There should be some limit on how far the price varies, but it is an illusion, that electricity costs the same independent of time. For normal household applian

There should be some limit on how far the price varies, but it is an illusion, that electricity costs the same independent of time. For normal household appliances, there isn't too much flexibility - you need light, when it is dark, cook for the meals etc. But with heating and especially with electric cars, flexible costs make a lot of sense. Even more in the industry, which is the larger consumer of electricity and needs incentives, to shape there consumption on availability, as far as it makes sense. It could make sense, for a company to invest into battery storage, if it saves costs. Or alternatively pay the utility companies for providing this service.