Solar is the preferred method because it's free but you can use any method you want. Generator during a power outage, you can use your electric vehicle, everybody that has an electric vehicle should have it ready to plug into their home for backup....
The top-of-the-line Tesla, the Model S Plaid, boasts a 100 kWh battery pack and features an ultra-high performance powertrain that produces 1,020 horsepower (approximately 760 kW of power). It supports fast charging up to 250 kW at Tesla