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Flattening the Duck Curve Using Grid-friendly Solar Panel Orientation

By adopting grid-scale solar power, a utility can reduce both its carbon footprint and its fuel bills for legacy thermal generation plants. However, as solar penetration increases, generation can exceed load during the middle of the day, and diurnal variations in solar generation cause rapid ramps every morning and evening. This so-called 'duck-curve' causes increased wear and tear of thermal plants and wasteful curtailment. We study how flexibility in solar panel orientation at the time of installation can be used to flatten the duck curve mitigating these ramping problems. We find that grid-friendly panel orientation can indeed reduce ramping by 25-30%, also reducing overgeneration during mid-day periods, without significantly increasing net load. Thus, it is an attractive approach for future solar deployments.