Related Links: Study Finds Big Cost Overruns on Global Dam Megaprojects The 10 Largest-Capacity Hydropower Plants A recent study on global large-dam projects by Oxford University's Saïd Business School says large-dam projects experience cost and time overruns and suffer a very low cost-benefit ratio and concludes that small-dam projects are better. However, in its argument against large dams in favor of small dams, the study provides a rationale for fossil-fuel energy plants. The International Commission on Large Dams finds the results of this study to be deeply flawed. The main weakness is its focus on time and cost overruns without