In Texas, there are multiple websites that compares the various electric plans available in each area, which includes fixed rate plans, plans with free periods (nights, weekends), renewable, buyback, ... There was even a plan that purchased electricity at the same wholesale prices as the power companies - but that plan was discontinued when customers where hit with $9000/KWh charges during the Texas freeze.
Unfortunately, how these plans are compared can be very confusing - because the price they post on the comparison websites are based on assumptions that probably won't apply to any customers.
For example, the Free Nights plan (9PM to 9AM) lists the estimated cost at $.117/KWh. But this is based on an assumption that 45% of the electricity is during the free nights period.
With our solar panels and PowerWalls - and scheduling charging of our S and X during the Free Nights period, we are using 77% of our electricity during the free nights period - which reduces our effective cost to less than $.05/KWh!
Since we have Smart Meters in Texas, someone should provide a tool that takes the actual usage from the preceding 12 months and then calculates how much the electricity would have cost under the various plans - so customers could easily figure out which plans worked best for them.
But... The industry has no incentive to do that, and seems to prefer advertising that makes it difficult to compare the various plans for a specific home.
For anyone with solar panels and PowerWalls (or other energy storage), they should use smart meter data to compare the various plans - especially those with free periods - because it could be much cheaper than getting a fixed rate or buyback plan.