Poland’s TSO awards 230 kV transformer contract to ABB December 9, 2016 | Europe News Poland's transmission system operator (TSO) Polskie Sieci Elektroenergetyczne S.A (PSE) has awarded a contract for 230 kV transformers to the local subsidiary of ABB Limited, ABB Sp. z o.o. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password