Keywords: Swansons-law ja.png en The green line shows Swanson's law a 20 decrease in price for every doubling of cumulative shipped photovoltaics The blue line shows actual world wide cumulative installations vs average cell price Original source data 1977 “2013 http //www economist com/news/21566414-alternative-energy-will-no-longer-be-alternative-sunny-uplands Bloomberg New Energy Finance http //www webcitation org/6TnvcG6s3 archived 2014 based on average sales price http //www webcitation org/6QcjhW4C9 of 0 36/watt on 26 June 2014 from http //www energytrend com/ EnergyTrend com 2015 based on average sales price http //www webcitation org/6YD5su1XN of 0 30/W on 29 April 2015 from http //www energytrend com/ EnergyTrend com compare to current spot-market prices http //pv energytrend com/pricequotes html here 2014-07-13 own Delphi234 <table><tr><td>thumb SVG</td><td>thumb German</td><td>thumb English</td></tr><tr><td>thumb French</td><td>thumb Polish</td><td>thumb Chinese</td></tr></table> cc-zero Uploaded with UploadWizard Photovoltaics Learning curve |