The Systems Analysis department and various project partners assisted the German Federal Ministry for Economic Affairs and Energy (BMWi) in designing a tender system for ground-mounted photovoltaic (PV) systems. In the course of the EEG amendment in 2014, the decision was taken to switch the determination of the subsidy amount for renewable energy-based electricity generation to a tender system by 2017. In a first step, the PV ground-mounted segment will be converted to a competitive subsidy assessment system which will replace the current administrative assessment of subsidy rates. Following substantial growth until 2012, the number of new ground-mounted systems plummeted to almost 1 gigawatt after the EEG amendment entered into force in 2013. In 2014, the number of new systems declined as the degression of remuneration rates progressed faster than the systems’ price trend. In 2015, the first calls for ground-mounted PV systems were heeded. In preparation for this step, ZSW submitted numerous recommendations to the BMWi suggesting how expansion targets could be achieved at low cost, a high level of efficiency and a sufficiently high level of competition.