Electricity bills are price intensive for bitcoin miners, but having a contract with the suppliers probably will secure more coins in expenses. Power suppliers vary, and the best tariff I'd recommend for miners is the fixed rate tariff that permits paying a similar amount of money for a specific period, regardless of the fluctuation in energy prices. Hence, talking to the company to purchase energy ahead of time for a desired period, knowing how much kwh that'll be consumed, is better than working with middlemen that add up money to electricity bills, which ends up affecting the miner's budgets.
I found a
site, though it operates in the Uk, that helps with evaluating electricity prices, and finding of cheap power providers to collaborate and work with on a desired plan, and in the list was Scottish power with a three year plan and a charge of 23.9p per Kwh (unit price) However, this plan also has its disadvantages, when relocating before the time has elapsed, you could be charged for terminating the deal.
Finally, miners can count on this method, to put an end to depending on whatever bill is issued to them, and then, build rapport with the brand in control, and bid on a favorable price.