Many of the environmental-performance targets of the German ‘Energiewende’ are in fact falling behind the time scale that is actually required – some of them are significantly behind schedule. Progress is largely achieved where major subsidies are provided via some form of support programme. Where there is no such support, or subsidies and incentives are small, or too small, targets are starting to be missed. One criticism is that no quantifiable targets have been drawn up in the areas of economics/efficiency and security of supply. If the current status of the ‘Energiewende’ had to be described in one sentence, it might be that Germany has probably taken on too much in too short a time. We believe there are four main limiting factors: cost, physical limits, the available time budget and political feasibility.