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9 EEJ 33 (2020-2021)
Electricity Trading via Blockchain in an Energy Community from a Data Protection Point of View

handle is hein.journals/euenj9 and id is 84 raw text is: EUROPEAN ENERGY & CLIMATE JOURNAL #31/#3 As the civilian population is no longer just a consumer, but also a producer ofrenewable energy (so-called pro- sumer), the electricity consumption data between the members need a tamper-proof and automatic billing system. The blockchain technology can be used for trading electricity in an energy community and aims at making the system smarter. It can manage the bill- ing between the members, i.e., the energy producers (e.g. power generated by a PV system), the energy consumers, and/or those involved as energy storage. The processing ofdata by means of a blockchain can be helpful, but there is an inherent conflict with questions of data protection, especially since data on the ener- gy consumption of households is considered as per- sonal data. The General Data Protection Regulation (hereafter GDPR) is the EU's most comprehensive instrument to date for protecting the personal data of its citizens. The advantage of blockchains is that data is stored on many concatenated blocks that cannot be modified after their creation, which makes manip- ulation impossible and creates trust. Thus, there is a balancing act between the protection ofpersonal data and the advantages of blockchain technology. 33

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