We're doing a new construction in Oakland, up until this point we were planning on just hooking into the PGE grid. However researching the cost of the power walls and solar and CA incentives it might make sense to skip the PGE if possible. We don't have a complete quote from PGE yet, but we're told that what ever it would cost for a standard hook up to PGE we will have to pay an ADDITIONAL $10k to run the power underground. Due to our site/home location an overhead hook up (like the rest of the neighborhood has) wouldn't really be feasible. So realistically we are probably looking at $15k to $25k for our PGE hook up total. That buys a lot solar and powerwalls. The house has no special demand for electric (no EV charging, no air conditioning, no pool or anything exotic like that) and cooking and heat/water heating will be gas. The site faces due south and has quite a bit of room on 30k sq ft lot so we could do a solar array off of the house.
I know one function of the Powerwall is to store energy from the grid if desired. I guess we'd be looking at adding an additional power wall (over what Tesla thinks we would need) to have enough in times of shade. I would be a bit worried as I can remember a time a few years ago when Oakland got 41 days straight of rain. Maybe off the grid is not a good idea yet? For us it would have to be an all or nothing approach. Either we go PGE or Tesla. Not both.