The intraday market is used by direct marketers to minimise balancing energy. Automated trading in particular allows forecast deviations to be settled quickly and at optimal cost.

To minimise the risk of balancing energy, the integration of battery storage with a high capacity into direct marketing is a sensible option. Whether the investment pays off in detail is shown by the quarter-hourly simulations with historical feed-in profiles of the RE parks. The batteries then jump in with a discharge and sale to the market when the actual feed-in of the RE park is lower compared to the day-ahead schedule.

Usually, PRL Primary control power stabilises the grid frequency within 30 seconds - and SRL Secondary control reserve stabilises the grid frequency within 5 minutes, if necessary. -Marketing considered as an additional source of revenue to refinance investment costs. Batteries can be activated within fractions of a second, which makes them particularly valuable for grid operators. The speed of reaction is needed in the event of a sudden increase or decrease in frequency, when a mismatch in power generation and demand occurs. Especially in the case of grid and power plant failures, rapid weather changes or exceptional demand, the 50.2 Hertz must be maintained by the grid operators. From the operator's point of view, it is problematic that particularly large batteries will be projected from 2023 onwards, which will enter the PRL market, which is around 600 MW in size. This will inevitably lead to a decline in revenues.

New: In direct marketing practice, it is observed that sufficiently large batteries have further scope to sell green power at peak prices to the intraday market (shifting the feed-in profile) and reduce balancing energy with an individual trading strategy.