The question is not sufficiently specified: the answer will depend on what you are asking about.
How much generated?
How much used?
In which country/region?
Usage by individual/household/per head of population in a region?
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To calculate the 30-day cost with a rate of 13.1 cents per kilowatt-hour (kWh), you need to know the total energy consumption in kWh over that period. Multiply the total kWh used by 0.131 (which is 13.1 cents converted to dollars) to get the total cost. For example, if you used 1000 kWh in a month, the cost would be 1000 kWh × 0.131 = $131.
0.6726
1 Mwh = 1000 Kwr
New energy star models are about 470 kWh per year.
KWH