Comment by flawi

Except you can't just invest it all into renewables and expect to have a stable power grid, the equation isn't quite as simple as "avg_power / $ capex". Last analysis I saw of this argued that the amount of "over-provisioning" needed to cover baseline demand with renewables made them prohibitively expensive as the sole solution. Peaker and storage solutions aim to solve that, but you need to build that capacity in addition to renewables.