Swanson's law

Swanson's law is the observation that the price of solar photovoltaic modules tends to drop 20 percent for every doubling of cumulative shipped volume.

[3] It is named after Richard Swanson, the founder of SunPower Corporation, a solar panel manufacturer.

[4] The term Swanson's Law appears to have originated with an article in The Economist published in late 2012.

It was first developed and applied to the aeronautics industry in 1936 by Theodore Paul Wright.

[5][6][10] Plotting the module price (in $/Wp) versus time shows a dropping by 10% per year.

Swanson's law–stating that solar module prices have dropped about 20% for each doubling of installed capacity—defines the " learning rate " of solar photovoltaics . [ 1 ] [ 2 ]