Bitcoin's 7-day average hashrate fell to 915.8 EH/s on September 26, marking a three-week low after declining by approximately 34.86 million TH/s over the past week. Miner reserves simultaneously decreased by 1,530 BTC during the same period. The hashrate reduction is primarily attributed to mining companies redirecting computational resources toward AI contracts. Hyperscale Data has shut down its Michigan mining facility to prepare for AI operations, while hydropower shortages in Ethiopia have forced power supply cuts to local miners due to declining reservoir levels.