS to become the largest and the only heat storage unit in the Baltic countries with the volume of heat carrier of 18 thousand m³. An extensive and modern solution will ensure more efficient use of heating fuel in the country, reduce consumption of energy sources and increase competitiveness of CHPPs.

Project named “Creation of a heat storage system at CHPP-2, generating facility of Latvenergo AS” is implemented with co-funding of the European Union Cohesion Fund. The total project expenses amounted to EUR 9,045,041.85 million, with EUR 8,544,841.85 being eligible costs. The intended EU co-funding is 30% of eligible costs without exceeding EUR 2,563,452.55.

The heat storage system will ensure savings of primary energy sources (no less than 2,421 MWh/year), the reduction in CO2 (no less than 9,041 t/year), as well as will store at least 65,013 MWh of heat energy per year. The creation of this heat storage system will increase the security of heat supply of the Riga district heating system (DH) on the right bank. It will not only foster saving of energy sources and improvement of efficiency indicators, but also increase the use of CHPP-2 power units in the cogeneration mode, creating additional conditions for a lower market price of electricity and heat in Riga and all over the country.

In June 2020, the construction of main structures of the heat storage tank in the territory of CHPP-2 of Latvenergo AS was completed.  Currently, construction works are still being performed in the project “Creation of a heat storage system at CHPP-2, generating facility of Latvenergo AS”.

The foundations were laid in autumn 2019, and in January 2020 the construction of the heat storage tank started and has currently reached the design height – 47.8 meters. 

A connection to the heating network has been constructed and shut-off valves on lines of power-generating units of CHPP-2 have been installed. In June 2020, the foundations of the flyover for engineering utilities and of the pumps were built, and the installation of technological pipelines was started. The main pumps of the system were installed in July. In August 2020, the storage tank was filled with a heat-transfer agent and the tank was hydrostatically tested. In September, the construction of technological pipelines was completed and the construction of the thermal insulation of the storage tank was started. At the end of September 2020, it is planned to complete the pipeline connections to the main system pumps.

The heat storage system makes it possible to separate generation of heat and electricity, thus increasing flexibility of operations of CHPP-2 and the possibilities to better adapt operating modes in accordance with changes in electricity market conditions.

The construction works will continue until the beginning of December 2020. Adjustment and testing of the heat storage system was planned for the end of October 2020, but deliveries of equipment from European manufacturers intended for the construction of the storage system have been delayed due to the spread of Covid-19. Therefore, the adjustment and testing of the heat storage system was moved to December 2020 – January 2021. The CHPP-2 heat storage system is planned to be put into operation in February 2020.

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