Electricity is also a cost which you can incorporate. In the first year, with the purchase of the hardware, you will not turn a profit which means more money back from the tax man!
very clever stuff...
Certainly the miners could be set up as depreciable assets, but the net tax effect will be virtually the same as just expensing it all in one year for a simple company. If you take the expense of the miners all in one year, and you don't turn a profit, you'll end up with a tax credit which can be used in future years to offset taxable revenues. I think up to 7 years in the future.