The first graph (showing CAPEX = capital expenditure) is capacity, the second production. The second apparently has its origin in this Mott McDonald report, where it's clear that the cost boost arose at the EPC (engineering, procurement and construction) level. They say that the reason must be that coal power plant production is more capital and materials intensive than gas, and there were also a production bottlenecks.

_{*Lunatic*, n.
One whose delusions are out of fashion.}