I just realized this now. This is a Berlin startup with daily variable electricity prices, right? - How are the prices in winter? - During the day in a new building with photovoltaics you basically don’t need electricity, rather in the evening. If you have an electric car, though, that’s great!
The provider is "Tibber" - they come from Norway as far as I know. The prices are even hourly variable, although you basically always see a general "load curve" on weekdays (peak in the morning and early evening). Allegedly, they pass on the stock market prices without their own markup.
I have a meter from Discovergy that sends data every few seconds.
Currently, the prices seem to depend heavily on wind energy. When there is a lot of wind, the prices drop dramatically.
Here’s a "daily profile" that fits about 90% - of course always with different prices:
You can always see the prices for one day in advance and from 1 pm also the prices for the following day.
Since I work from home, I’ve oriented my daily routine a bit accordingly - washing machine/dryer, dishwasher etc. then run planned. I use a 1.6 kW power station for my office. The unit is either charged by solar (I have 200W set up in the garden) or when the price is very low AND there is no sun on the next day.
For the new building, I have already planned a solar system with a battery storage. In winter, I plan to use this storage so that it can be charged from the grid when electricity is cheap (usually at night) in order to use it during the day. With differences up to 30 cents, this is worthwhile. Otherwise, the storage is dead capital in winter.