@meatlotion @kate Because auctions work to raise all prices to the price of the last most expensive generator that is currently in use, which is related to the relative inflexibility of energy demand. If demand is 30GW and 29GW is coming from renewables, that means the last 1GW is from gas. Why would you sell your cheap renewables for much less than the gas price in that situation (demand inflexibility means that you can only buy less renewables if you buy more gas).