This Calculator should be used as an estimating tool ONLY. 1  Enter the dimensions below to calculate how many bags of concrete you need. After entering the dimensions of the pad, click on Calculate and the calculator will provide you with the amount of concrete. 2  ft in. 3  ft in.  ft in.
According to the International Renewable Energy Agency (IRENA), renewable energy employment in the United States reached 724,000 jobs in 2014, a 16 percent increase from the previous year (IRENA does not include large-scale hydropower in their estimates).
Hydroelectric power in the United States. Hydroelectric power stations in the United States are currently the largest renewable source of energy, but the second for capacity (behind Wind power in the United States). Hydroelectric power produced 35% of the total renewable electricity in the U.S. in 2015, and 6.1% of the total U.S. electricity.