Spot prices can be very volatile and easily drop below zero. If your stores are full and you have nowhere to put gas that might be building up inside an incomin

Spot prices can be very volatile and easily drop below zero. If your stores are full and you have nowhere to put gas that might be building up inside an incoming pipeline, you'll be happy to give it away for free. But once it gets cold and people start using more gas, you might pay those $2B for the gas in the tankers off your coast to satisfy increased demand.