Found a good summary of imbalance cash-out prices: https://www.elexon.co.uk/wp-content/uploads/2016/10/Imbalance_Pricing_guidance_v11.0.pdf https://www.elexon.

Found a good summary of imbalance cash-out prices: https://www.elexon.co.uk/wp-content/uploads/2016/10/Imbalance_Pricing_guidance_v11.0.pdf https://www.elexon.co.uk/wp-content/uploads/2016/10/Imbalanc... The basics seems simple enough - the system was long (too much supply) during this period above and beyond what is contractually ordered between generators and electricity suppliers (eg, to consumers). Having a negative price would seem to make sense if your goal is to keep consumption balanced with generation on an open market.