Depending on the location, it's between 10-25%. The EIA data says it's around 25%. Wind is 35%, nuclear 92%, gas combined 58%, coal 40-50%, hydro 35-40%. As you can see, the capacity factor is not 100% for pretty much everything.
Again, it all depends on the location. The US has a pretty high capacity factor for nuclear at over 90%, but the UK has it at 60-80%. Wind farms can go over 50%.
>Capacity factor: The ratio of the electrical energy produced by a generating unit for the period of time considered to the electrical energy that could have been produced at continuous full power operation during the same period.
For solar/wind, this can literally never be 100%, or even close to it.
For Coal/Nuclear/Gas it just comes down to maintenance duration.
https://www.eia.gov/electricity/monthly/epm_table_grapher.ph...
https://www.eia.gov/electricity/monthly/epm_table_grapher.ph...
Again, it all depends on the location. The US has a pretty high capacity factor for nuclear at over 90%, but the UK has it at 60-80%. Wind farms can go over 50%.