Capacity factor
In one line
Ratio of actual energy generated over a period to the maximum possible at nameplate capacity, expressed as a percentage.
What it means
Capacity factor is the fraction of nameplate capacity a generator actually delivers over a period. Onshore wind 2026 global average: 35–45%; offshore wind: 45–55% (better wind resource). Utility solar PV: 18–28% (no nighttime). Combined-cycle gas: 50–60%. Nuclear: 90%+. Capacity factor is the single most useful number for comparing intermittent vs. dispatchable generation economics.
Related terms
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