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With the rapid growth of renewable energy resources, the energy trading beganto shift from centralized to distributed manner. Blockchain, as a distributedpublic ledger technology, has been widely adopted to design new energy tradingschemes. However, there are many challenging issues for blockchain-based energytrading, i.e., low efficiency, high transaction cost, security & privacyissues. To tackle with the above challenges, many solutions have been proposed.In this survey, the blockchain-based energy trading in electrical power systemis thoroughly investigated. Firstly, the challenges in blockchain-based energytrading are identified. Then, the existing energy trading schemes are studiedand classified into three categories based on their main focus: energytransaction, consensus mechanism, and system optimization. And each category ispresented in detail. Although existing schemes can meet the specific energytrading requirements, there are still many unsolved problems. Finally, thediscussion and future directions are given.

When Energy Trading meets Blockchain in Electrical Power System: The State of the Art