The Energiewende has triggered an unparalleled change in the energy sector. Within just a few years, renewable energy has ceased to be a niche technology and is now Germany's principal source of electricity. We intend to continue to drive forward this development. Renewable electricity will be the key energy source in Germany's future energy system. That means that it will also be used in the heat and transport sector to operate heat pumps and drive electric cars, for example. Climate policy and energy policy are inextricably linked. Effective climate action is inconceivable without a sustainable energy policy because the energy sector accounts for some 40 percent of Germany's greenhouse gas emissions (as at 2014). The greenhouse gas neutrality goal, which is enshrined in the Paris Agreement, underlines the necessity of gradually phasing out the combustion of fossil fuels to produce energy. The energy supply must be almost completely decarbonised by 2050 at the latest. Germany's Energiewende and the gradual restructuring of its energy supply towards more renewable energy and a higher level of energy efficiency has set the course for future development. Despite the associated structural adjustments and "learning costs" new economic opportunities have evolved and innovations have been developed. Renewable energy accounted for 32 percent of electricity demand in 2015, the majority coming from wind power (13.3 percent) and photovoltaics (6.5 percent). That makes renewables the most important source of electricity in Germany.