Difference between the terms voltage generation and power generation
Three scenarios spring to mind: -

Voltage is generated by &quot;a process&quot; and the connected load takes a current as per ohms law. That current and that voltage implies a power as in volts x amps. This is the normally referred to as power generation but power is only generated if a load is connected.

There are other &quot;processes&quot; that generate a current (as in a photo-diode detector) but these tend to be used into short circuits (as per a trans-resistance amplifier) so there's not really a voltage or power involved.

Some &quot;processes&quot; directly generate &quot;power&quot; as in the far field of a transmitting antenna or the light emitted from a lamp or LED.



do we say a solar panel generates power or voltage when radiated by
sunlight?

It cannot generate power without a load but it can generate a voltage and that can produce current into the connected load.