Fusion sounds great in theory, but even if they manage to make it viable, it'll cost billions to create even one plant, and how much power does it produce theoretically?

I mean if I put on my idealist sci fi glasses, I can see a future where we have infinite energy for free, in which case we will see a lot more energy-wasteful endeavours like vertical farms, air conditioning and cryptocurrencies. But we're not there yet, and we won't be there yet for a long time.

Energy production, also with renewables, increases year over year, but keeping right on it is energy consumption.

Examples from my own country. We're building big wind farms in the North Sea. But at the same time, Google and co are building data centers that use up a lot of their capacity already. And another thing happening at the same time is a push to reduce our dependency on natural gas for heating and cooking (because emissions and international politics / dependency on Russia). And the other push is towards electric vehicles. So thirst for electricity only goes up, probably faster than new energy sources can be built (renewable or otherwise).

This trend will continue, wouldn't be surprised if electricity consumption will double in the next decade.