"much of these costs cover nuclear and natural gas generation and long-overdue infrastructure upgrades"

Much of that was for standby gas generation to cover the reliability issues of wind and solar.  As to the Tesla powerwall, it's still far too expensive ($10K+ total w/inverter install)  to be able to recover its cost as part of a renewable energy system, and of insufficient capacity  (13.5kWh) to be able to power high demand appliances (dryer, A/C) for any sustained period of time.