There's a healthy power market - so the providers can and should work out a way for their clients to exit their contract and for them to sell the electricity elsewhere.

Sure the client might be liable for some loss-of-earnings fees but this really should be better for everyone than this.

Sure, but also take into account that a mining operation large enough to enter into electricity contracts probably has other obligations like facilities and staff. Overall it may not be worth the hassle to shutdown for what could be interpreted as typical exchange rate fluctuations.