Energy is why we burn fossil fuels. Energy is an input to everything. So this is about less consumption, or to put it another way: a drop in income. Let's say 10% less income for you, without you getting any compensation for it in any way. Other than reduced global climate impact.

Of course, you'd have to actually destroy that 10%, if you leave it on a bank account the bank would lend it, or the government would use it, which would prevent this from having an impact.