Block bids and offers in electricity markets
Blocks refer to a minimum of 1 hr but blocks can be any multiple of this at different Power Qty and price rates.  So the bidding is real-time and quite complex but favours the supplier to optimize profits.

By the EPEX regulations, the minimal order size for Germany and Austria is 0.1 MW for a one hour block and the minimal price  difference  between  different  orders  is  0.1  EUR/MWh.  2*

I recall it is an example of supply and demand fluctuations and characterized by Nash equations on game theory.

Refs


1 https://www.sciencedirect.com/science/article/abs/pii/S0360544210001386#aep-keywords-id7
2* https://arxiv.org/pdf/1509.00372.pdf