Photovoltaic power plants produce electricity from sunlight  As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, is one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants, which burn fossil fuels, has increased
Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants
Twenty years ago, the cost of producing electric power at photovoltaic plants was less than 10 times the cost of producing power at traditional plants.