How to Convert Megawatt to Kilowatt. 1 MW = 1000 kW. 1 kW = 0.001 MW. Example: convert 15 MW to kW: 15 MW = 15 × 1000 kW = 15000 kW. Power Consumption (Annual) = Power Usage (Watts) x Time (Hours) x 365 (Days) Example: A 1700 Watts Electric kettle runs for 1 hours daily. Calculate the energy consumption in Wh and kWh in one year. Annual power usage in Wh = 1700W x 1 Hours x 365 days= 620500 Wh / year. Annual power usage in kWh = 620500 Wh /1000 = 620.5 kWh / year. EdIpe.