Europe now has so much natural gas that prices just dipped below zero

I had to pay 800 euros last month for home energy on my variable contract in Amsterdam. Insane.

Normally you run storage facilities neither all the way full nor all the way empty: you want to be able to smooth out fluctuations in supply and demand. Because of the war Europe is running gas storage near its upper limit, which means we should expect less flexibility and more price volatility: they won't want to draw them way down if we get a serious cold snap, and they have nowhere to put extra gas if it's warmer than usual. The latter happened, there's nowhere to put incoming gas, so spot prices fell below zero.

This is a better situation than the reverse. It’s fortunate the winter has been mild so far. Will be interesting if the LNG industry can keep pace and replace Russia for good.

Depends on where those ships can offload the LNG. If they were in Asia or the US Northeast, prices would not be negative. (But prices differ by significant multiples between those locations)