TLDR: The credit system for solar generators/solar panels with EV use present cool opportunities for rate arbitrage but require you to pay attention to your bill. It is not as simple as set it and forget if you use a time of use plan with solar and an EV.
For those on long island my rate plan is '195' with PSEG.
Detail:
So this is interesting - I starting looking at my electric bills with filling up the Rivian. They put me on a fairly unique plan with peak, off peak, and super off peak that is good for folks with solar and an ev. The interesting thing is they are letting me exchange 'banked' credits across the rate times. Peak energy generated (3-7 pm) exchanged for super off peak (10 pm to 6 am, which is when I charge) will get me a 4x multiplier (1 kWh at 3 pm would be 4 credits in that overnight period, or 4 hours).
Surprisingly, I had a $100 bill. That was because I had 684 kWh overnight usage (super off peak) and was not paying attention to the bill. I have 766(!) of credits in off peak, so I am transferring 500 kWh to the super off peak (when I will never generate because there is no sun then) that they will give me 2x on to 1000 kWh of 'overnight' bank.
If the trend keeps up, that means I could end up having a few hundred dollars of electric bills over the year, which basically matches my rought math that I would have to pay about 20% of electric with the use of the Rivian.
The arbitrage opportunity comes in because they are giving you 2-4x credit against the evening even if that period of time is only a 40% discount from peak to super off peak. This actually makes sense because at least in this metro area (more so NYC) in the summer there is a real threat of an occasional brownout. A real blackout because of grid strain happens maybe once every 10-15 areas in the city [I am not on the city grid but I bet the grid i am on - PSEG - gives juice to the city when needed].