[avip]

Let's fix some false assumptions first.

1. The cost of a solar power plant is dominated by real-estate and infrastructure.

2. Energy companies are already building large scale solar farms, and have been for over 15 years. As any non-trivial large-scale construction project, these take years to approve and execute.

3. Electricity is far from a free market. In many countries (not sure how US works wtr), there are long-term commitments from grid operators (which are commonly the state) to buy zero-carbon electricity at a set price (in short, clean energy is subsidized pretty much everywhere).