Consumers will have to be vigilant this Wednesday, May 11. There will be times when putting on the washing machine, ironing or using the oven will be more advisable. Knowing which are the cheapest allows you to concentrate spending and save on the bill at the end of the month. The average reference for the whole day in the wholesale market will be 186.84 euros per megawatt hour, according to the operator Omie. Once again, hour by hour there will be big differences.