In the context of various road and railway projects, the Swiss Federal Department of the Environment, Transport, Energy and Communications (DETEC) is planning to bundle the development of the country’s network of high-voltage transmission lines (380/220 kV) with that of the federal network of roads and railways. While this bundling of infrastructures is expected to promote landscape conservation and more efficient land use, key engineering requirements (e.g. relating to construction, technology, maintenance, operation, and safety) needed to be worked out. EBP was commissioned to clarify the details.