The cheapest solar auction to date was $13 per MWh (middle east) - so utility solar in the best regions is already very very cheap. When you add 4hr batteries, it's still competitive with CCG gas - in the $50 range.

The cost models for first generation fusion plants show ¬$400 per MWh - it will take a while for them to get to reasonable cost levels.

Recycling of mono-crystalline solar (the dominant tech today) and modern turbine blades are solved problems.