No it is not solved. Grid-scale batteries are absolutely not being mass-produced today. Let's stick to the truth here.

I would LOVE for this to be the case, however. Adding this again so that I am not lumped together with the coal thumpers.

What exists, TO BE BUILT that is, is battery farms, sure, but they are nowhere nere big enough. They are nowhere nere close enough to compensate the factor applied to wind farm energy generation. But let's hope good progress can be made in the accumulation aspect of intermittent energy production.