Work has begun on the replacement of the cable line crossing the Daugava River
This year, the electricity transmission system operator AS Augstsprieguma tīkls (hereinafter – AST), in order to strengthen the security of the electricity supply, will carry out reconstruction works on three 110 kV substations in Riga; AST also will start replacing the 3.2-km-long cable line that crosses the Daugava River. In 2020, the total investment in the infrastructure of Riga’s transmission network is planned to be EUR 5 million.
This autumn, the replacement of the cable line connecting the substation “Torņakalns” with the substation “Centrālā”, which is located near the Riga Central Railway Station (hereinafter – Central Station), has been commenced. Design works have been completed; their deadlines were affected by the necessity of diverting the cable line from the reconstruction zone of the Central Station within the framework of the “Rail Baltica” project. The 3.2-km-long, high-pressure oil insulation cable (including 1.1 km in the Daugava-bed), built in 1975, is planned to be replaced with a higher-capacity polymer insulation cable, thus increasing the throughput. It is planned to invest a total of EUR 2.65 million in the replacement of the cable line, including investments of EUR 1.64 million in 2020 . The works will continue in 2021 as well.
This year, three substations will be rebuilt with EUR 1.8 million in investment, and the reconstruction of the substation “Jāņciems” will be completed, during which the transformers will be replaced with more modern and environmentally friendly ones. In turn, by investing EUR 1.2 million and EUR 0.16 million, the reconstruction of substations “Mīlgrāvis” and “Šķirotava” will be commenced. It is planned to rebuild the substation “Šķirotava” into a closed-type substation, replacing transformers and installing a gas-insulated switchgear. Reconstruction works on these two objects will be continued in 2021 as well.
The installation of new connections at the request of customers in the substation “Bolderāja II” has been completed; it is planned to perform a number of works to improve energy efficiency in substations and smaller works to replace certain line sections this year.