As recently as 2015, solar panel efficiency hovered around 18 %, but last year the National Renewable Energy Lab (NREL) clocked it at nearly 30 %. (powermag.com)
«Average panel efficiency is now 17 % -21 %, while previously, it was closer to 16 % -17 % efficiency.» (earth911.com)
The study also does not account for increasing solar panel efficiency over time, something that is likely to reduce the amount of land needed to generate a megawatt of solar electricity. (climatecentral.org)