In 2022 the last Antminer S9 will be disconnected from BTC net.

Approximately in August 2022 the last Antminer S9 will be disconnected from the bitcoin network. On this date, the cost of BTC from S9 @ 0.10 / KW*h will be about 430K (@ 0.05 / KW*h ~ 215K) and the price is 250K.