You may get a good deal from energy providers in case of floods or when electricity consumption is low in your country, but you may not get a good deal in case of grid load, so if you find a cheap deal that lasts for several months or years, that is best. Otherwise, seasonal mining and the ability to move mining equipment every few months may be better than incurring high electricity bills. This will vary depending on the country, the size of the investment and the type of deals that can be made.