The project deals with the modernisation of trolleybus infrastructure — the technology of the substation in the existing premises in the city of Hradec Králové with forced construction modifications including complete replacement of the construction wiring. The object of the construction is therefore the modernisation of the existing equipment intended for the distribution of electricity to ensure the supply of the overhead contact line network by 600 V DC in the Moravian Suburb area, Nové Hradce Králové and Malšovice.