What are you going do if you have forecast no wind and no solar?
Does not matter if its accurate or not you wont be able produce electricity .
Straight up the reliability is gone and we know wind has shut down over certain wind speeds we know the sun goes down everyday so just knowing you cant produce electricity does not make it reliable at all.
Its right there in what you say as being unreliable . You need it 24hrs a day and you can predicate it wont be !
