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 is currently the largest producer of renewable power in the U.S. It produced ar 6.14% of the nation's total electricity in 2015 which was 45.71% of the total renewable power in the U.S. The United States is the fourth largest producer of hydroelectricity in the world after China, Canada and Brazil.