Bitcoin mining facilities in the United States sometimes earn more from switching off than from running. The arrangement is an ordinary feature of how electricity markets manage demand.
Grids must balance supply and demand continuously
Electricity cannot be stored in meaningful quantities on the grid itself, so generation must match consumption at every moment. Any imbalance shows up immediately as a frequency deviation.
Grid operators maintain reserves for this purpose, holding generation capacity ready to start or stop. Those reserves are expensive to keep idle.
Reducing demand achieves the same balance as increasing supply. A consumer who agrees to stop drawing power on request provides a service equivalent to a standby generator.
Demand response is a paid market product
Regional transmission organizations run programs that compensate participants for curtailing consumption when instructed. Payment covers both availability and actual reductions.
Participation requires meeting technical standards for response time, measurement and reliability. A consumer who fails to curtail when called faces penalties.
Traditional participants include industrial plants and large commercial buildings, most of which can only reduce load partially and with notice.
Mining loads are unusually flexible
A mining facility can halt essentially instantly with no damage, no material in process and no employees left idle. Restarting is equally quick.
The load is also large, uniform and located wherever power is cheapest, which is often exactly where the grid is most constrained. Those characteristics are rare in industrial consumers.
From the operator's perspective this is close to an ideal controllable load. From the miner's perspective, curtailment revenue is a second income stream from the same equipment.
The economics of stopping are straightforward
A miner compares expected mining revenue during a period against curtailment payments plus avoided electricity cost. Whichever is larger determines the decision.
During extreme price events, wholesale electricity becomes worth far more than the output any machine could produce. Stopping is then obviously correct.
Some facilities contract for power at fixed rates and effectively resell it back to the market during those periods. The machines are one part of a broader energy position.
The arrangement draws sustained criticism
Opponents argue that paying data centers to stop is a subsidy for an activity that need not exist, and that large new loads worsen the scarcity being managed.
Supporters respond that flexible demand improves grid reliability and can support investment in generation that intermittent renewables otherwise strand. Both positions describe real effects.
The debate is now a fixture of state utility proceedings across several American regions. It is a policy question about load composition rather than a technical dispute.