Considering the current source(s) of power available, determine how much energy your house uses each month. You can find this information on your monthly energy bill.
Calculate your annual usage for a year. Using this value, estimate the energy consumption for your community. The US Census Bureau is one resource you can use to estimate the number of households in your community.
You can use the following formulae for this calculation:
(monthly energy usage) × (12 months per year) = (household energy usage per year);
(yearly energy estimate for your house) × (estimated number of houses in your community) = (estimated yearly energy use for your community)
The following is an example of the above calculation:
52.8 kilowatt hours (kwh) per month × 12 months = 633.6 kwh;
633.6 kwh × 200 houses in your community = 126,720 kwh