Polskie Sieci Elektroenergetyczne
Polskie Sieci Elektroenergetyczne S.A. (abbreviated PSE) is an electricity transmission system operator in Poland and the sole operator of the country's high-voltage transmission lines. It is 100% owned by the State Treasury. Until 2007, PSE was a part of the PSE Group (now: Polska Grupa Energetyczna). References

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Electric power transmission system operators in Poland
Energy in Poland