The transition to proof of stake occurred in September [1].
[1] https://techcrunch.com/2022/09/15/ethereum-switches-to-proof...
[1] https://techcrunch.com/2022/09/15/ethereum-switches-to-proof...
Definitely a big leap forward in terms of reducing energy use.
[1] https://eips.ethereum.org/EIPS/eip-4895
[2] https://fortune.com/crypto/2022/12/01/when-will-ethereum-sta...
https://cointelegraph.com/news/ether-staking-withdrawal-sche...
Perhaps I'm wrong and it's all been sorted out now. As a die-hard crypto sceptic I'm not always the best informed, but I am happy that the energy usage has been addressed.