Don't we have an oversupply of renewable energy when the sun is shining and the wind is blowing, and nowhere to store it?

I'm not too knowledgeable on the process of glass manufacturing, but I know glass takes a pretty high temperature to melt. Mega operations needed for mass manufacture might be different, but smaller scale ones usually heat things up in furnaces burning at thousands of degrees.

Not too hard to get that heat by burning fuel, but through wind power? Not sure how it'll be done.

Not dismissing it. I just really don't know.

Wind to heat is easy: just run an electric [arc] furnace. This is how most commercial steel foundries heat iron. this is how Aluminum ore is smelted (the point is the electron exchange, molten metal is a welcome side effect).

The above is why aluminum is smelted in low energy cost areas. the above is why my company runs the foundry only for the night shift - the power company gives us a discount for using power at night when they need to keep the base load power plants running even though nobody is using power, which more than makes up for the extra pay we give to for working the night shift. (Now that wind is >50% of the electric mix in my state I wonder if the shifts are changing)

In fact most high temperature is generated from electric not fuel. If you burn something to get high temperatures the process is inefficient, turning the fuel into electricity and then the electricity into heat is more efficient (look up carnot efficiency)

Frickin' lasers, perhaps?

Sometimes and someplaces. Australia regularly has negative power prices due to rooftop solar.

Recycling glass takes a bit less energy than producing new glass (and a lot less CO2 is emitted during the process).

Wait till you learn how glass is made in the first place.