This is just for reference.
What is power?
Power = Voltage x Current (watt)
1 Kilowatt = 1000 watts
1 Megawatt = 1000 kilowatt = 1,000,000 watts.
Energy = Power x Time (watt-hour)
This is why we usually talk of Kilowatt Hours
The kilowatt hour, also written kilowatt-hour,[1] (symbol kW·h, kW h or kWh) is a unit of energy.[2]
Energy delivered by electric companys is usually expressed and charged for in kilowatt hours.
Energy in kilowatt hours is the product of power in kilowatts multiplied by time in hours; it is not kilowatts per hour.
AC and DC...
AC... is Alternating Current (mains supply)the power in your plug sockets.
DC... is Direct Current (batteries) Mostly used in small scale RE systems.
Enough of the tech stuff.
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