CESI Selected for Feasibility Study of Fourth Estonia–Latvia Electricity Interconnection

In a significant step forward for Baltic-region energy integration and the green transition, the Latvian transmission system operator AS Augstsprieguma tīkls (AST) and the Estonian counterpart Elering AS have launched a joint feasibility study for a fourth electricity interconnection between Estonia and Latvia.

The proposed interconnection is planned as an offshore/hybrid project in the Baltic Sea between the island of Saaremaa (Estonia) and the coast of the Kurzeme region in Latvia. The project aims to increase transmission capacity between the two countries, enhance system stability and security of supply, and facilitate the integration of additional renewable energy sources (RES) in the Baltic Sea region.

“As part of the shared European journey toward decarbonization and the development of renewable energy, Latvia and Estonia are exploring the possibility of building a fourth interconnection linking the two countries through the island of Saaremaa. This decision stems from the intention to establish an energy hub on the island to connect offshore wind farms. In this context, CESI has been selected to assess the project’s technical feasibility by examining various technological alternatives and evaluating the impact of the new link on the Baltic power system,” said Valerio D’Arco, Area Manager Europe & Mediterranean at CESI Consulting.

The technical portion of the study is scheduled for completion by February 2026, while the accompanying cost-benefit analysis is expected by March 2026. The interconnection is earmarked to have a capacity of approximately 1,000 MW.

The initiative aligns with the broader ambition of the Baltic states to strengthen their electricity grid infrastructure, support renewable generation growth, and integrate more deeply into the European electricity market. By reinforcing the transmission link between Estonia and Latvia — and by creating a platform for offshore wind and other clean technologies — the project will contribute to both countries’ climate and energy security goals.

For CESI, the selection for this feasibility assignment further underscores our position as a trusted technical advisor in major cross-border energy infrastructure projects. We look forward to partnering with AST and Elering in delivering a rigorous and insightful analysis that will inform decision-making on this strategic infrastructure investment.