All projects do, including wind and solar.
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Ernst & Young (EY) has found that an average power and utility megaproject is delivered 35% over budget and two years behind schedule
Of the megaprojects surveyed, 64% were delayed and 57% were over budge. Almost three-quarters of hydropower, water, coal and nuclear infrastructure projects were over budget by 49% on average,
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https://www.offshorewind.biz/2016/12/02/offshore-wind-projec...
> And realizing ten times the current building capacity for nuclear plants
How much do we need to overbuild wind and solar?