One of the measures to ensure Lithuania’s energy independence is the cross-border electricity connection with Poland (LitPol Link). In order to make full use of this connection (i.e. in order to avoid the application of power exchange restrictions), a new advanced 330 kV electricity transmission overhead line (OJ) Kruonis Pumped Storage Power Plant (HAE) — Alytus must be built. It is not enough to use the existing infrastructure. The new double-circuit 330 kV electricity transmission OL Kruonis HAE-Alytus will enable reliable electricity power exchanges between Lithuania and Poland, improve the reliability and energy security of the transmission network, and contribute to the integration of the Lithuanian electricity system into the European electricity system. The construction of a new line will make it technically possible to reap the benefits of the single electricity market in the European Union, will allow competitive electricity prices for end-users to develop, ensure security of electricity supply and make an important contribution to the sustainable development of the electricity sector. New technologies will ensure security and security of electricity supply. This in turn will significantly reduce the level of vulnerability of electricity supply in Lithuania, one of the main threats. One of Lithuania’s weaknesses will be mitigated, namely the lack of security of electricity supply. The improved transmission network under the project will ensure the reliability of the electricity system and optimise the functioning of the electricity market. Better integration of the electricity system with other countries’ markets will increase access to cheaper electricity and thus create benefits for consumers.