You can spend some of the money you'd otherwise save on electricity in those cases.
> You wouldn't be happy either if factories can't produce enough food because they would have to wait for wind or sun.
A factory shifting hours wouldn't be noticeable at all by the time the product reaches the consumer weeks later.
If the factory isn't running enough hours at all, that's not a problem caused by renewables being unpredictable. That's just bad management.
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.
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.
We could all probably do well eating a little less factory-produced food and a little more farm-produced food.