Base

Crypto needs utility | Building the best onchain experiences | CB Wallet @coinbase @base 🛡️| base[hunt, cafe,merch]  | always in search of 🍕🍷

The ethereum foundation has a decent starting point. The per transaction estimate section is relevant especially in making comparisons between current energy cost per tx estimates to Visa/MasterCard. Essentially right now the whole ETH network consumes approx 1/100 of the energy of Visa per year. Although Visa currently handles way more TPS, in theory if Ethereum reached  TPS parity, the yearly energy consumption would not significantly change. 

(Assuming I understood everything I read)

https://ethereum.org/en/energy-consumption/