The mission of the PRACE Research Infrastructure is to enable high impact scientific discovery and engineering research and development across all disciplines to enhance European competitiveness for the benefit of society. The paper presents the current state of the computational infrastructure, which is unique on the European level and procedures helping with the seamless access to the European HPC infrastructure: supercomputers, applications, storage. Several Polish computational grants have been called in the paper in order to present examples of the Polish domestic scientific engagement.