Capacity: 1.3 MW
Output: 55 GWh over 25 years, or 2.2 GWh/yr, or 0.25 MW sustained.
19% capacity factor.
Thanks, dennyabraham.
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The rated output is the nameplate capacity of a facility. That is the maximum power it's capable of delivering under ideal conditions. This applies to any generating plant: coal, oil, natural gas, nuclear, solar, wind, tidal.
https://energymag.net/nameplate-capacity-or-rated-output/
That's reduced by the capacity factor of an installation. A key difference between different generating modes is what their capacity factor is. Nuclear may run as high as 95%, whilst solar is typically rated as 20-30%. This means that the mean output, over a year, is, say, 20% of the nameplate rating.
The US EIA (Energy Information Administration) publishes data on actual achieved capacity factor for different modes:
https://www.eia.gov/todayinenergy/detail.php?id=14611
There are other aspects of generating which also vary by source:
Dispatchability: can the source be turned off, or better, on?
Response time: Nuclear and coal generation take hours to adjust output to capacity. Natural gas turbines, diesel generators, and hydroelectric turbines can respond in minutes or seconds.
Total energy delivery. A high-output, fast-reacting mode may only be able to deliver energy in short bursts, or for a short period before recharging. This is the case for virtually all energy storage modes: hydroelectric, batteries, flywheel kinetic storage. It also applies to some fuel-based methods: diesel generators and gas turbines used for peaking power may not be able to run for more than a few hours before fuel reserves are exhausted.
Maintenance and downtime: How long to scheduled (or unsheduled) maintanance tasks take? How much capacity is involved in such tasks?
Regular vs. irregular variability. Solar tends not to produce high output at night. Wind power is variable, but may provide energy at any hour. Tidal power is governed by tide tables. Any or all of these might be moderated by storage mechanisms (e.g., solar thermal energy storage, which can bank heat for hours, possibly days, and hence, "deliver solar power at night").