The Merge (Ethereum)
Ethereum's September 2022 transition from Proof of Work to Proof of Stake, reducing energy consumption by ~99.95%.
The Merge (Ethereum) — The Merge was Ethereum's transition from proof-of-work (PoW) to proof-of-stake (PoS) consensus, completed on September 15, 2022. It was the most significant upgrade in Ethereum's history, eliminating mining entirely, reducing energy consumption by 99.95%, and changing ETH issuance economics. The Merge joined Ethereum's execution layer with the Beacon Chain consensus layer.
What Was The Merge?
The Merge combined Ethereum's original execution layer (processing transactions and smart contracts) with the Beacon Chain (the proof-of-stake consensus layer launched in December 2020). After The Merge, validators staking ETH replaced miners running GPUs. Block production shifted from energy-intensive computation to stake-weighted random selection.
The transition occurred without downtime and without requiring users to take any action — a remarkable engineering achievement for a network securing hundreds of billions in value.
Impact of The Merge
The Merge reduced Ethereum's energy consumption from approximately 112 TWh per year to under 0.01 TWh — comparable to a few hundred households. It also reduced ETH issuance by roughly 90%, from approximately 13,000 ETH per day (PoW) to approximately 1,600 ETH per day (PoS). Combined with EIP-1559 burns, this made ETH deflationary during periods of high usage.
The Merge and DeFi
The Merge enabled ETH staking yields (typically 3-5% APR), creating a new DeFi primitive. Liquid staking protocols like Lido and Rocket Pool allow users to earn staking rewards while maintaining liquidity. Staked ETH derivatives (stETH, rETH) have become fundamental DeFi building blocks used as collateral across lending and trading protocols.
Related Terms
Ethereum Mainnet
The primary Ethereum blockchain where all real-value transactions occur, as distinct from testnets like Sepolia or Goerli.
Read definition Chain-SpecificEIP-1559
Ethereum's 2021 fee market upgrade that introduced base fee burning and improved transaction fee predictability.
Read definition Chain-SpecificProof of History (Solana)
Solana's unique consensus innovation creating a historical record proving events occurred at specific moments, enabling parallel transaction processing.
Read definition Chain-SpecificWETH (Wrapped Ether)
An ERC-20 token wrapping ETH 1:1 to make it compatible with DeFi protocols that require the ERC-20 standard.
Read definitionFrequently Asked Questions
Common questions about The Merge (Ethereum) in cryptocurrency and DeFi.
No. The Merge changed the consensus mechanism but did not increase block capacity or throughput. Gas fees remain determined by demand for block space. Layer 2 scaling solutions (Arbitrum, Base, Optimism) address Ethereum's gas cost issue.
Yes. You can run a validator with 32 ETH or use liquid staking protocols like Lido (any amount of ETH). Staking earns approximately 3-5% APR from validator rewards and priority fees.
Ethereum mining ceased entirely at The Merge. Some miners switched to Ethereum Classic (ETC) or other PoW chains. Many repurposed GPU hardware for AI computing or sold equipment. The transition ended a multi-billion-dollar mining industry overnight.
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