After nearly three years, the White House has begun installing solar panels on the first family's residence, a White House official confirmed last week.
The Obama administration had pledged in October 2010 to put solar panels on the White House as a sign of the president's commitment to renewable energy.
The White House official, who asked not to be identified because the installation is in process, wrote in an email the project is "a part of an energy retrofit that will improve the overall energy efficiency of the building."
At the time of the 2010 announcement, then-Energy Secretary Steven Chu and White House Council on Environmental Quality chairwoman Nancy Sutley said the administration would conduct a competitive bidding process to buy between 20 and 50 solar panels.
The officials did not identify the supplier or cost of the project, but wrote the White House "has begun installing American-made solar panels" and the initiative, "which will help demonstrate that historic buildings can incorporate solar energy and energy efficiency upgrades, is estimated to pay for itself in energy savings over the next eight years."
The retrofit also includes installing updated building controls and variable speed fans, the official added.