[dillondoyle]

Ah ok. So kWh is like the length of time of that amount of energy delivered. What's the 2 GW then, like max through put at a given moment in time? So the two examples water storage lasts a really long time but a smaller relative rate of discharge versus battery could discharge the amount stored a lot quicker?

[pouetpouet]

kWh is for energy stored in this example, the "size of the tank". kWh is analogous to toe (tonne of oil equivalent) or gallons of gas. kW is for power, that is the flow of energy (energy/s), another non SI unit is horsepower. The SI unit for energy is Joule (J), the SI unit for power is J/s. 1 Watt is 1 Joule per second.