Working from the very high level, since Germany started shutting down its nuclear plants in the Energiewende (started ~2011) electricity use has apparently cratered by more than 10% per capita [0]. That is evidence that something is going wrong, something so fungible dropping by 10% doesn't scream 'cheaper than the alternatives'. Especially since there isn't really any in-practice data on how expensive solar/wind farms are to maintain over a 20 year timeframe so we don't know what the costs will look like after the capital expenditure is done (hopefully very cheap, I'm not casting aspersions - just there isn't a lot of data for how grids go when they rely on these technologies).
We're still early days, so maybe you are spot on and just didn't feel like including sources, but there is not yet clarity on whether the money spent on renewables has been a true like-for-like replacement for the nuclear it replaced. The trends are big, slow moving and well underway though. The experiment in energy transitioning remains very interesting.
[0] https://en.wikipedia.org/wiki/Electricity_sector_in_Germany