About 300 million assumed 400-watt solar panels would match the 2024 annual generation of the entire U.S. conventional hydropower fleet—not one particular dam. This is an annual-energy comparison, not a claim that solar can provide hydropower’s on-demand power.
How the estimate is calculated
The U.S. Energy Information Administration (EIA) recorded 242,896 thousand megawatt-hours (MWh) of conventional hydroelectric generation in 2024. For the solar side, the calculation uses EIA’s 2024 utility-scale solar photovoltaic capacity factor of 23.2% and assumes a panel rated at 400 watts, or 0.4 kilowatts.
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- Estimate annual energy from one assumed panel: 0.4 kW × 8,760 hours per year × 0.232 = about 0.812 MWh per year.
- Divide the hydro fleet’s annual generation by that panel output: 242,896,000 MWh ÷ 0.812 MWh per panel = about 299 million panels.
- Round the result: approximately 300 million 400-watt panels.
The hydro generation figure is from the EIA’s 2024 all-sector net-generation table; the capacity factor is from its 2024 utility-scale generator capacity-factor table. Both were published October 16, 2025, and describe U.S. data for 2024.
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There is no single standard amount of electricity produced by “a hydropower dam.” Output varies with the facility, water availability, equipment and operating pattern. Because no specific dam is named, the estimate uses the whole U.S. conventional hydropower fleet as its benchmark; it should not be read as the number needed for a typical dam.
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The 400-watt panel rating is an assumption for the arithmetic, not a claim about every panel. The 23.2% capacity factor is a U.S. utility-scale solar fleet statistic. Actual annual production depends on location and project design, so a site-specific estimate would need local solar-resource and project assumptions.
Annual energy is not the same as power or operational service
Megawatt-hours (MWh) measure energy generated over time. Megawatts (MW) measure power capacity or output at a moment. Matching a dam’s annual MWh does not mean an array has the same peak output, produces electricity at the same times, or can respond in the same way to demand. A full replacement comparison would also need to consider generation timing, dispatchability, storage, transmission, and the dam’s water and operating conditions.
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For context, EIA’s 2024 capacity table reports 122,907.1 MW of utility-scale solar PV nameplate capacity and an estimated 175,289.9 MW of total PV capacity including small-scale systems. Its 2024 generation tables report 300,634 thousand MWh of total solar PV generation and 242,896 thousand MWh of conventional hydroelectric generation. These national totals describe different fleets; they do not compare a single dam with an array designed to match it.
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| 2024 U.S. figure | Value | What it measures |
|---|---|---|
| Conventional hydroelectric generation | 242,896 thousand MWh | Annual energy, all sectors; EIA generation table |
| Total solar PV generation | 300,634 thousand MWh | Annual energy, all sectors; EIA renewable-generation table |
| Utility-scale solar PV nameplate capacity | 122,907.1 MW | Power capacity; EIA existing-capacity table |
| Estimated total PV capacity, including small-scale systems | 175,289.9 MW | Power capacity; EIA existing-capacity table |
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