If you think supply and demand is going to completely stop working, then you can use your money to have a battery.

But more realistically you'll be able to pay more per watt for that short period and get as many amps as your house can handle.

I am not sure whether you are serious or not, but yo do know that only a fraction of humans can do what you are propsing rigt?

If your power gets cheaper because it's all renewables, then anyone could save up that money and use it for those situations.

But also, buying such a variable-price contract is only going to be an option. If you want a certain amount of guaranteed-price power, as an individual household, there will always be someone willing it to you.