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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...
"Data shows the avg. 50MW PV construction project delays cost $2M. The average solar construction project is delayed by about 20% with the consequences hovering around $2M in costs."
https://percepto.co/solar-construction-delays-budget-overrun...