According to the data from the United States Department of Energy, the average cost of photovoltaic modules in the United States in 2012 was US $ 1.15 / Wdc and the average cost in 2016 was 0.72 US $ / Wdc.
The downward trend in PV costs will continue in 2017: the average spot price of monocrystalline PV modules in the first week of January 2017 was US $ 0.72 / Wdc, and by the last week of December 2017 , The average spot price of monocrystalline silicon photovoltaic modules is 0.45 US dollars / Wdc (about 2.86 yuan / W).
