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State Construction Control Bureau commissions the Estonia-Latvia third 330 kV interconnection

The State Construction Control Bureau (BKVB) has commissioned the development project Estonia-Latvia third 330 kilovolts (kV) interconnection implemented by the Latvian electricity transmission system operator Augstsprieguma tīkls (AST).

The new line was first put into trial operation at the end of last year, from January its capacity has been accounted for in the calculations of the cross-border capacity for electricity trade and at the same time work was being done on preparing documentation for the commissioning of the project.

“I am pleased that the final stage of the project – preparation of documents for the commissioning of the line after all construction works and commissioning of the line went constructively and smoothly,” said AST board member Arnis Staltmanis. “The rest of the project was similar, despite the restrictions set by the state.”

Under the framework of the project, a 176-kilometre of 330 kV high-voltage electricity transmission line from Riga CHP-2 to the Estonian border was built in Latvia. The project also included the expansion of the Riga CHP-2 substation, while the Estonian transmission system operator Elering has constructed the part of this line in Estonia from the Latvian-Estonian border up to the new 330 kV substation Kilingi-Nōmme and a new 330 kV electricity transmission line Harku-Sindi has been built as the internal Estonian network reinforcement for safe interconnection operation.

The new line will increase the total transmission capacity of the Estonia – Latvia interconnection by at least 600 megawatts (MW). Until now, the transmission capacity of the cross-border interconnection was not sufficient to facilitate the required volume of electricity trade between Latvia and Estonia, which resulted in congestion and electricity price differences at certain hours of the day. It is planned to eliminate the transmission capacity deficit in the Estonian-Latvian cross-section by 2024 when the reconstruction work on the Valmiera – Tartu and Valmiera – Tsirguliina electricity transmission lines will be completed.

The project Third 330 kV interconnection between Estonia and Latvia is also important for the security of electricity supply and stable operation of the electricity transmission network both in Latvia and in the Baltics region as a whole.

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