  Traditional smart grid energy auctions cannot directly be integrated in
blockchain due to its decentralized nature. Therefore, research works are being
carried out to propose efficient decentralized auctions for energy trading.
Since, blockchain is a novel paradigm which ensures trust, but it also comes up
with a curse of high computation and communication complexity which eventually
causes resource scarcity. Therefore, there is a need to develop and encourage
development of greener and computational-friendly auctions to carry out
decentralized energy trading. In this paper, we first provide a thorough
motivation of decentralized auctions over traditional auctions. Afterwards, we
provide in-depth design requirements that can be taken into consideration while
developing such auctions. After that, we analyze technical works that have
developed blockchain based energy auctions from green perspective. Finally, we
summarize the article by providing challenges and possible future research
directions of blockchain based energy auction from green viewpoint.
