Residential solar prices are certainly continuing to drop, and it doesn't take much searching to find pages of graphs and tabular data from multiple sources showing pricing trends since the late 1970s. Residential solar today appears to be less than half the cost per watt of what it was just ten years ago. It's unclear that there's a direct cause correlation with fossil fuels, though. Just naively overlaying graphs showing the oil prices over the years would suggest there isn't a strong link because oil has been far more volatile with some high peaks that don't correspond to any similar surge in solar cost.
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