On the energy storage side, Tesla is more focused on building utility-scale battery systems, like the ones that California has been and continues to deploy, as opposed to Powerwalls (ie. residential & commercial systems). The market for utility-scale systems is much more established at this point, especially in places like Hawaii and California that already have a significant amount of renewable generation.
That said, the market for batteries at commercial & industrial, municipal, and institutional facilities is growing. This is because their rate structures typically include time-of-use or real-time pricing (as opposed to a flat rate at all hours), as well as demand charges where the facility pays a charge based on its peak demand. This way, these facilities can charge the systems at night (when demand and electricity prices are lowest) and discharge them in the afternoon and/or evening.... Pumped hydro systems do this, as well, and hydro plants are increasingly being utilized in the evenings to mitigate the "Duck Curve" phenomenon caused by high levels of solar generation.
All that said, the value of residential battery systems is increasing, especially in disaster prone areas (eg. Caribbean & Gulf Coast due to hurricanes, areas of California most affected by forest fires) to be a source of backup / emergency power, especially if paired with roof-top solar. Otherwise, the economics aren't there yet in most places, but it's getting close. Some utilities are implementing time-of-use or real-time pricing as an option for residential customers (in California, it's becoming the default option), but that's not common yet.
