No, they're not for 100% (it's impossible with the current technology) but in the framework of a renewable grid.

> Also if renewables are so dumb and are so problematic why were they 95% of new power generation installed in the US last year?

Solar is not dumb in some parts of the US, like California or Nevada. It's dumb in the Pacific Northwest or Minnesota.

On the other hand, offshore wind is the _only_ form of renewable energy that is at least a bit reliable due to the inherent diurnal wind patterns near the shores.