Project finance companies play a crucial role in infrastructure development by providing financing for large-scale projects such as power plants, transportation systems, and public utilities. They help to mitigate the risk involved in these projects, attract investment, and provide a structured financing solution for the project. They work with government agencies, developers, and contractors to develop a financial plan that enables the delivery of the project on time and within budget. Additionally, they also provide technical and financial expertise to support the project throughout its lifecycle, from planning to construction and operation.