If you go dynamic, go with Ostrom. According to
Stiftung Warentest and
Finanztip, Ostrom SimplyDynamic is the most affordable dynamic electricity tariff in Germany. Why? Because we don’t add any profit margin to the energy you use. You only pay what we pay — the electricity price, grid fees, taxes, and other costs. We finance ourselves solely through a 6 € monthly service fee.