There are a couple of reasons. The first is most homes in the UK heat themselves with gas directly instead of electricity. So we still use a lot of gas.

The second thing was the 100% part was just for one day. The renewables in our grid are increasing but mostly at the expense of coal power plants, not gas.

And the final component is the UK grid system pays every electricity producer the price of the most expensive energy producer. If 1% of the grid is gas, 100% of the grid pays gas prices. Even on this one day, there was a gas power plant running as a back up (it just wasn't used).

That last one is part of why very few UK homes have electricity based heating systems. There will never be a time when electricity costs less than gas, so gas has been the cheaper option.

Reading the article would tell you some of that (specifically that it was for 25th December).

In general the UK is now managing 40%+ renewable on a yearly basis, which is pretty good going. The big proviso is that that doesn't count the gas boilers most homes use for heating.

They're also not an exclusive list of phases either - there's lot of other ways to grieve. So as a model it's not particularly great, being neither in order nor exclusive nor inclusive.

Which is unsurprising as they weren't even invented to explain grief, but rather coming to terms with a person's own death