What do you think is less disruptive for the environment, a 1 GW fusion machine the size of a medium-sized warehouse, or 100 square kilometers of solar panels plus a battery installation?

Renewables are cheap at the margins, but they're not economically competitive if your goal is to support a massive growth of total electrical demand (either because you're a developing country that is growing rapidly, or first-world economy which is decarbonizing and electrifying industry and transportation).