2 October 2018, Kyiv. During the working meeting with representatives of the Slovak transmission system operator (TSO) SEPS, Ukrenergo agreed on an optimal technical solution in order to increase the transfer capacity of UA-SK interconnector.
Upon the results of the meeting, the parties agreed to build a new 400 kV overhead line to connect the existing SS 400 kV Mukacheve and Velke Kapusany in a one-circuit mode with the possibility of its further upgrading into a two-circuit one in case of an increase in the volume of interstate flows.
In addition, it is planned to rehabilitate OSG 400 kV at the Mukacheve substation to replace the physically and morally worn out equipment and ensure the possibility of connecting an additional 400 kV overhead line towards SS 400 kV Velke Kapusany. In particular, within the next three or four years, it is planned to replace the existing autotransformer (AT-3) 400/220 kV (installed in 1964) at SS 400 kV Mukacheve and install an integral gas insulated switchgear with the voltage of 400 kV. Operation of the existing OHL 400 kV Mukachevo – Velke Kapusany will be continued until the commissioning of a new 400 kV overhead line due to the Ukrenergo’s action plan for the synchronisation of the Integrated Power System of Ukraine into ENTSO-E.
It should be noted that this project is included in the preliminary list of projects of mutual interest of the Energy Community (PMI projects) and is being implemented through rehabilitation of OHL 400 kV Mukacheve – Velke Kapusany. It implies an increase in the transfer capacity of UA-SK interconnector by 30%. Currently, only 400 MW of the transfer capacity is used, which does not meet the actual needs of the grid. Ukrenergo’s investments in the project will amount to about € 15 million.
“Reliable operation of UA-SK interconnector is critically important not only for the Ukrainian power system, but also for the power systems of Slovakia and Romania. Therefore, modernisation of this interstate section should take place within the minimum time period and with a minimum number of outages during the performance of works. Taking into account these circumstances and the current state of the existing OHL 400 kV Mukacheve – Velke Kapusany (commissioned in 1963), we believe that for successful and effective implementation of the project, taking into account the interests of our European partners, it would be expedient to build a new cross-border line in this direction, not to modernise the existing one,” said Oleksii Brekht, Deputy CEO and Chief Operational Director of SE NPC Ukrenergo.
The implementation of PMI projects allows Ukraine to ensure the maximum power exchange with the EU countries after synchronisation with ENTSO-E. Ukraine submitted another two projects of great importance for the Ukrainian power system to the Energy Community for consideration to obtain the status of the projects of mutual interest. Namely, construction of a 400 kV “wing” of SS 750/330 kV Prymorska with two-circuit 400 kV OHL Prymorska – Isaccea (Romania) and installation of 750/400 kV autotransformer. The implementation of the project will increase the interconnector’s capacity on the border with Romania to 1000-1200 MW after 2026. As well as the project on recommencing of the interstate OHL 750 kV Khmelnytska NPP – Rzeszow (Poland). The project is a part of the pilot project “Energy Bridge”, which envisages the expansion of the “Burshtyn Energy Island” by means of incorporating KhNPP-2 power unit, 750 kV SS Zakhidnoukrainska and the interstate electricity network of OHL 750 kV KhNPP – Rzeszow.
The final list of projects will be approved during the meeting of the Council of Ministers of the Energy Community in November 2018.