I am with you up to the point of the number of PowerWalls you need. How many days is Florida in “dark conditions”. You may not have 100% sunshine all year, but a vast majorly of the year, it’s sunny. Planning a week without sunshine is a bit extreme. Also, power consumption is high for AC and heating is not a big deal in a bulk of Florida. How much AC do you need during darkness
Your point on Natural gas is very different, but in the areas I have looked at in Florida (outside KSC and Key West) for reasons unknown gas wasn’t ran underground. I have no idea why.
Is Solar perfect? Nope. Is it getting better, cheaper and is storage getting better? Yes, vastly. Battery technology has improved more in the last 20
years than in the previous 150 years
Will Solar be the champion? I don’t know. Thorium looks good, based on the little information I have seen. Fuel Cells may become viable. Natural Gas is fine. As an engineer I would think a modular approach as a strategy of risk mitigation against catastrophic grid failure. As we are now, I worry about cascading failure and collapse, either from direct or indirect attacks
FWIF -— Sunrise Florida in Broward County has natural gas infrastructure for its homes and businesses. But this is rare. For the most part Floridians must use electric stoves, which are awful. Though depending on where you buy.....You might be allowed to install a modest size propane submarine tank outside yr house. I have seen this.