In Spain (and according to a sister comment, in Austria too, so maybe it's EU-wide) the price of every MWh is set by the last MWh that enters the market (apparently it works like an auction). The last to be sold is the most expensive, thus renewables are being priced like combined due to this rule. In fact there was some scandal in Spain I seem to remember because apparently energy companies were doing the expected according to the incentives set, which is manipulating production so that combined is always used, increasing profit by doing nothing.