Polskie Sieci Elektroenergetyczne S.A.

Polskie Sieci Elektroenergetyczne S.A. (PSE) is the state-owned transmission system operator (TSO) responsible for power transmission and grid security in Poland. The company owns and operates over 15,000 kilometers of high-voltage overhead transmission lines and 109 extra-high voltage electrical substations across the national power grid. PSE ensures continuous electricity supply stability, balances the national power system, and manages cross-border energy exchanges with neighboring transmission system operators in Germany, the Czech Republic, Slovakia, Lithuania, and Ukraine. As the operator of the Polish balancing market and Energy Market Information Operator (OIRE), PSE manages market settlement mechanisms and data infrastructure for energy system participants. The utility handles high-voltage grid connection applications for power plant generators, distribution network operators, and major industrial electricity consumers. PSE conducts ongoing transmission infrastructure modernizations, power system development projects, and technical integration of onshore and offshore wind energy and solar photovoltaic power sources. Headquartered in Konstancin-Jeziorna, PSE operates regional divisions in Bydgoszcz, Katowice, Poznan, Radom, and Warsaw.