What do you think ? what would my inverter say? how would I value it and how do the rest of us value it? we are talking standard energy delivery not physics, what unit does the world use to measure generation and consumption of power?
This is O-level physics; look at any electricity meter: kWh.
Watts are
by definition Joules per second, i.e. energy/time. Hence kWh is energy/time*time => energy.
In the context of power systems, energy/kWh indicates how
much useful work you can do whereas power/kW indicates how
fast you can do it.
If you like analogies, in the context of cars kW indicates how
fast you can go, kWh indicates how
far you can go.