It is expensive, almost $100 per kWh stored, plus construction costs that involve fireproofing and spacing things because lithium batteries are flammable. And a lithium battery loses capacity with every recharge, so it needs replacement every few years.
We need batteries that cost, say, $10 / kWh, are not (as) flammable, not toxic (not Pb, not NiCd), and don't degrade too fast.
With that, they can be large, heavy, have low specific charge, require high or low temperatures (within reason), etc. For a large utility-grade installation all these qualities are not hugely important. There is plenty of space under solar panels and around wind turbines anyway.
Before that, selling methane remains a very good business indeed.
Batteries in controlled env do not need to be replaced every few years.
And if we could build nuclear properly in a reasonable fast way around the globe, i would be for investing it heavily anyway i'm just not controling it in anyway and the only thing actually working is solar, wind and battery.
Low risk, broad spectrum investment (private, small companies, big, basically everyone can)