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Summary Solar power and coal are closely interlinked. Today, there is not one single solar panel that can be produced without coal (or even oil and gas). The coal is required as a reducing agent for silicon making and as source for heat and electricity for the industrial process required to manufacture solar panels, not only in China.
Patrick Pleul / picture alliance via Getty Images Recently shuttered coal mines around the world can have new life as solar farms, potentially adding nearly 300 gigawatts (GW) of clean energy by 2030, a first-of-its-kind analysis by researchers from Global Energy Monitor (GEM) has found.
Coal is used to make solar panels in a few different ways. First, coal is used as a raw material to produce the chemicals used in the manufacturing process. Second, coal is used to produce the solar panels themselves. The process of making solar panels requires a lot of energy, and coal is one of the most energy-dense forms of fuel.
Renewable energies like solar panels require so much coal to produce the same amount of energy that 7200-kWh would generate yearly because of its high efficiency and low cost. This allows it to frequently supply enough energy to power a home for an entire year (and even much more).
Cost per kWh shows the lifetime cost of solar electricity by dividing your net system cost by total expected energy production over 25 years. This typically ranges from 6-8 cents per kWh, compared to current grid electricity averaging 16.44 cents per kWh nationally.
Another measure of the relative cost of solar energy is its price per kilowatt-hour (kWh). Whereas the price per watt considers the solar system's size, the price per kWh shows the price of the solar system per unit of energy it produces over a given period of time. Net cost of the system / lifetime output = cost per kilowatt hour
According to studies by the U.S. Department of Energy, the all-in cost of a home solar panel system is between $2.74 to $3.30 per watt. 1,2,12 This figure includes the solar panels, the installation, and other expenses. Using these numbers, an average-sized 8-kilowatt residential solar system would cost between $21,900 – $26,400.
The price of solar panels changes depending on where you live, but the average for installation is just under $29,000 or $2.75 per watt. On the high end, we talked to a solar customer in Hawaii who spent $100,000 going solar. Dion in Nevada said their 10-kW system cost about $20,000, which is about the national average price for a 7-kW system.
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