Again a power plant life expectancy is 3, maybe 4 times that. And you need to do the foundation once.

You don't replace a wind turbine over a wind turbine, you need to redo the foundations (the concrete is constantly stressed and fragilized through the years), same for a power plant (also for security purposes).

This doesn't count the concrete needed for the access roads and cables to connect everything. From the article "Lafarge also supplied 20,000 tons of Type I cement for soil stabilization of approximately 44 miles of roads".

Let's try to do the maths with a modern power plant as well. Knowing that you produce more energy than in the 70' with modern turbines and we have bigger plans as well on smaller areas.