Solar capacity factors rose across all independent system operators in 2020, pushing the weighted U.S. average up 1.8 percentage points year over year as more than three-quarters of the states housing utility-scale solar projects experienced increases.

The 2020 weighted U.S. solar capacity factor comes in at a calculated 24.4%, based on S&P Global Commodity Insights estimates. The California ISO tops the ISO leaderboard at nearly 27%, but Utah leads the pack across state lines, with solar plants in the Beehive State averaging almost 30%. Wisconsin, meanwhile, logged the largest gains from 2019 to 2020, up an estimated 8.6 percentage points.

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Source: S&P Global

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