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Ethereum mining peaked around **early 2021**. During this time, Ethereum's hashrate and mining profitability saw significant increases, driven by rising Ethereum prices and increased interest in cryptocurrency mining. This period was just before Ethereum started transitioning from proof-of-work (PoW) to proof-of-stake (PoS) with the London hard fork in August 2021 and the eventual "Merge" in mid-2022.