The energy consumption of Proof-of-Stake coins is significantly lower than the energy consumption of Proof-of-Work coins. In fact, the Ethereum Foundation has published an estimate that the Ethereum network will use approximately 99.95% less energy after it transitions to Proof-of-Stake. In Proof-of-Work consensus mechanisms, miners use their computer hardware to solve difficult computational problems that increase in difficulty even further as more miners join the network. This results in mining hardware consuming large amounts of electricity. Proof-of-Stake removes the need for participants in the consensus problems to solve these arbitrary puzzles, resulting in much lower energy consumption.