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).
The U.S. Energy Information Administration (EIA) estimates that an additional 19 billion kWh (or about 0.02 trillion kWh) of electricity generation was from small-scale solar photovoltaic systems in 2016.3. Major energy sources and percent shares of U.S. electricity generation at utility-scale facilities in 20161. 1  Natural gas = 33.8%. 2  Coal = 30.4%. 3  Nuclear = 19.7%. 4  Renewables (total) = 14.9%. Hydropower = 6.5%. 5  Petroleum = 0.6%. 6  Other gases = 0.3%. 7  Other nonrenewable sources = 0.3%. 8  Pumped storage hydroelectricity = -0.2%4.