Diesel Engine has high load factor

Nuclear power plants are capital intensive power plants and hence it is more economic to operate them at high capacity factors (or as base load plants)

PLF of Hydal Plant - 100% or 101%

Yes, It can be used for base load plant.

Baseload plants typically run at all times through the year except in the case of repairs or scheduled maintenance. An expert panel concluded that geothermal sources could produce approximately 100 gigawatts (GW) of baseload power to the USA by mid-century, which is approximately 10% of current US generating capacity (MIT 2006).