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2. Federal Ministry for Economic Affairs and Energy (BMWi). Energy Data; 2018 [in German only].
3. Fraunhofer IWES/IBP. Energy transition in the heating sector 2030. Key technologies to achieve the mid- and long-term climate targets in the building sector. Agora Energiewende Study; 2017 [in German only].
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5. Expert Commission on the Energy of the Future Monitoring Process. Statement on the Sixth Monitoring Report of the Federal Government for 2016; 2018.