Hydropower capacity factors trending down in the United States.

Importantly, a decreasing trend in annual CF may not necessarily mean that a hydropower plant is running less often.

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No plants in the Northwest (WA, OR, ID) show a significant trend in these metrics.

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Plants in the state of New York are associated with an increasing trend in 90th percentile of daily inflow, though not in annual maxima of daily flow.

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Results Widespread decreasing trend in hydropower capacity factors Approximately four-fifths of US hydropower plants with nameplate capacity >5 MW show a long-term decline in annual CF over the last four decades (i.e., 482 out of 610 plants studied show a negative trend in CF for the period 1980–2022) (Fig. 1a ).

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