It's called hard money (that which takes energy to produce) as opposed to soft money where all you do is turn on the printing press.

Human and electrical energy is needed to produce hard money. And, BTC is much more than money. It's a long-term store of bits of data that value has been assigned to. And, millions of people agree that it has value. Its not fiat, its not centralized, its not hackable. Its integrity is validated by thousands of miners daily. It's the way of the future. In the final analysis what's more valuable than energy??