Onshore Power Supply (OPS) is part of the solution to greening the shipping sector. It is an important tool for reducing CO2 emissions and air pollution at berth and in ports. The greening of the shipping sector is a priority and ports want help to facilitate this process. Many ports in Europe are therefore stepping up their efforts to deploy more OPS and want (and need) to invest in OPS where it makes most sense. An ambitious OPS deployment plan entails large investments up front and significant operational costs. These costs cannot be borne by ports alone, making public funding a precondition for a successful deployment of OPS.