Had. Now we have the "Merit Order Principle". Cheap energy (i.e. renewables) are used first but the price is determined by the most expensive energy source running. (See https://de.wikipedia.org/wiki/Merit-Order)
So if you're running a solar park you have production costs of about 5ct/kWh. But if there's also a gas plant running you get maybe 20ct/kWh. Instaprofit.
Uniform pricing creates huge windfall profits for those cheap generators too, which incentivizes more investment. I‘m not saying there‘s collusion but the incentive to keep a gas turbine in the stack is clearly given.