Gross versus net output

A power plant's gross output is the electricity its generator produces; its net output is what is left for the grid after the plant's own use, such as pumps, fans, cooling and control systems. The gap is usually a few percent for a large plant and can be wider for a small one, so a rating that does not say which it means cannot be compared exactly with one that does. The IAEA's 2024 catalogue, for example, lists Holtec's SMR-300 at 366 MWe gross and 320 MWe net. This site records a rating as the developer states it and does not convert between the two.

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