Mining revenue is a share of network work
A miner’s expected share of block rewards roughly follows its share of network hashrate. Actual results are lumpy: a pool smooths payouts across miners, while solo mining can wait a very long time for a block.
Efficiency links hashrate to electricity
Two machines with the same TH/s can have different power draw. Divide watts by TH/s to compare joules per terahash. Lower is more efficient, but purchase price, repair rate, cooling and curtailment still matter.
Compare live proof-of-work context in the mining dashboard and read the mining learning path.