Meaning of this graph is answering the question:
How to get the most kilometres from a given kWh electric energy?
1. put it directly in a car battery
2. turn it into hydrogen and use it in a car with a fuel cell
3. turn it into fossil fuel and drive a conventional petrol car
Clear winner: batteries.
Did batteries just beat hydrogen? Uh, no. Renewable electricity supply remains intermittent and hence needs to be buffered and hydrogen is one of the best seasonal storage options available.
Nevertheless, the graph does illustrate that IF electricity is available, it is best used directly, like for charging car batteries, hydro pumping, producing steel, turn on your washing machine, switch on your freezer for some extra degrees of cold and what not. It’s called demand management. Using renewable electricity directly is almost always preferable over storing it in chemicals. Storage of electricity in hydrogen is an application of last resort.
In the future, the weather forecast will get more interesting than today, because “money is in the air”. Expect the internet-of-things to play a prominent role in taking decisions when to consume electricity automatically.