Logo of the U.S. <a href="https://en.wikipedia.org/wiki/Architect_of_the_Capitol" class="extiw" title="en:Architect of the Capitol">Architect of the Capitol</a>, apparently introduced about October 2010.
U.S. Government
Extracted from PDF file available <a rel="nofollow" class="external text" href="http://www.aoc.gov/powertosave/upload/AOC_EarthDayGraphics_FactSheets_Energy.pdf">here</a>