I feel like projects like Nova Power Bank are really important for the further development of grid sustainability. California already had large scale solar projects decades ago and AFAIK catches on with wind as well, but to combine both properly, large scale battery plants come in handy and further demand might decrease their costs.
This is also not about productivity because cramming in more work hours into the workweek and extending it will decrease the output per time, productivity, since there’s more time at a similar weekly output now. Productivity would automate or intensify work tasks which of course creates other problems.