A (design capacity) can be constituted-of-or-filled-with some mws.
A (nameplate capacity) can be constituted-of-or-filled-with some mw.
Thermal capacity can be constituted-of-or-filled-with some mws.
Some mws can be constituted-of-or-filled-with hydro-electricity.
Some (generator units) can be constituted-of-or-filled-with some mws.