You could turn that bitcoin directly into energy by making a payment to someone which expended some physical energy to produce a good or service.
If you have money you can get the energy (i.e. access to the battery) of someone or some thing.
Assuming you don't have access to the battery/money you probably would have to do some work (i.e. contribute to the battery) so that you can access the big battery/monetary system and hence exchange your energy with the energy from someone else (i.e. You make shoes and I make shirts, at some point in time you need a shirt and me a pair of shoes, so we exchange our energy)
Point is: battery needs to be always at the most efficient capacity.
If you have money you can get the energy (i.e. access to the battery) of someone or some thing.
Assuming you don't have access to the battery/money you probably would have to do some work (i.e. contribute to the battery) so that you can access the big battery/monetary system and hence exchange your energy with the energy from someone else (i.e. You make shoes and I make shirts, at some point in time you need a shirt and me a pair of shoes, so we exchange our energy)
Point is: battery needs to be always at the most efficient capacity.