It's been very common in Europe for years. People even have individual heat pump at home. US is so much behind on new technologies
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Home geothermal /could/ be a power source, sure, but I do not believe that’s what OP intended to say when mentioning heat pumps. I’d be pretty surprised if it was becoming common in Europe to have home geothermal
A heat pump (which are more common in Europe, but they’re gaining popularity in the US) is essentially a reversible air conditioner that can take advantage of the latent energy in the air to move heat very efficiently. They’re a great invention, but they have nothing to do with producing energy
Now, that energy is coming from somewhere else (in this case, the heat of the ground beneath the house or the air outside), but that's true of electrical generators as well.